Thanks!
They are both live axles. I'm sure you are correct, but maybe you can help me understand why I have two identical karts, both identical engines, gear ratios and tires, both new clutches and one slips so bad it won't pull me up the incline on the driveway and the other works quite nicely?
Thanks, Bernie
the briggs are absoulte torque monsters for their size and net power.
BUT only as long as the briggs got full compression,
a mild drop in compression
(carbon deposites preventing a valve to fully close.. cylinderwall worn down a hair too much)
and even being slightly off in the fuel mix
can make a huuuge difference on a gear ratio like that.
Say you're on the edge with the setup..
and the kart is fresh from the bench
(bearings, chain, clutch and tires are new and perfectly setup)
aprt from the 'on the edge' gear ratio.
One engine however has (thanks to either lacking compression or being off in the mix)
IDK say 1ftlbs less torque than the other
and you as the only driver test these now (splitting yourself up and testing at the same time)..
you take a few runs on a flat stretch and everything is good..
both karts are within 1% of acceleration and top speed,
no difference you'd say is noteworthy.
But now you come to an inclination and try to climb that.
You stop just befrore that roll to the start line
and for one kart it doesn't appear to be an issue.
(the quicker one from above) and you climb that hills feeling the kart has a tough time getting up there but nothing too worrying.
and when you'r up ther you feel the clutch got really hot in the process.
The slightly slower kart however struggles alot climbing the hill,
it's clutch was already hot to begin with and half way up the hill it glazes over entirely it's hotter than a frying pan and just gives up..
you will not even get up that hill..
And as a result.. it won't even move you along a straight stretch any longer th clutch is shot.. burned out, glazed over and dead as a brick.
It's not entirely the clutch's fault IMHO.. it's the being on the edge ever so slightly ont he wrong side and then trying too hard.
Two karts for the grandkids..
that feels competetive..
one kid ever so slightly taller and heavier than the other,
one ever so slightly more worried at take off (not flooring the pedal like his competitor)
and it's clutch will gradually be getting worse over time..
and that's an exponential rate of change. so a 'new' clutch can be burned out in a matter of less than 4hrs of driving around
and while all you need is one kart getting stuck somewhere (pithole, dip in the field, a branch or stone on the road)
and the kid just kicking the pedal to "resolve" and instead of moving the kart melting the clutch.
It doesn't have to be a rookie driver mistake that ruined one of the clutches.
it could've been the minor difference building up.
But frankly.. it's been your fault in the end..
and I can prove it!
swap the clutches between the karts.
and the one that just propelled you forward will no longer be able to
and vice versa.
And clutch glaze can (as above) be made by a dumb driver mistake
or (as mckutzy already stated crrectly) be made off tiny little differences building up to kick your behind
if you buy just two new clutches.. chances are it'll be happening again in the foreseeable future (kids getting bigger over time history told us.. soooo maybe even quicker)
if however you choose to adjust the ratio to a more viable one,
you can buy yourself some time.
OH: the engine state is indeed my main concern.
when I got my kart (11" wheeled kartco 5hp briggs 4.8:1 geared one wheel peel) pulled me (~190lbs) up a very steep inclination (PO's driveway was ~15% (I would've placed a bet on it
not getting me up there to be honest)
but the rusted worn down clutch got just a tiny bit hot..
kart didn't struggle at all getting me up there.
So maybe one valve isn't closing completely, or you need oversized piston rings in the very near future..
or maybe you want to dial in the fuel mix some more (after cleaning the carb properly and thoroughly)
'sid
PS if you buy new clutches, buy
maxtorque SS they're very fairly priced (mine was 25bucks) and the blueprint for most chinese cheap clutches but a much higher quality as far as I can tell
and most of all.. CONSISTENT (engagement speed doesn't change too much between batches)