Hello everyone I'm new here and need a hand. I rebuilt a manco silver streak for my son and replaced the turd 50cc with a 5 horse Briggs fun power. I bought a brand new tsc masters of motion clutch and the thing won't engage while on the ground. Works fine on jack stands but nothing off. My gear ratio is about 5 to 1 but that shouldn't be the problem. Please help.
New clutch won't engage???
- Thread starter Jsf74
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Doc Sprocket
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5:1 could be the problem... How large are the tires?
Clutch engagement is in relation to rpm. The tire size and ratio would only effect take off speed and top speed. The rpms are maxed out but the drums do not touch the clutch. At least that's my theory. I build full size race cars normally but this kart stuff is new to me.
OzFab
Well-known member
What TS is trying to say is, if your gearing is too high, the clutch will engage but the engine doesn't have enough torque to set you in motion...
Ok, you've started well, you've done a freewheel test. Now, what happens when you try to drive it; does the engine bog down or does it just free rev? If it free revs then, correct, your clutch is not engaging but, if the engine bogs down, the clutch is engaging but, as I've already mentioned, the engine doesn't have enough torque to get you moving because your gearing is too high
Ok, you've started well, you've done a freewheel test. Now, what happens when you try to drive it; does the engine bog down or does it just free rev? If it free revs then, correct, your clutch is not engaging but, if the engine bogs down, the clutch is engaging but, as I've already mentioned, the engine doesn't have enough torque to get you moving because your gearing is too high
OzFab
Well-known member
In that case, I tend to agree with you. It may be that you ended up with a high engagement clutch. You can either exchange it or, if that's a major hassle, try stretching the spring (NOTE: this should only be done as a last resort & by someone with experience in these matters)
mckutzy
Well-known member
Maybe need some different springs, looks like some of those C shape type.
mckutzy
Well-known member
Some springs are geared to engage at a certain RPM.
ex. http://www.mfgsupply.com/gomini/gominiclutch/gominiclutchcent/gominiclutchcenthilliard.html
ex. http://www.mfgsupply.com/gomini/gominiclutch/gominiclutchcent/gominiclutchcenthilliard.html
mckutzy
Well-known member
Twas merely a suggestion.
I would also say the clutch is a problem. 5:1 is high, but with 10" tyres it shouldn't do what it is doing now. Personally I would get a lower gear ratio if it were me. More fun
Cool
OzFab
Well-known member
Great, glad you got it sorted. How's it going now?
Running real good and my son is having a blast. He just snapped the axle in half about an hour ago so we got to replace that now. No biggie it's fun getting to work with my son and teach him about dirt track racing. Kind of tuff to have him help on my dirt modified but he's starting to understand go karts. Thanks.
OzFab
Well-known member
Ok, I've seen the result a few times & I watched the little princess bend her 3/4" solid axle but, how do you snap an axle?
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