UPDATE: It's been over 5 months since this video was posted so I would like to give an update. I continued using the twin for another 3 months after this video. Then I started to have issues with the mounts I made. They started to crack due to the extra stress and vibration. Along with the crappy 6mm studs breaking and various bolts coming loose. All of this is preventable but I didn't bother at the time. Long story short, I decommissioned the twin so I could focus on a new project. HOWEVER: There will be a new video coming soon that you may like so stay tuned for that!
Very nice work on this build! It looks really kuel!💯 Looks like a strong frame to put it in and that the key #1!Looking forward to your next build #2. Keep up the great work my friend and stay safe out there.👍
Yeah this was the video that I was looking for. Thank you for walking around your bike and pointing everything out and explaining everything. Nice modifying and fabrication of what you need to make it work. very impressive.
Love this! It makes putting a motor on a fat bike look a lot better. A little fabbing, two jackshaft brackets.. Wow, impressed on your way of explaining it. But what kind of crimp thingy you use on the carb cable? I'll check the comments.
Hey glad you like it! The throttle crimp thingy is a piece from a center pull brake caliper. Look up "bicycle brake yoke" and you'll see what I mean. Basically all it does is pull up the center of a cable spanning from both carburetors.
I mean the crimp that goes under the carb gate. The gate end of the throttle cable has a melted on barrel end. You use that end of the cable and cut it to loop over to the other carb and crimped an end on it. Thats what Im curious about.
That frame looks so good for this project almost looks like a real motorcycle can you pleeeease make one with one motor and and jack shaft to connect to the gears it’d be so fun to shift
Should u sync the pistons to each other? Like should I make sure both are bottom dead center before attaching the chain to the wheel? Or can they both move their own speed?
Its been three years, would be great to have a run down on the troubles its had and what its like when one engine gets trouble and the other doesnt. Very interested in marking ip a desigm and dling this to my own bike
Has anyone mentioned to you about how much better this would run without that chain tensioner? You really don't need it. Nice job though, now all you need is high performance parts/engines. 🏁👍✌️
Yea u have to fig out the gears better bro .I have anbull and with 44 tooth sprocket I got it up to 39 mph with just one home free mod but deff looking bad ass sweet build bud
I'm in I got two Skyhawks on the way I still got to find a jackshaft I'm kind of collaborating some of your ideas with another channels ideas I'll see what I come up with welding the frame I already know going into this I'll probably never find a frame that I'm happy with so I might as well make my own👍
I've got it to about 50MPH Even though it's too high geared. Also I have an oko carb but it's a pain in the ass to tune up here at our altitude so I didn't bother.
well it looks interesting ,would like to heard it...woud it be easy to weld the shaft an us a multiple admision for the carburatos and olso de exaust sistem li the ROTAX engine.(for ultalite planes)...just saying.
I have a video of the first start/run of the twin and another video of me riding it here on my channel. It's the same engine concept though it was on a different bicycle fame.
Yeah sort of... There's a video of one of the first rides when it was on a different frame. It's on my channel. I'm planning to make another one soon with flybys and all that good stuff.
@Samster I'm highly interested in designing my bike like yours. I already have two engines. And most of everything you explained in the video I understood. However I am not familiar with I think you called a jackshaft? And do not fully understand yet how do I link the two Drive Lines together? Some of this might be the lighting from the bright sunlight some of this might be wherever kind of camera you're using, is there some way possible for you to please email me photos to my yahoo.com email that I can try to understand it better? When I ride my bike I travel as much as 50 miles in a day just to get to Walmart and home again. And often I find myself struggling to keep up with traffic on busy road such as Highway 259. I feel like the extra engine will help me in this especially on some of the longer steeper hills. The fact that I also pull a wagon behind me for groceries also hinders me with speed and power with only one engine. I am also not sure how you compensated for the extra width of the engines for your pedals to still be able to Pedal? Perhaps when you email me photos of the Driveline system you could also explain to me even show better photos how you compensated for the pedals to turn.
