tgus3
a member
Hi the brass bushing under the sprocket on my engine keeps cracking
.Why does it doe this? Can anyone help? Thanks
.Why does it doe this? Can anyone help? Thanks
clutch bushing giving out
- Thread starter tgus3
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karl
Well-known member
Oil.
Why does it doe this?
No oil.
Apply oil every ride or so.
Why does it doe this?
No oil.
Apply oil every ride or so.
mckutzy
Well-known member
Hello and welcome...
We need pic of said setup.... Sounds like your torquing it very badly or needs oil.
Typical bush needs oil every 2hrs of use...
We need pic of said setup.... Sounds like your torquing it very badly or needs oil.
Typical bush needs oil every 2hrs of use...
anickode
Active member
If you're overworking the clutch with improper gearing, riding at less than full throttle for extended periods of time, excessive weight, hills, frequent stop/starts, your clutch will overheat and cook the oil out of the bushing.
Oil frequently and/or adjust your driving style if you already do. Since you didn't mention oiling the clutch I'm guessing you aren't.
Oil frequently and/or adjust your driving style if you already do. Since you didn't mention oiling the clutch I'm guessing you aren't.
tgus3
a member
What kind of oil should i use?
anickode
Active member
I like Tri-Flow, but an SAE30 motor oil would be fine.
Just a few drops on the bushing.
Oil it, ride it for a few minutes to warm it up, then oil it again for the first time.
Then every ~2 hours of ride time.
Just a few drops on the bushing.
Oil it, ride it for a few minutes to warm it up, then oil it again for the first time.
Then every ~2 hours of ride time.
tgus3
a member
I will try that thanks
mckutzy
Well-known member
So howabout some pics???? I think there is more going on here then just needs oil....
tgus3
a member
here are some. The chain is very tight so that could be a big strain on it.
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Ebrownie
Member
Can you slide the engine towards the axle on its mounting plate? The chain needs to have a bit of slack in it. if you can't slide the engine, maybe try a half link.
KartFab
Active member
i see two problems
1) you said chain is too tight, thats easy fix... but you shouldnt even worry about that because
2) your original go kart in all likelihood had a 30 series torque converter
So in essense, it wont matter how many times you oil the clutch, or how loose you have the chain, your manco go kart had a torque converter. Not sure by the picture, on which one it had (th but based on your engine size, and tire size (im guessing eithe r 18" or 22")you need a '30 series TAV2'
That will solve your problems. Also, im not sure what size sprocket that is. It almost looks like its a #35 pitch sprocket. Is this the case? hmmm....
If its 18" tires, you need to go with the 10t type c sprocket that comes in the tav2 kit
if its 22" tires, it will put strain on your engine, and an 8t would be 'close enough' but this is with the 54t axle sprocket, not a larger 72t #35 chain sprocket.
1) you said chain is too tight, thats easy fix... but you shouldnt even worry about that because
2) your original go kart in all likelihood had a 30 series torque converter
So in essense, it wont matter how many times you oil the clutch, or how loose you have the chain, your manco go kart had a torque converter. Not sure by the picture, on which one it had (th but based on your engine size, and tire size (im guessing eithe r 18" or 22")you need a '30 series TAV2'
That will solve your problems. Also, im not sure what size sprocket that is. It almost looks like its a #35 pitch sprocket. Is this the case? hmmm....
If its 18" tires, you need to go with the 10t type c sprocket that comes in the tav2 kit
if its 22" tires, it will put strain on your engine, and an 8t would be 'close enough' but this is with the 54t axle sprocket, not a larger 72t #35 chain sprocket.
anickode
Active member
Kartfab, are you sure about the torque converter? That's a pretty huge axle sprocket and doesn't seem to be any evidence of a previously installed torque converter to my eye (with the limited pics)
mckutzy
Well-known member
It looks like the clutch is getting torqued by a tight chain. With the ratio and tire size, should be fine...
