That fork is not the only thing that is going break Ryan. Once you get a legit fork on there: Head Tube to Down Tube or Head Tube to Top Tube One of those junctions is going to fail. Gusset up the head-set/headtube area. We have already broken a frame at the head tube, and that was WITH suspension forks to absorb the peaks of dynamic brake loads. And no, they were not bottoming out. The speeds we are going are NO JOKE. Once you cross 45mph, if you ride the bike hard you will find its weaknesses WITH A QUICKNESS. We are now at the point with engine power/bike speeds where I can break a brand new aluminum frame in 2 hard laps. This is why I am working on full suspension frames based on steel. Based on steel so I can add more gussets/ re-weld cracks without the need for re-anealing and re-heat treatment (and just generally, so I can build sound frames without a requirement for heat-treat) I am going to gusset the absolute shit out of the head-tube area. Give thanks to the patron saint of two wheeled conveyance, Tell me you were wearing a helmet...
Head tube and down tube are massively oversized, there is a 2.5” long gusset on the bottom of the down tube down tube is butted too. Tube should collapse at the butt if anything
Thanks for sharing this, glad it ended with no broken bones! Good to know that strong brakes need strong forks. Looks like the pipe might have kept it from going full taco :) good thing it was mounted solid!
that could have been bad. I never did trust those rigid thin triple trees. It's nice to see that you are alright. Similar happened to me. My rear axle snapped at 45mph just after slowing down from 60mph; half of the axle fell out and the wheel started violently wobbling about a foot side to side so I took it off into the grass. That is when the wheel shot to the right and the front wheel shot to the left. It slingshotted me highside into the ground on my right side. I walked away from it.
Man glad nothing impaled you. Probably combination of vibration and overly aggressive brake platform for a triple tree that's supposed to be on a regular pedal cruiser. I have a springer fork on mine and I feel that thing twisting on regular cable disc brakes
If that's a 203mm rotor you have, that's your problem. Those forks need to be a minimum of 36mm in diameter with at least 1/8" thickness to handle those brakes. Anything less will result in the type of failure you encountered. Brakes are no joke when you have the kind of power you need for that bike, they easily put a half ton of force directly into the wall of that tube. The vibration likely didn't help a whole lot either. I have an RST CAPPA on my bike, and will increase my pot size/number before I increase my rotor size, since that's what it can handle. The amount of leverage directly correlates to the amount of force the fork sees during braking, and a 203mm rotor has extremely high leverage on that fork.
@@ryandarrah4247 definitely make sure you get a replacement that can handle those brakes now. 240 is crazy for a bike like that with 4 pot motorcycle brakes. The brakes I'm choosing for my 79cc bike are 4 pot MTB brakes with 180mm rotors, and with the brake dive, they're going to be more than enough. Two pot calipers are actually enough for my front brake, my rear needs more power though, since that's where all the weight is.
@@TheDustyShredder 208 and a 4 pot like magura mt5 were completely inadequate racing, they would begin to fade after one hard lap. Also they had maybe 1/2 the total brake power, this current set up can lift the rear wheel at high speed
@@ryandarrah4247 I have cable driven hydros right now, and haven't had any problems with fade, just overall power. I use sintered pads so they hold up to the heat better, and when I get the 4 pots, I'm going to pay more to swap the rotors out for ones with cooling fins, further reducing the likelihood of brake fade.
Motor cost how much ?? Compared to front fork cost . Next time build a proper bicycle before you put a stupid motor on it. Rev's super high but not really going that fast 😂😂 😂😂 racoon man beer can cases "super unnecessary"
Link of your build accelerating in a comparable manner? This made 15.3 at the wheel on 87 pump gas in the high desert. That’s the current confirmed record. Dyno was 3rd party, we had plenty of comparative data, built 212 4 strokes were around 12-13hp. Also show us how you steer a ports away from exhaust on stock bores. (You don’t and that ensures garbage results)
@@ryandarrah4247 and you can't take zero credit for that power but you can send a thank you letter to the folks that manufactured that cylinder. 😂😂 Seriously buy some proper forks you got super lucky THIS TIME.
@@2strokecarbtuningportingin187 If it’s all on the cylinder why are your cylinders not making this type of power? Why don’t you just get this cylinder? Also cylinder came 190-130. I switched it to 180-123.
@motorized bicycle carb tuning porting information Dude, the hobby has evolved, get over it. Do u see anyone else in the world producing these cases regularly or at all? Nobody says YOU have to run scooter cylinders but damn man, give the guy a little credit for designing and machining his own case to accept these beastly top ends and be able to bolt it right onto a bicycle. Not to mention the new style clutches and everything else these guys came up with. Stop being hateful.
Glad your ok bud, that bike rips for sure. Just time to upgrade the front forks
Dam that’s crazy bro
Always used shock absorptions for motorized bikes it helps relieve stress due to the vibrations
That fork is not the only thing that is going break Ryan.
Once you get a legit fork on there:
Head Tube to Down Tube
or
Head Tube to Top Tube
One of those junctions is going to fail.
Gusset up the head-set/headtube area.
We have already broken a frame at the head tube, and that was WITH suspension forks to absorb the peaks of dynamic brake loads.
And no, they were not bottoming out.
The speeds we are going are NO JOKE.
Once you cross 45mph, if you ride the bike hard you will find its weaknesses WITH A QUICKNESS.
We are now at the point with engine power/bike speeds where I can break a brand new aluminum frame in 2 hard laps.
This is why I am working on full suspension frames based on steel.
