my stock bike toped out 51km\h!!!
- Thread starter wackey101
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motorpsycho
Active Member
That's 31 mph.
are you running 26 inch wheels?
my bike with an 80 c.c. 2 stroke, 20 inch wheels, 24 inch tall rear tire and a 41 tooth sprocket will top out at 32 mph on flat ground. the only mod that has been done to it???
a modified stock muffler on a long exhaust pipe, a velocity stack with a high flow filter, an ngk spark plug and an 8 mm. Accell spark plug wire.
I'm running 32:1 oil-fuel ratio.
my other bike with a 50 c.c. 2 stroke, 20" wheels, 21 inch tall rear tire and a 41 tooth sprocket will just get to 30 mph. the mods done to it are a spooky tooth expansion chamber (which is tuned for low end torque), modified stock muffler, ngk plug, 8mm Accell spark plug wire and a high flow k&n air filter.
also running it at 32:1.
I weigh 150 lbs, which definitly helps.
26 inch wheels will give you more top end than 20 inch wheels (like i have).
but, 31 mph totally stock is a good start.
are you running 26 inch wheels?
my bike with an 80 c.c. 2 stroke, 20 inch wheels, 24 inch tall rear tire and a 41 tooth sprocket will top out at 32 mph on flat ground. the only mod that has been done to it???
a modified stock muffler on a long exhaust pipe, a velocity stack with a high flow filter, an ngk spark plug and an 8 mm. Accell spark plug wire.
I'm running 32:1 oil-fuel ratio.
my other bike with a 50 c.c. 2 stroke, 20" wheels, 21 inch tall rear tire and a 41 tooth sprocket will just get to 30 mph. the mods done to it are a spooky tooth expansion chamber (which is tuned for low end torque), modified stock muffler, ngk plug, 8mm Accell spark plug wire and a high flow k&n air filter.
also running it at 32:1.
I weigh 150 lbs, which definitly helps.
26 inch wheels will give you more top end than 20 inch wheels (like i have).
but, 31 mph totally stock is a good start.
Last edited:
Hey there guys,
I just got a slant 66cc, and looking forward to seeing on 28" wheels. Ok, just got to tell you guys that my 48cc skyhawk mtb on 26", 32:1,NGK,wire,Free flow filter,SBP expansion,port matched on 44T---can hit 34.8 on flat. (But, I go easy 90% of time) PS-I weigh 255...
I just got a slant 66cc, and looking forward to seeing on 28" wheels. Ok, just got to tell you guys that my 48cc skyhawk mtb on 26", 32:1,NGK,wire,Free flow filter,SBP expansion,port matched on 44T---can hit 34.8 on flat. (But, I go easy 90% of time) PS-I weigh 255...
76kmh 50:1 rear tooth unsure, 26" wheels rock solid 48 or 49cc dunno bout that yet only had it 2 weeks and cops pulled me over and told me hed clocked me at 76 on flat gnd i use 100 octane fuel and penrite oil i got it second hand and have not been told much about it. but it aint normal thats for sure all i know its done about 400 kms since new
motorpsycho
Active Member
76kmh 50:1 rear tooth unsure, 26" wheels rock solid 48 or 49cc dunno bout that yet only had it 2 weeks and cops pulled me over and told me hed clocked me at 76 on flat gnd i use 100 octane fuel and penrite oil i got it second hand and have not been told much about it. but it aint normal thats for sure all i know its done about 400 kms since new
ummm, that would be 47.22 mph.
sorry, but i'm not buying it especially because 100 octane fule is useless in one of these engines, unless you have an high compression head and/or domed piston. (which would make it very hard to start). most kits come with 44 / 41 tooth rear sprockets and to get max speed you need to drop to a much smaller rear sprocket. By dropping to a smaller rear sprocket you will lose a ton of take off power. you'd have to pedal the bike up to 15-20 mph before the motor would even start to pull it on it's own. so unless your bike is set up with a 36 or smaller tooth rear sprocket, or a shift kit i doubt that your bike would get up to 47 mph.
add in rider weight, wind resistance, tires, and all that speed robbing stuff, and i am very doubtful that it was 47 mph.
now, if this motor is not 100% stock and has a ton of mods done to it with a light weight rider on a non windy day...maybe 47 mph.
Schwinn-Locura
Member
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My bike has alot of mods, and a 36 tooth sprocket (well I'm putting on my shiftkit now). Anyway I can only get to just over 42MPH on the flat. That's mixed at 20/1.
BTW I only weight 135 lbs.
BTW I only weight 135 lbs.
nathonix
New Member
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- Apr 4, 2011
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oil mix 25:1(duplex brand oil, regular unleaded) stock 44 tooth, stock carb, so on so forth stock 48cc engine with a carb that was improperly installed at an angle so as to facilitate the small frame would run 28 on a flat with 26 inch rims, and i weigh 240lbs. downhill has hit 37.8mph
have new lighter frame, and a short fit expansion chamber, but have yet to give it a speed test, mostly out of having to work and not having everything entirely rigged up properly.
have new lighter frame, and a short fit expansion chamber, but have yet to give it a speed test, mostly out of having to work and not having everything entirely rigged up properly.
adrian101
Member
Awesome work, Mines an f80b also. stock, but I'm just breaking it in. Nice speed thou for a stocky
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