Weird output shaft/crankshaft Briggs 5hp and 3hp

A

atclarkson

New Member
#1
#1
Hey guys, new guy here with a homebuilt i just bought, and plans to build one for the missus. The bike I picked uphas a 5hp briggs with a sprocket on the engine, chained to a jackshaft with a clutch on it, then to the rear wheel via a second sprocket/chain. I quite prefer the simpler way of running a clutch on the engine to the sprocket on the wheel, but this was seems to work fine.

Couple issues.

The clutch chatters when it engages. Is there a way to fix this, or do I have to get a new clutch (it's seized on the jackshaft...)

Both engines have an output shaft I've never seen before. Its not the typical shaft with one groove in it to use a set screw, but instead it is a small gear, used on the the 3hp to run a gear reduction which i have removed and the sprocket bolts right onto this on the 5hp.

Can anyone explain this to me? Also, are there clutches made to fit these?

Thanks!
Andrew
 
A

atclarkson

New Member
#2
#2
Picture for ya's.... what is this? Is the motor no good to me to put a clutch on? I have two like this.... I'm at a loss as to what I have here.

Thanks
 
Motra

Motra

Active Member
#3
#3
You would have to get new crankshafts for those engines to use standard clutches with them or, like you said, modify them so you can drive a jackshaft mounted clutch. Clutches are only available in 5/8", 3/4" and 1" sizes.
 
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