@@southeastvintagecyclerescue I’ll find out over the next few weeks. This bike jumped back to the top of my daily riders. I’ll be really curious to see if the added bore gives it any more giddyup.
@@EinarLerschen I’ve started it a few times and ran it thru some heat cycles. I’ve yet to ride it, other than that little trip down the street and back.
Your half-assed winging is pretty good work. It's encouraging to me to dive into a little motor work. I'm not a mechanic but i an inclined to wrench. I'd love to go on that ride in September but we are moving into a new house the week prior and I'd probably need a lawyer if i took off that weekend. 😅😅
For you saying you hadn’t ever fitted rings to a piston, you made it look like a pro. Just to mention a good idea… when removing or installing wrist pin cir-clips, putting a clean rag over the crankcase opening can prevent a clip getting “launched” into the engine !!
In case you didn’t know TB parts has a section of their site full of technical info. I’m pretty they have instructions there on how to install the big bore kit there.
@@zachsiebers5742 I’m aware, but……I’ve watched too many Mustie1 videos, over the past 15 years, and he refuses to look info up, before he works on something. Part of the fun is seeing if you can figure it out on your own. I only mentioned instructions, because I know some out there would freak out without them.
@@mikeb6431 I’m really anxious to put some miles on it and see how it does. I’ve got another adventure ahead of me and I’d like to not have any engine related issues.
Enjoyed it, Mike! I will be interested to see what the performance difference will be. The increase in compression with the domed piston might give it some extra oomph.
@@stuartappleton4178 I’ll be doing testing, over the next couple weeks, changing carbs, etc. I’ve got a little time to try and dial things in for peak performance.
I enjoyed the video, and absolutely love the ST90. Although you didn't show it, I'm assuming you did torque those head bolts. I like that you showed how easy it is to install the big bore kits on these engines.
Hope it all comes together perfectly! Started right up and ran great; you had an O-ring on the shelf, suggests that trimming the gasket was the right thing. How many.CC's now?
@@horsewnoname872 The kit says it’s 141cc now. I’m not sure the kit was intended to be used with my engine. I think on Lifan’s, they have an o-ring in that spot, that gets reused. My Zongshen didn’t have one, but I made it work…..I think! Time will tell.
Great content and entertaining narrative on these little bikes! Did you do any upgrades to the suspension on your ST? I've thought about longer travel forks and shocks to carry my 225lbs.
@@PacRat69 Thanks. I did replace the rear shocks, with some from Amazon. The front seemed fine. I’m 225 and had 50+ pounds behind me…..everything worked great and it was a comfortable ride.
@@MiniBikeMike Okay. Great. I'll look for them. Fun little bikes. I wish there was more available for the ST90's but understandable with the limited import. Thanks for your reply!
I need to rebuild my cb125s's front struts, bumping up to the 200's... As much as i love my Navi, for those speeds I gotta step up to 125cc. Might try to go. It's lovely country out there.
@@pellingt Ben’s ride will happen at a MUCH slower speed, than my Spring Ride. I’m pretty sure he’s taking the same route, that he took me on in April 2023. With a fuel stop and a very quick lunch, it took us over 5 hours to go 60 miles. It was quite the ride. I wouldn’t be going back for a second trip, if it wasn’t worth it. Come join us!
@@pellingt I’m not sure on your carb question. I did purchase a 24mm Nibbi, to try on this engine. Over the next couple weeks, I’ll be swapping some parts to try and find the peak setup.
@@PhillipWSampsonSr It’s not luck. You have to put yourself in a position to get the things you want. I’m not one to sit back and hope it happens, I make it happen.
Hi Mike I am just trying to build my first bike 😂 after watching your video I noticed I have the front brake on the wrong side will this make a big difference. Many thanks Bob
@@Shevyrabbit1 If I’m understanding correctly, you put the front forks on the opposite side from stock? The brake would still work, the routing of the cable would look different and may be too short.
Hey mike im thinking of getting a icebear champion 125 and asking if you can make a video of everything you should do out the box to make the bike reliable
@@abelqtpie9936 Those videos should already be on my channel, from when I picked up my Champion a couple years ago. “….to make the bike reliable”….. I took the emissions equipment off mine. I pulled the black plastic plug covering the air/fuel mix screw and added washers to the swingarm. That’s all you really need to make it a fun, reliable ride. Any other changes are really just personal riding experience changes.
@@lesheath6216 Correct. I misspoke. The kit with the shorter cylinder is 138cc. I bought both kits, like 4 months ago and forgot there was a 3cc difference between the two.
@@josephsaucedo8691 The oil cooler is exactly why I don’t mess with the bigger engines. I want my bikes to look as closely to stock as possible. Original bikes didn’t have oil coolers, so they’re a big eyesore, in my opinion.