@Little King Cobras Den I an answer some of your questions. I know he is using an extended pedal crank kit, and you can find those on gasbikes.net or similar sites. The same with the jackshaft, but that's a bit more technical than I know about. From what limited knowledge I have, the jackshaft is basically a method of transferring power. Hope that might help.
Matt nailed it! For Clarification about the drive: I have two short chains, one coming out of each engine. They both go to their own 10 tooth sprockets. These sprockets are on a single 5/8 X 9" keyed shaft, connecting the two together as if they where one. Meanwhile, on the same shaft is a 17 tooth sprocket that is aligned with the back wheel's sprocket. Allowing the two engines to transfer power equally to the back wheel. As for the gearing ratio, it isn't ideal for hills or stop and go traffic. It's geared much higher than the regular motorized bike setup so it's more for cruising long distances at about 30MPH. Top speed is around 45MPH with how it's setup. The engines could go more but they don't have enough power to go any faster than that. Hope this helps answer you questions and sorry for the late response!
@@samstermotorizedbikes I like your twin-engined project! However, your gear ratios are too high. Your engine has built-in gearing of 4.2:1.. Assuming you have a 10-tooth engine sprocket, gear ratio at the jackshaft is the same, since you have 10t sprockets there. Your secondary sprocket is 17t. With a 44t rear sprocket, your final drive is 4.2 x (10/10) x (44/17) = 10.98:1. Too high! If you change both your 10t jackshaft sprockets to 17t, your ratio will be 4.2 x (17/10) x (44/17) = 18.48:1! You'll have three 17t sprockets on your jackshaft, and your twin-engined bike will FLYYY!!! Be sure to hang on for dear life, Samster! Good luck.
@@MR57HEAVEN Yes I've been thinking about lowering the gearing. However, I live in an aria where things are spread out and long distance cruises are needed to go places. Preferably, I like to keep my rpm down while cruising those distances. I've found that the gearing is near equivalent to a 10/32 setup on a normal motorized bike. Normally that's too high as well but since there is double the power and torque it seems pretty good for my situation. You'd be surprised on how this thing gets up and moving! Plus the top speed is around 45mph. If I where to go somewhere in between a 10 and 17 tooth sprocket I could probably get a bit higher top speed while pulling more rpm and would have more get up and go. That would be perfect! By the way I really appreciate the time you took to do all that math!
@@samstermotorizedbikes It was my pleasure. You COULD swap to a 36t and three 17t sprockets for 4.2 x (17/10) x (36/17) = 15.12:1. That's equivalent to a normal China Girl set up with a 36t rear sprocket. Right now, it's like you have a 26t rear sprocket.
Very cool and interesting project not sure about the mounts probably should run with some rubber between mounts and would be easier to tune If u just connect it to one carb with bigger than nt I’m actually keen to build something like this
Wrong, you actually have to synchronize each carb for both engines, Need two carbs, Just maybe you'd be able to run one bigger carb if you make a proper intake manifold, Would be too involved. And rubber mounts have been proven to fail on these hi rev rattling two stroke engines, they do sell them and all have terrible reviews. ✌️
@@jdrachoclanezehvallyient1257 set the idle as low as it will go still running tune it a little higher than that with each fire in a good consistent pitch and take the filter off the carburetor and give it a little bigger spark plug gap. Standard is 6mm i went to 7.5mm.
UPDATE: It's been over 5 months since this video was posted so I would like to give an update. I continued using the twin for another 3 months after this video. Then I started to have issues with the mounts I made. They started to crack due to the extra stress and vibration. Along with the crappy 6mm studs breaking and various bolts coming loose. All of this is preventable but I didn't bother at the time. Long story short, I decommissioned the twin so I could focus on a new project. HOWEVER: There will be a new video coming soon that you may like so stay tuned for that!
Damm I would've loved to see that bike in a dirt bike version with a larger sprocket for more horse power
Wanna sell the mounting brackets you made and all the jackshaft stuff? I'll build a powerful dual engine bike with it.
@@Baldys_projects make your own easy enough & better, his failed.