Based on steel so I can add more gussets/ re-weld cracks without the need for re-anealing and re-heat treatment (and just generally, so I can build sound frames without a requirement for heat-treat)
I am going to gusset the absolute shit out of the head-tube area.
Give thanks to the patron saint of two wheeled conveyance,
Tell me you were wearing a helmet...
Head tube and down tube are massively oversized, there is a 2.5” long gusset on the bottom of the down tube down tube is butted too. Tube should collapse at the butt if anything
Thanks for sharing this, glad it ended with no broken bones!
Good to know that strong brakes need strong forks.
Looks like the pipe might have kept it from going full taco :) good thing it was mounted solid!
that could have been bad. I never did trust those rigid thin triple trees. It's nice to see that you are alright. Similar happened to me. My rear axle snapped at 45mph just after slowing down from 60mph; half of the axle fell out and the wheel started violently wobbling about a foot side to side so I took it off into the grass. That is when the wheel shot to the right and the front wheel shot to the left. It slingshotted me highside into the ground on my right side. I walked away from it.
Man glad nothing impaled you. Probably combination of vibration and overly aggressive brake platform for a triple tree that's supposed to be on a regular pedal cruiser. I have a springer fork on mine and I feel that thing twisting on regular cable disc brakes
That motor beast
Mostly due to the vibrations nothing big quick fix that's the problem motorbikes deal with the most is the vibrations f**** with the frame a lot
I seen u had it posted for sale
That justifies building another one even if you can't sell it now but that gave you alot of ideas for r&d
If that's a 203mm rotor you have, that's your problem. Those forks need to be a minimum of 36mm in diameter with at least 1/8" thickness to handle those brakes. Anything less will result in the type of failure you encountered. Brakes are no joke when you have the kind of power you need for that bike, they easily put a half ton of force directly into the wall of that tube. The vibration likely didn't help a whole lot either.
I have an RST CAPPA on my bike, and will increase my pot size/number before I increase my rotor size, since that's what it can handle. The amount of leverage directly correlates to the amount of force the fork sees during braking, and a 203mm rotor has extremely high leverage on that fork.
240mm, made for racing moped. Pit bike hydraulic brake caliper with ebc pads. Yeah forks were temporary then they ended up staying
@@ryandarrah4247 definitely make sure you get a replacement that can handle those brakes now. 240 is crazy for a bike like that with 4 pot motorcycle brakes. The brakes I'm choosing for my 79cc bike are 4 pot MTB brakes with 180mm rotors, and with the brake dive, they're going to be more than enough. Two pot calipers are actually enough for my front brake, my rear needs more power though, since that's where all the weight is.
@@TheDustyShredder 208 and a 4 pot like magura mt5 were completely inadequate racing, they would begin to fade after one hard lap. Also they had maybe 1/2 the total brake power, this current set up can lift the rear wheel at high speed
@@ryandarrah4247 I have cable driven hydros right now, and haven't had any problems with fade, just overall power. I use sintered pads so they hold up to the heat better, and when I get the 4 pots, I'm going to pay more to swap the rotors out for ones with cooling fins, further reducing the likelihood of brake fade.
Yep just saw your stuff ramdomly on eBay, ggz👽
Wow that's crazy bro!!
Thanks God you wasn't racing! I like your gas tank brother; greetings from Bronx New York
Suspension fork bro i been using the same 2 rst forks on my bike for years
Damn I felt that here....back to the workshop...good luck!!
Great idea on the fuel tanks
Are those CDH Power forks? I hear and seen bad things about those forks
And then he rides it home
The bicycle frame you make it or buy it?
Damn,you were rippin.
With a bicycle chain as ur main drive ur wild man
are those moped Forks and handlebars
Looks fast I seen in action
Luckily it didn't happen at full speed and send you flying !
What forks are those?
Двигатель настроен великолепно.
Of course it broke. You drive like a pro racer 😅
💯
Front break fold it? I had that happen on the 4 stroke build going down hill once.
Because its thin ass tubing not strong enough for what it's being used for...luckily no one lost there life or serious hurt
Hopefully the buyer knows 🤣🤣🤣
Bro drop a few on rear lol
🇨🇷🇨🇷
don't sell
Motor cost how much ?? Compared to front fork cost . Next time build a proper bicycle before you put a stupid motor on it. Rev's super high but not really going that fast 😂😂 😂😂 racoon man beer can cases "super unnecessary"
Link of your build accelerating in a comparable manner?
This made 15.3 at the wheel on 87 pump gas in the high desert. That’s the current confirmed record. Dyno was 3rd party, we had plenty of comparative data, built 212 4 strokes were around 12-13hp.
Also show us how you steer a ports away from exhaust on stock bores. (You don’t and that ensures garbage results)
@@ryandarrah4247 and you can't take zero credit for that power but you can send a thank you letter to the folks that manufactured that cylinder. 😂😂 Seriously buy some proper forks you got super lucky THIS TIME.
@@2strokecarbtuningportingin187
If it’s all on the cylinder why are your cylinders not making this type of power? Why don’t you just get this cylinder? Also cylinder came 190-130. I switched it to 180-123.
@motorized bicycle carb tuning porting information
Dude, the hobby has evolved, get over it. Do u see anyone else in the world producing these cases regularly or at all? Nobody says YOU have to run scooter cylinders but damn man, give the guy a little credit for designing and machining his own case to accept these beastly top ends and be able to bolt it right onto a bicycle. Not to mention the new style clutches and everything else these guys came up with. Stop being hateful.
@@SnookTuned as far as the clutch goes super old news