Please need advice 8 hp briggs 22mm shaft pulleys to sprockets

[jezoffroadkart]

Hi there ,

I am building an off-road kart using an old briggs Ic 8 hp engine with a 22mm (7/8")shaft I have a 19mm (3/4") clutch from a lawn mower ,The rear wheels are 13".I dont want to spend fortunes so I was wondering if I could use a belt pulley wheel on the engine shaft to another pulley on a jack shaft and then have the clutch mounted on the jack shaft and chain drive to the rear wheels ? If so what size pulleys do you think I need? the clutch sprocket has 10 teeth,rear sprocket 50 (i think) The Kart is for my 8 year old ( Although I have made it to fit me!!) I would like it to be able to climb up moderate hills, mounds etc ,Top speed would be good around 25 mph .

Does the above seem like the best option? or is there a better way? Many thanks J

 

[OzFab]

For starters, your gearing is way off; with that ratio it'll have trouble moving much less climbing hills; you want more like 8:1.

As for the clutch; that system should work but it would all e a little crowded, not to mention so many moving parts that could potentially foul up.

IMO, you'd do better with a 1" clutch (yes, I know the're expensive) & a small shim

 

[Doc Sprocket]

I don't know if this will be any easier on your budget, but you could ask a local machine shop what it would cost to turn your 7/8" pto down to 3/4".