@@andresm6250 more torque
@@Baldys_projects Never use another persons broken junk! You can make yourself and it will be Your own style !💯easy stuff! 👍
That clutch cable setup is amazing!
I know sometimes it's hard to explain in word's how you did it. What matters is that you did it. Good looking build 👍.
Schwinn cuise 1980 looks New new
Save time selling it's a pain. Car easy them this
Very nice work on this build! It looks really kuel!💯 Looks like a strong frame to put it in and that the key #1!Looking forward to your next build #2. Keep up the great work my friend and stay safe out there.👍
Wow! You must have an insane amount of patients. I couldn't do it, I'd have to use 4 strokes.
I had no idea he was a doctor! How many patients doe he have? 🤔
Yeah this was the video that I was looking for. Thank you for walking around your bike and pointing everything out and explaining everything. Nice modifying and fabrication of what you need to make it work. very impressive.
Excellent video. This is the kind of detailed stuff I really enjoy. Good job!
You did everything really good and simple. Great job!)
Very well information 👍🔥👌 thanks, oh the bike looks dope
That is impressive. Great job and great tutorial. Thanks. Lately, I've considered constructing a similar setup.
Absolutely beautiful:) I love building these beasts Aswell
That's cool... I have a GX7 just like that and have been wondering how two engines would look on it
Man that looks awesome I can't wait to see you ride it
Good job buddy. Cool idea
Nice build sam 👍
very cool syncing your clutch and throttle
Very...very nice brother....but on your carb carb cable you could have used a banchee carb cable they are made for 2 carbs ....but super nice bro
Very cool bike.
Love this! It makes putting a motor on a fat bike look a lot better. A little fabbing, two jackshaft brackets.. Wow, impressed on your way of explaining it.
But what kind of crimp thingy you use on the carb cable? I'll check the comments.
Hey glad you like it! The throttle crimp thingy is a piece from a center pull brake caliper. Look up "bicycle brake yoke" and you'll see what I mean. Basically all it does is pull up the center of a cable spanning from both carburetors.
I mean the crimp that goes under the carb gate. The gate end of the throttle cable has a melted on barrel end. You use that end of the cable and cut it to loop over to the other carb and crimped an end on it. Thats what Im curious about.
Neat. Try a Tommaselli choke cable splitter for the throttle.
I wish i saw this video when I was building motorized bike badass bro
That frame looks so good for this project almost looks like a real motorcycle can you pleeeease make one with one motor and and jack shaft to connect to the gears it’d be so fun to shift
Wow nice I would love to see you riding the bike
I have one of those bikes with a BT80 electric-start engine on it, and I love it.👍
You could also use a dual brake lever for the clutchs
Take the chrome screw tips off some gel pens and put them onto your throttle cable into the carb :)
Thanks, great video
What if you got a slightly larger carb and a custom intake that meets together in a Y . Single carb running your two engines
very nice!
Nice bro 🔥
Should u sync the pistons to each other? Like should I make sure both are bottom dead center before attaching the chain to the wheel? Or can they both move their own speed?
I want to know the same bro. ?
If you put the pistons on inferior point or the first up and the other down.
can you teii us how you mated the engines together?
Its been three years, would be great to have a run down on the troubles its had and what its like when one engine gets trouble and the other doesnt. Very interested in marking ip a desigm and dling this to my own bike
Sry never-ending I see the update 😢
Has anyone mentioned to you about how much better this would run without that chain tensioner? You really don't need it. Nice job though, now all you need is high performance parts/engines. 🏁👍✌️
What kind of brakes and did they stop good
Yea u have to fig out the gears better bro .I have anbull and with 44 tooth sprocket I got it up to 39 mph with just one home free mod but deff looking bad ass sweet build bud
I love the twin engines and the chrome frame, but what's the deal with that seat?! At that angle, I'm surprised the front of it isn't brown!
Nah lol the seat was temporary. I changed it shortly after the fact.
Anywhere I can buy the mounts for this? Or did you make them yourself?
How fast does she go?
New Subscriber!! Did you use two jack shafts?
