Possible engine options, plz help me decide

[SAFETYpin]

Ive recently been rekindled to my old toys. Dug out the old minibike, ive got a monkey wards/gillson machine. Its all there and original. I was having issues getting the engine to idle without the clutch grabbing but I figured out the clutch is bad.

? #1 I have the original Tecumseh H50 and would like to keep it as the original powertrain. I also have a brand new 8hp briggs, should I install the briggs or sell it for a clone?

I really like the flat head look, so I am a bit torn. The briggs would need an air filter/exhaust and some sort of governor linkage as its missing. I havent started it yet but I am fairly certain its brand new, minus a couple pieces.

Any carb issues on the briggs, I heard some carbs aren't really set up to operate at different rpm vs a fixed rpm.

I need a clutch either way right now, but the H50 has a smaller crank than the briggs, I think? Any thoughts?

The tecumseh runs just fine, should I just run that?

Not my machine but/ could be..




What would you do??

[Kenny1]

This might be out in left field, but, would it be possible to fit the shroud and air filter housing from the old engine on the new engine?

[jimh]

If the H50 runs good, that's what I'd use. They are tough, stout engines.The 8hp Briggs may be too tall. The Briggs probably has a 1" crank. You can buy clutches for these, but it may be cheaper to run from a sprocket on the crank to one on the jackshaft and put a clutch on the right side of the jackshaft,to run to the rear sprocket. I wouldn't sell either to buy a clone. The carbs designed to run at a stedy RPM will not have an idle circuit or an idle adjustment screw. A lot of sellers will try to confuse people on this to sell their goods. If you have an idle screw, you're good to go.

[SAFETYpin]

The tecumseh does seem to run well, I am a bit worried about the idle circuit in the carb. The idle mixture screw doesnt seem to be changing much of anything. I had the carb off and cleaned it up, but I must have missed a little port. I have a fluke meter with a sparkplug pick up that ill bring home from work today, that way I can really check idle rpm.

I am pretty sure the 8hp will fit as I ve seen the same bike with a 10hp, the frame looked unmolested.



I'd like to hotrod this a little without getting to wrapped up in a money game. I didnt want to hurt the original motor by removing the governor if I was dissapointed with the power/speed after a new clutch.

[jimh]

I thik he found out later that was a 8 with a 10hp shroud. The 8hp won't give you more speed, but it will get you the same speed a LOT quicker

[SAFETYpin]

Agreed, provided gearing and tire height goes unchanged.

I suppose the easiest thing to do right now is just buy a clutch for the tecumseh, if I am unhappy with it ill start forming a plan to change it than.....

[cjawcrusher512]

Who can tell me the structure of ball mill ?