@@josephsaucedo8691 I did the 190 thing, like 15 years ago. I’m aware of what an oil cooler does. I’m more into the looks of a bike, rather than the performance. All my bikes have to have the engine guard, which is hard to fit on the 190/212’s. In a nutshell, I did those engines a long time ago, I’ve moved past them.
Thanks for walking us through that process. I think she'll be solid for the 1000 mile trip. Winging it worked out pretty darn good 🤣
@@southeastvintagecyclerescue I’ll find out over the next few weeks. This bike jumped back to the top of my daily riders. I’ll be really curious to see if the added bore gives it any more giddyup.
I loved this video, thank you!
@@DavidBarbarine Thanks for watching!
It will be most interesting to see the results.
@@EinarLerschen I’ve started it a few times and ran it thru some heat cycles. I’ve yet to ride it, other than that little trip down the street and back.
kick starting with the hey dudes on 💪.
@@lloydlacross1358 It was “comfy day” at the shop. 🤣🤣
Thanks going to do it properly and turn it around 😂
Your half-assed winging is pretty good work. It's encouraging to me to dive into a little motor work. I'm not a mechanic but i an inclined to wrench.
I'd love to go on that ride in September but we are moving into a new house the week prior and I'd probably need a lawyer if i took off that weekend. 😅😅
@@neilmoore7805 Thanks! They’re just minibikes, jump in there and start turning wrenches. 👍🏻
For you saying you hadn’t ever fitted rings to a piston, you made it look like a pro. Just to mention a good idea… when removing or installing wrist pin cir-clips, putting a clean rag over the crankcase opening can prevent a clip getting “launched” into the engine !!
@@donsoule6411 👍🏻
In case you didn’t know TB parts has a section of their site full of technical info. I’m pretty they have instructions there on how to install the big bore kit there.
@@zachsiebers5742 I’m aware, but……I’ve watched too many Mustie1 videos, over the past 15 years, and he refuses to look info up, before he works on something. Part of the fun is seeing if you can figure it out on your own. I only mentioned instructions, because I know some out there would freak out without them.
piston cut outs around wrist pin one bal. with high dome 2 nd. helps control piston expansion HAPPY WRENCHEN
@@donrice8026 Thanks for watching and commenting.
Awesome video mike 👍
@@gerardkenny8408 Thanks buddy!
I like it. Just changed the head on the ruckus and had never done that either. Sadly I was missing some parts so I couldn't get it started that day
@@Smallbore2wheels Bummer. I’m not sure that this particular kit was meant for my Zongshen engine, but…..I made it work. 👍🏻
@@MiniBikeMike let's see how it holds up during the break in and testing period 😎🤙🏼
great job
@@jeffferguson899 Thanks Jeff!
Man I just bought a TB big bore kit for my Z50R! Great video!
@@linksgarage1985 Make sure you check out the TB Parts website for instructions. Don’t follow how I did it. 🤣🤣
@@MiniBikeMike fore sure man! I’ll keep you posted on how it goes 🤣
Good thing you trimmed the gasket around the o-ring, or it may have caused a gap in the gasket.
@@notagain8661 Yeah, I don’t think this kit was really meant for my Zongshen engine, but I made it work. 🤷🏻♂️
We’ll see how it does 👍🏾
@@franciscoolvera6871 I’m not expecting much of a gain, but we’ll see what happens. 😀
Love the “half assery” comment! That cracked me up! 😂😂😂
@@mikeb6431 I’m really anxious to put some miles on it and see how it does. I’ve got another adventure ahead of me and I’d like to not have any engine related issues.
Enjoyed it, Mike! I will be interested to see what the performance difference will be. The increase in compression with the domed piston might give it some extra oomph.
@@stuartappleton4178 I’ll be doing testing, over the next couple weeks, changing carbs, etc. I’ve got a little time to try and dial things in for peak performance.
Cool
@@cainbeeping8480 Hey Cain!
👍👍😎
I enjoyed the video, and absolutely love the ST90. Although you didn't show it, I'm assuming you did torque those head bolts. I like that you showed how easy it is to install the big bore kits on these engines.
@@bartgoins1782 By torquing the heads bolts, if you meant put a wrench on them and tighten until they felt tight……yep, I torqued them. 🤣
Hope it all comes together perfectly! Started right up and ran great; you had an O-ring on the shelf, suggests that trimming the gasket was the right thing. How many.CC's now?
@@horsewnoname872 The kit says it’s 141cc now. I’m not sure the kit was intended to be used with my engine. I think on Lifan’s, they have an o-ring in that spot, that gets reused. My Zongshen didn’t have one, but I made it work…..I think! Time will tell.