Thanks! Nope, just one long one.
Hook the jack shaft to your derailer chain. Then you can shift gears.
"Or else... Oh god, I don't wanna know what happens" 🤣👍🏻
Ive dented two bike frames /improper mounting
Is there a link to that jackshaft man?
I'm in I got two Skyhawks on the way
I still got to find a jackshaft I'm kind of collaborating some of your ideas with another channels ideas I'll see what I come up with welding the frame I already know going into this I'll probably never find a frame that I'm happy with so I might as well make my own👍
I do love what is the top speed. on it, and why the nt carbs. and not the O.K.O carbs,
I've got it to about 50MPH Even though it's too high geared. Also I have an oko carb but it's a pain in the ass to tune up here at our altitude so I didn't bother.
You are can you let me know where you are ordered that engine from
well it looks interesting ,would like to heard it...woud it be easy to weld the shaft an us a multiple admision for the carburatos and olso de exaust sistem li the ROTAX engine.(for ultalite planes)...just saying.
clutch adjustment must be a pain
Yep.... Though once you get it synced it's good!
That's all good, but how does it run?
I have a video of the first start/run of the twin and another video of me riding it here on my channel. It's the same engine concept though it was on a different bicycle fame.
Are those custom mounts for the jackshaft or can they be purchased
No sadly... They're just metal bars I had laying around that I drilled out.
Did you have to use a welder during the making of this machine or is everything fastened with nuts and bolt ?
@@jordindiaz8645 Just nuts and bolts my friend! Trial and error too!
Got a riding video?
Yeah sort of... There's a video of one of the first rides when it was on a different frame. It's on my channel. I'm planning to make another one soon with flybys and all that good stuff.
How would you hook up the kill switch?
Actually I had two kill buttons. One to each engine. That way just incase I had to kill one I could do it separately.
Im still waiting for you to ride this bike
Might be possible to weld
Why does he have yhe seat vertical and not horizontal.??
Have u done upgrades to it since if so post it up man this is nasty if not do an update
Actually I should mention that there's a video coming soon about "a little upgrade". Stay tuned!
Smart
Called center pull break
Dame how much do you have into the bike?
Maybe like $350. Just for the two engine kits and jackshaft parts. Everything else I had laying around.
Make a video of u riding.its probably good on trails
How about the two engines timing?
The engines aren't connected in any way that would effect timing. Both engines have independent magnetos and CDIs.
@@samstermotorizedbikes oh its like you would attach two car to make a limo? Isn’t that kind
Use a double cable brake lever for carbs..amazon
I would rather twist a throttle instead of using a lever. Besides this works surprisingly well. I do however have a dual brake lever for the breaks.
@@samstermotorizedbikes yeah twist is better
Only 1 motor and i didnt have that bigger gear thing because it was 1 motor. 60 mph my friend.
How much for You twin engine
@Samster I'm highly interested in designing my bike like yours. I already have two engines. And most of everything you explained in the video I understood. However I am not familiar with I think you called a jackshaft? And do not fully understand yet how do I link the two Drive Lines together? Some of this might be the lighting from the bright sunlight some of this might be wherever kind of camera you're using, is there some way possible for you to please email me photos to my yahoo.com email that I can try to understand it better?
When I ride my bike I travel as much as 50 miles in a day just to get to Walmart and home again. And often I find myself struggling to keep up with traffic on busy road such as Highway 259. I feel like the extra engine will help me in this especially on some of the longer steeper hills. The fact that I also pull a wagon behind me for groceries also hinders me with speed and power with only one engine.
I am also not sure how you compensated for the extra width of the engines for your pedals to still be able to Pedal?
Perhaps when you email me photos of the Driveline system you could also explain to me even show better photos how you compensated for the pedals to turn.
@Little King Cobras Den I an answer some of your questions. I know he is using an extended pedal crank kit, and you can find those on gasbikes.net or similar sites. The same with the jackshaft, but that's a bit more technical than I know about. From what limited knowledge I have, the jackshaft is basically a method of transferring power. Hope that might help.
