beachcruiser
Member
Try your local 1/8 mile Dragstrip. See if they will let you get a qualifing time this spring and just post your time with your set-up. Just an ideal
QuadManiac
Member
LOL.. then there have to be 'with' and 'without' pedal-assist categories.
Ah that would be a KX 125 motor strapped to a bike lol.
I meant when I HAD my 44T I could do wheelies if I rode at 15 Km/h and either hit a small bump or pulled on the handle bar and gave it gas - I found this out accidentally once lol, I was flying through the bush on some trail and hit a bump which caused me to hit the gas. As a result the bike was about to tip back over on me lol but I saved it with the rear brake.
My engine is a so called "80cc" HT that's had extensive mods done. Lately Ive actually re machined the combustion chamber to give me a slight squish band and to raise the compression to a calculated 7.8 :1. Also my homemade boost bottle have me a 7.5Km/h increase in top speed (I'm surprised it helped this much). Other future upgrades, perhaps when "santa" comes will be a new exhaust and carb.
I doubt Ill be getting the acclaimed 4k Miles on a HT, maybe 2000Km then it'll krap out on me. I don't think they last long with 8:1 - I dont know, Ill just have to find out lol.
Speaking of which, I so want to stick a 80cc 2T Dirt bike engine on a mountain bike! Power and a gear box in one small package. I might have to take a trip to the wreckers
QuadManiac
Member
Rode a friend's kid's honda CR85 2stroke over the weekend.. man, when u hit the power band even in 3rd, that front wheel lifts off the ground even with my 250 pounds on it! should be **** on wheels on a mountain bike.
5
5-7HEAVEN
Guest
I agree.
Good idea, since some bikes don't have pedals.
You could also have runs with pedal-assist and runs without pedal-assist.
Good idea, since some bikes don't have pedals.
You could also have runs with pedal-assist and runs without pedal-assist.
ZnsaneRyder
Member
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Pedal assist makes a huge difference. If I pedal hard when accelerating the engine, I can leave most cars on a takeoff from a redlight.
IMO gearing matters even more than HP for takeoff.
With, engine only, it takes me a short while to get to 30mph. My gearing is high, so engine by itself isn't that quick on a start, but once I get to 20mph, it pulls REAL hard up to 35-40. For that reason, I pedal a LOT at lower speeds, and save the engine for anything over 15 mph. I'm quick in the middle speeds, and FAST at high speeds.
A 6.5HP trike I built for a friend, only topped 30-35mph, but with the lower gears, it would take my bike on acceleration EVERY time.
I'm pretty sure many of you smaller engine guys could easily beat me on a standstill with your lower gears and higher RPM.
IMO gearing matters even more than HP for takeoff.
With, engine only, it takes me a short while to get to 30mph. My gearing is high, so engine by itself isn't that quick on a start, but once I get to 20mph, it pulls REAL hard up to 35-40. For that reason, I pedal a LOT at lower speeds, and save the engine for anything over 15 mph. I'm quick in the middle speeds, and FAST at high speeds.
A 6.5HP trike I built for a friend, only topped 30-35mph, but with the lower gears, it would take my bike on acceleration EVERY time.
I'm pretty sure many of you smaller engine guys could easily beat me on a standstill with your lower gears and higher RPM.
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M
Member 5549
Guest
My GEBE 32cc Tanaka
Is Slow on take off (without peddling) Has real good midrange powerband but after I get to 28MPH it takes about 15 more seconds to max out at 32MPH.
And thats with the stock Gear. I was thinking about buying the other 2 Gears and experimenting with it to find the best Ratio for my riding style. But I think there really is very little diferance maybe a MPH or 2 in top end, and better take off with the trail gear.
Is Slow on take off (without peddling) Has real good midrange powerband but after I get to 28MPH it takes about 15 more seconds to max out at 32MPH.
And thats with the stock Gear. I was thinking about buying the other 2 Gears and experimenting with it to find the best Ratio for my riding style. But I think there really is very little diferance maybe a MPH or 2 in top end, and better take off with the trail gear.
MotorBicycleRacing
Well-Known Member
Yamaha GT 80 and no its not mine, some guy in NJ was going to send me more/better pics but never didSpeaking of which, I so want to stick a 80cc 2T Dirt bike engine on a mountain bike! Power and a gear box in one small package. I might have to take a trip to the wreckers
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machiasmort
Active Member
DIY,
Where you at boy??? I'm in Ny. I gotz an 80 also that I upped the compression on. Pulls like the devil. I took the lower gasket (tween head and block) out. Figure I'm even over 8 to 1, probably more like 10 : 1.
Either way, put higher octane gas in it and you'll notice a huge difference! Try it nomatter what others say or you read. If you've really upped the comp. you'll notice the difference. My bike reminds me 13mph-23mph like the rm80's when I was a kid!
I blew past a brand new moped this summer!!!
Where you at boy??? I'm in Ny. I gotz an 80 also that I upped the compression on. Pulls like the devil. I took the lower gasket (tween head and block) out. Figure I'm even over 8 to 1, probably more like 10 : 1.
Either way, put higher octane gas in it and you'll notice a huge difference! Try it nomatter what others say or you read. If you've really upped the comp. you'll notice the difference. My bike reminds me 13mph-23mph like the rm80's when I was a kid!
I blew past a brand new moped this summer!!!
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