Need help with driven pulley

[echo7bravo]

I bought a new comet 20 drive pulley and driven pulley. Ther driven pulley keeps locking all the way up and my engine is just smoking the belt on the drive pulley.

Is there something wrong with the preload? It came pre-assembled. All I did was install it.

Any and all help is greatly appreciated!

-Adam

 

[itsid]

pics of your setup?

sure it's series 20 ?
(don't tell me there's a 20 stamped on the cam, that's the cam angle not the model number)

how is it installed?
series 20 cam must face outboard (since you haven't changed the spring to a reverse wound one)
series 30 the cam MUST face inboard (you can't change that)

belts for a series 30 MUST be series 30 belts, you cannot take just any random v-belt.

Post pics.

'sid

 

[Randy H]

belts for a series 30 MUST be series 30 belts, you cannot take just any random v-belt.
'sid

I had an old kart, someone tried to use a serpentine belt. At a glance it looked legit.
It did not work well.

 

[landuse]

pics of your setup?

belts for a series 30 MUST be series 30 belts, you cannot take just any random v-belt.

'sid

Aaand....it must be the right 30 series belt for the center to center distance that you have your pulleys set at

 

[echo7bravo]

Sid,

The Carter Bros manual said series 20 so that's what I ordered. The jack shaft has the driven pulley facing inboard.

---------- Post added at 07:43 AM ---------- Previous post was at 07:42 AM ----------

Should I go order a series 30 set of pulleys and belt?

 

[itsid]

no, if you ordered what the manual says comes stock, you should be fine.
but make sure the belt is corectly sized and aligned!
chances are the engine is no longer original and thus might have been shifted slightly out of alignment which alone can cause your issues.

So again: PICS!

No really, post pictures, we can see much more than we can tell from your explanations, no matter how much effort you put into it.

'sid

 

[echo7bravo]

I'm out and about but will post pics as soon as I get home. I'm thinking I have wrong spring. I read 20 series can have clockwise wound or counter clockwise. Gonna compare to original when I get home too.

I bought new driven pulley because original had bent pulley. Spring from original driven pulley should still be good if in fact I have the reverse twist spring installed now.

Will post pics regardless

 

[echo7bravo]

OK so I lied. I was pressed for time and forgot to take photos. However, when I was at home I did manage to figure things out and get it fixed. So the 20 series driven pulley has the option to be inboard or outboard since it has the symmetric belt.. One must order the correct spring for clockwise or counter-clockwise rotations. The kart that I was working on has an inboard facing driven pulley. It face opposite direction of the drive pulley. I disassembled the new driven clutch that I purchased and replaced the spring with the spring from the original clutch. (pulley pieces on original were bent) All is well and the kart now grips and rips. I will take photos when I get a chance for the sake of someone else having the same issue.

~Adam

 

[itsid]

a series 20 has in inboard facing driven by default!
(in fact it should always be facing inboard.. I cannot recall seeing any reverse wound spring for it recently...)

Anyways, what I wanted to say: if you buy a series 20 driven clutch from any supplier, it WILL have the correct spring isntalled to be mounted facing inboard.
(if you mount it incorrectly facing outboard, you might ruin the cam buttons and spring in short order though)

Now, I hope you didn't forget to preload the spring properly.

'sid

 

[echo7bravo]

I'm tracking on this now (like a pawnshop VCR). So note to anyone buying series 20 driven clutches on Amazon or Ebay. Be sure you have the correct spring for the direction of your pulley (in our outboard facing). Being that the series 20 system is symmetrical, you can use it either way dependent on which direction the spring is wound. All other parts remain the same.