Matt nailed it! For Clarification about the drive: I have two short chains, one coming out of each engine. They both go to their own 10 tooth sprockets. These sprockets are on a single 5/8 X 9" keyed shaft, connecting the two together as if they where one. Meanwhile, on the same shaft is a 17 tooth sprocket that is aligned with the back wheel's sprocket. Allowing the two engines to transfer power equally to the back wheel. As for the gearing ratio, it isn't ideal for hills or stop and go traffic. It's geared much higher than the regular motorized bike setup so it's more for cruising long distances at about 30MPH. Top speed is around 45MPH with how it's setup. The engines could go more but they don't have enough power to go any faster than that. Hope this helps answer you questions and sorry for the late response!
@@samstermotorizedbikes I like your twin-engined project! However, your gear ratios are too high.
Your engine has built-in gearing of 4.2:1.. Assuming you have a 10-tooth engine sprocket, gear ratio at the jackshaft is the same, since you have 10t sprockets there. Your secondary sprocket is 17t. With a 44t rear sprocket, your final drive is 4.2 x (10/10) x (44/17) = 10.98:1. Too high!
If you change both your 10t jackshaft sprockets to 17t, your ratio will be 4.2 x (17/10) x (44/17) = 18.48:1!
You'll have three 17t sprockets on your jackshaft, and your twin-engined bike will FLYYY!!! Be sure to hang on for dear life, Samster! Good luck.
@@MR57HEAVEN Yes I've been thinking about lowering the gearing. However, I live in an aria where things are spread out and long distance cruises are needed to go places. Preferably, I like to keep my rpm down while cruising those distances. I've found that the gearing is near equivalent to a 10/32 setup on a normal motorized bike. Normally that's too high as well but since there is double the power and torque it seems pretty good for my situation. You'd be surprised on how this thing gets up and moving! Plus the top speed is around 45mph. If I where to go somewhere in between a 10 and 17 tooth sprocket I could probably get a bit higher top speed while pulling more rpm and would have more get up and go. That would be perfect! By the way I really appreciate the time you took to do all that math!
@@samstermotorizedbikes It was my pleasure. You COULD swap to a 36t and three 17t sprockets for 4.2 x (17/10) x (36/17) = 15.12:1. That's equivalent to a normal China Girl set up with a 36t rear sprocket. Right now, it's like you have a 26t rear sprocket.
Very cool and interesting project not sure about the mounts probably should run with some rubber between mounts and would be easier to tune If u just connect it to one carb with bigger than nt I’m actually keen to build something like this
Wrong, you actually have to synchronize each carb for both engines, Need two carbs, Just maybe you'd be able to run one bigger carb if you make a proper intake manifold, Would be too involved.
And rubber mounts have been proven to fail on these hi rev rattling two stroke engines, they do sell them and all have terrible reviews. ✌️
Needs 2 expansion chambers
I should i make video of mine mine is inline 3
I'd love to see it!
@@samstermotorizedbikes cannot make the video in this month, I have right knee bone cancer and i have to end my last year (9) in school. Keep up!
Do you know where I can find the jack shaft assembly by any chance ?
You got a bad ass build. So cool that I put in my music video here on brtv. Check it out
And I'm the 278th subscriber so what did I win
that's awesome but sounds like a nightmare
All I did was get a racing motor 80cc single motor 36 tooth sprocket goes 50
hay that was my ideal 1st on the gx7 hell naw you stole that from me lol
Not 80cc 66/67cc
Two cheap engines are twice as likely to break as one cheap engine.
45? Thats slow! I had a genesis frame with a fat tire single 80cc doing 60mph.
And how modded was this "60mph 80cc"
@@jdrachoclanezehvallyient1257 it was completely stock just opened all the way up. No mods just tuned.
@@jdrachoclanezehvallyient1257 set the idle as low as it will go still running tune it a little higher than that with each fire in a good consistent pitch and take the filter off the carburetor and give it a little bigger spark plug gap. Standard is 6mm i went to 7.5mm.