Great content and entertaining narrative on these little bikes! Did you do any upgrades to the suspension on your ST? I've thought about longer travel forks and shocks to carry my 225lbs.
@@PacRat69 Thanks. I did replace the rear shocks, with some from Amazon. The front seemed fine. I’m 225 and had 50+ pounds behind me…..everything worked great and it was a comfortable ride.
@@MiniBikeMike Okay. Great. I'll look for them. Fun little bikes. I wish there was more available for the ST90's but understandable with the limited import. Thanks for your reply!
I need to rebuild my cb125s's front struts, bumping up to the 200's... As much as i love my Navi, for those speeds I gotta step up to 125cc. Might try to go. It's lovely country out there.
@@pellingt Ben’s ride will happen at a MUCH slower speed, than my Spring Ride. I’m pretty sure he’s taking the same route, that he took me on in April 2023. With a fuel stop and a very quick lunch, it took us over 5 hours to go 60 miles. It was quite the ride. I wouldn’t be going back for a second trip, if it wasn’t worth it. Come join us!
I have no problem with speed, just wasn't prepared last time. Tech question: with more CC, but no carb adjustment, shouldn't it be running lean now?
@@pellingt I’m not sure on your carb question. I did purchase a 24mm Nibbi, to try on this engine. Over the next couple weeks, I’ll be swapping some parts to try and find the peak setup.
Cool SL 90 bike with regular wheels not the same CT 70's wheels that I don't like it .. wish have that kind of bike of my own!!! 👍👍👍
@@PhillipWSampsonSr Plenty of ST90’s out there, just buy one.
@@MiniBikeMike it is rare model to find em since they made em short time
@@PhillipWSampsonSr They made them 3 years. There are tons of them out there, not rare at all. Heck, I’ve owned 20+ of them, over the years.
@@MiniBikeMike oh u lucky have em!!!! I'm so jealous lol
@@PhillipWSampsonSr It’s not luck. You have to put yourself in a position to get the things you want. I’m not one to sit back and hope it happens, I make it happen.
Welcome to the world of performance mini biking now you’ve sold yourself to the devil 😈 😂👍
@@davidwilliamson9162 Nope. I’ll keep the 125’s.
Lol that ride is on my birthday.
@@MAD450r2 Well, that sounds like a great reason to join. 👍🏻
It’s the day before mine 🤔
Hi Mike I am just trying to build my first bike 😂 after watching your video I noticed I have the front brake on the wrong side will this make a big difference.
Many thanks
Bob
@@Shevyrabbit1 If I’m understanding correctly, you put the front forks on the opposite side from stock? The brake would still work, the routing of the cable would look different and may be too short.
hurry up Mike, make a new video on that 57mm upgrade. Is it worth it?
@@MrPurnaras I just installed it yesterday and have started the engine twice. Give me a few days and I’ll post an update video. 😀
Hey mike im thinking of getting a icebear champion 125 and asking if you can make a video of everything you should do out the box to make the bike reliable
@@abelqtpie9936 Those videos should already be on my channel, from when I picked up my Champion a couple years ago. “….to make the bike reliable”….. I took the emissions equipment off mine. I pulled the black plastic plug covering the air/fuel mix screw and added washers to the swingarm. That’s all you really need to make it a fun, reliable ride. Any other changes are really just personal riding experience changes.
Guess I can’t go, not legal & don’t wear a helmet 🤣🤣🤣🤣🤣🤣🤣
@@Sgsl70 Come join me. Ain’t nobody gonna say anything. 😀
That kit is a 141 kit
@@lesheath6216 Correct. I misspoke. The kit with the shorter cylinder is 138cc. I bought both kits, like 4 months ago and forgot there was a 3cc difference between the two.
@@MiniBikeMikeI have the same kit on my 125 clone
@@lesheath6216 Did it add anything? More speed? More torque? Will I notice a change from the 125cc?
Should put a zs190cc in it 5 speed electric start also has kick 70mph they usually come as a kit with oil cooler and carb.💯🫡👍✌️
@@josephsaucedo8691 The oil cooler is exactly why I don’t mess with the bigger engines. I want my bikes to look as closely to stock as possible. Original bikes didn’t have oil coolers, so they’re a big eyesore, in my opinion.
@@MiniBikeMike it also keeps you oil from cooking on long rides . It's also optional 💯🫡👍✌️
@@josephsaucedo8691 I did the 190 thing, like 15 years ago. I’m aware of what an oil cooler does. I’m more into the looks of a bike, rather than the performance. All my bikes have to have the engine guard, which is hard to fit on the 190/212’s. In a nutshell, I did those engines a long time ago, I’ve moved past them.