On my bike, I have a large rear tire 24"OD, with a 7:1 ratio. Not one bit of premature clutch wear. Always given a bit of slack and checked often... Now I understand this is a bike and less rolling resistance, but still.
OP I think we're going to needs few more pics on your ride here... Aswell if you have any previous clutches/bushes we could look at...
On my bike, I have a large rear tire 24"OD, with a 7:1 ratio. Not one bit of premature clutch wear. Always given a bit of slack and checked often... Now I understand this is a bike and less rolling resistance, but still.
OP I think we're going to needs few more pics on your ride here... Aswell if you have any previous clutches/bushes we could look at...
KartFab
Active member
Tires are unusually knobby for any small tire...
Back end of the go kart is a manco, and I've never seen a manco with disc brakes that doesn't have a torque converter.
Also it's been hacked up eh sprocket protector and motor mount moved n welded. The sprocket is throwing me off though so I could be out in left field.
It might even be that weird size 7" rim that manco used on its smaller bench seat karts. Makes sense because the disc brake is small too (e.g. Not the standard 8", probably more like 6")
Now that I'm looking at it, maybe the larger sprocket wouldn't fit with the sprocket protector, so they chopped the sprocket protector off?
All theories.
tgus3
a member
the rim size is 9 in whole wheel 18 in. The 'big' bottom sprocket has 95 teeth. the 'small' sprocket behind the clutch has 12 teeth.
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tgus3
a member
I really dont want to get a torque convertor if there's any way around that.
anickode
Active member
Whoo buddy look at that blue crankshaft. Clutch got HOT!
Get yourself a new clutch and keep it oiled.
A 7.9:1 gear ratio should be plenty with those tires as long as you're not doing hill climbs with it.
That thing would be a torque monster with a yellow spring TAV2 running that axle sprocket. 20.5:1 at engagement? You'd be able to pull a house up a hill.
They're only $60 on eBay... Burn up another clutch, and it will have paid for itself. Looks like it would fit with zero mxods as well if you installed it pointing forward.
Get yourself a new clutch and keep it oiled.
A 7.9:1 gear ratio should be plenty with those tires as long as you're not doing hill climbs with it.
That thing would be a torque monster with a yellow spring TAV2 running that axle sprocket. 20.5:1 at engagement? You'd be able to pull a house up a hill.
They're only $60 on eBay... Burn up another clutch, and it will have paid for itself. Looks like it would fit with zero mxods as well if you installed it pointing forward.
yeah I agree.. that looks like a huge heat issue..
maybe the clutch, maybe the tight chain having eaten away the crankshaft bearing already.
(judging by the fact it's darker near the crankcase... likely the bearing)
reduce chain tension!!!
new clutch might do, a good one (30-35 bucks) is due..
A TC can be had as said for as little as 60... and will improve your driving experience by a TON
(more torque.. more speed even)
plus you could get a slightly smaller axle sprocket and get even more speed...
frankly, get a TorqueConverter, that'd be a no brainer for people like us,
so please at least think about it, read some forum entries and search ebay for a TAV series 30
to check if you find a nice offer.
Oh and make sure the crankshaft bearing is in good working condition.
'sid
maybe the clutch, maybe the tight chain having eaten away the crankshaft bearing already.
(judging by the fact it's darker near the crankcase... likely the bearing)
reduce chain tension!!!
new clutch might do, a good one (30-35 bucks) is due..
A TC can be had as said for as little as 60... and will improve your driving experience by a TON
(more torque.. more speed even)
plus you could get a slightly smaller axle sprocket and get even more speed...
frankly, get a TorqueConverter, that'd be a no brainer for people like us,
so please at least think about it, read some forum entries and search ebay for a TAV series 30
to check if you find a nice offer.
Oh and make sure the crankshaft bearing is in good working condition.
'sid
tgus3
a member
What kind of clutch should i get? or torque convertor
tgus3
a member
think ill get this http://www.ebay.com/itm/361474208575
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