Recent content by minibikesrule

Yea on these engines the the cylinder and head is the same casting and ive got to turn it 180 degreese so i can fit a pipe. thats a good thing about these engines its eays to rotate the piston and head. as for the pipe i think im just going to make a high flow muffler cant be boatherd with...

Hi guys Went for my first ride on my bmx today. Sadly i didnt have sprockets for the right gearing but its sweet for moastly flat roads. The overall ratio is 11.7:1 with 19" wheels and a 49cc pocket rocket engine. On my short ride up the road my speedometer stopped working past 59km/h on a...

very true

was that becase it broke and wraped around the sprocket and jammed the wheel

wait dosent it smoke because some of the oil is burning? so maybe the oil dosent burn as much as the other oil and is just spat out the exhaust?. or maybe it burns but just way cleaner?

good question i have no clue. my old man had a cr480 which was ment to be 20:1 oil ratio but he got some expensive smokelss synthetic oil and then he was runing it 60:1 and that was about 12 years ago and it still runs today.

yea i get what you mean about shifting got to rev it so the sprockets work kinda like flywheels to keep it turning and shifting. some smokeless oil would proberly be better than the cheap stuff i have. i rebuilt the bearings for the jackshaft there packed with grease andthey feel like real...

yea i was wandering about bearing life im gonna rebuild them tonight and make shure their packed with grease. and im using the original deraillieur shifting shouldnt be too bad its just like riding down a hill at 70kmh and shifting and not doing it whilst accelerating. i wish we had plentyfull...

yea it had a 21 speeds and i dont have yahoo messanger sorry my gear deduction should come tomorrow. so with a gear ratios form 15:1 to 30:1 it should be better than a single gear

yea i still have it its also the clutch bell but it is 6 tooth and uses pocket rocket chain. any way heres a simple picture of the setup the black square is the motor with a 3:1 reduction. the reduction has an 11 tooth sprocket which goes to the jackshaft which has a 55 tooth sprocket so at...

oh well if it does so be it but when the engine is doing 8000RPM it is only doing 533RPM so that is considerably lower

yea

it was'nt the sprocket that screwed on there was a ring that screwed on instead so i ground it off then the sprocket lifted off. not shure what type of crank

naa trying to remove the sprocket thought it was a screw on kind turns out it was'nt

yea it kinda sucks because its at the last part of the gears so it has more torque on it than the other parts. then again the other day i ripped my vice of the bench trying to remove a bike sprocket with the chain wraped around the sprocket and then into the vice and a 3 foot piece of steel tube...