DIY Pit Bike 49cc Engine

[MikeBike]

what up all you DIYrrss.

i got questions about mount a avrage pit bike engine to a 26" mt bike.

Pocket Bike Parts > Complete 49cc Engine with Transmission

theres the link,

right off hand i can think a new sprocket and a mount, i have a design in mind,

but mainly i was wondering if any of you have done this, or has dimensions of this engine. i no i am going to have to mount it higher then the pedals.

any ideas?

i really like this engine. i dont know why.

[stude13]

they are generally to wide and the pto is on the wrong side. there are many ways to use them.

[ocscully]

Originally Posted by stude13

they are generally to wide and the pto is on the wrong side. there are many ways to use them.

stude13

I agree that this set up is wide. But I don't agree that the PTO is on the wrong side. Why do you say that it is?

ocscully

[stude13]

not all are. i have a lifan lhd and i have five pocket engines which are rhd. rhd's generall need a jack shaft to apply power to lhd sprocket. is what i meant.

[MikeBike]

it looks like its on the left and the pull start it on the right

[stude13]

well, hush my mouth!

[MikeBike]

no no hushing here, i want your in put.

i was thinking about mounting it above the pedals. but do you think it would be a problem in trying to reach the pedals becuz of how ide it is?

[ocscully]

Originally Posted by MikeBike

no no hushing here, i want your in put.

i was thinking about mounting it above the pedals. but do you think it would be a problem in trying to reach the pedals becuz of how ide it is?

There are wide cranksets available from different vendors that can get the pedals out far enough to clear most set-ups. Of the kits currently available the widest are the 4-strokes that use the HondaGXH50 or its clone from china. This motor with its reduction gearbox attached measures in about 8&3/4 ins. wide. The motor and gearbox you have linked to I believe is close to 11&3/4 ins. wide. There is a new set of wide 3-piece cranks from Grubee that have a bottombracket spindle that measures 9&1/4 ins. long and then you still have the additional width added by offset crank-arms. It may provide enough width to clear the motor above.

One other area you may want to address: I believe that most Pitbike motors and the one shown above use #35 chain rather than the #41 used in most motored bike drivetrains. You may want to explore the availability of rear driven sprockets for #35 chain and how you will mount them to your rear wheel. There was a project awhile back elsewhere where someone rackmounted one of these motors and gearboxs. This person changed the output sprocket on the gearbox to one compatable with #41 chain make everything work.

[Motormaker]

The one I bought uses metric chain. 6 mm I think.

[comfortableshoes]

wide is the major issue, I have a 4stroke 49 cc cvt way to wide for the bike, but then who says you have to use the pedals....