Help keeping the chain on my sprocket

[japat100]

Steve ,
when you were talking jack shafts ,,you are getting into major construction ,thats ok if you have a machine shop and without a shop i would have gave up before i started


why don"t you look at some of the rack mounts where they use one large pulley maybe 22 inches or so that attach to the spokes ,,and a small pulley on your motor this would be simple ,,you already have the motor mounted ,,


so just buy a large pulley that hooks on spokes ,,weld a small pulley on clutch and you are ready to go ,, keep it simple ,,peddle to help get you up to 10 mph and your clutch should be ok
japat

 

[5-7HEAVEN]

Japat, this is one instance where the builder seriously underestimated what was involved in planning his project.

i've done some research, and realize that some chainsaws buzz along at 13,000rpm, probably little less under load.

using max hp at 12,500rpm for the sake of discussion, gearing of 25:1 compares with happy time engine and 61t sprocket. gearing is low(numerically high) because this engine sings at 12,500rpm, not 8,000rpm.

with a 13t sprocket welded to the engine, one rear sprocket needs to be 325 teeth.

if perchance a 9t engine sprocket can be installed, then a 225t sprocket can be used.

utilizing a 2" engine belt pulley, the rear pulley needs to 50" diameter(4' 2" tall). a 1.5" pulley needs a 37.5" pulley, a 1" pulley requires a 25" pulley.

obviously, a single pulley attachment is not going to work.

Myron

 

[MisterSteve124]

Which is why I'm just selling the chainsaw and scrapping this project.

 

[srdavo]

How about friction drive??

http://www.motoredbikes.com/showpost.php?p=52050&postcount=1

and here is one solid, good looking build----> http://www.motoredbikes.com/showthread.php?t=7150&page=2

 

[5-7HEAVEN]

Excellent suggestion, using the smallest-diameter friction roller.

Myron

 

[srdavo]

he'll just have to turn his engine 180 degrees.

 

[5-7HEAVEN]

Yeah, gear chain would've been more efficient and quicker, but this is an excellent alternative to scrapping the project.

the smallest spindle STATON has is .875". i'm ordering one for my friction-driven high-rpm pocket bike engine.

Myron