Topic: 630 to 530 conversion

[torrinh]

Hey guys,

so I just ordered the 530 conversion sprockets from Partsnmore, 15 tooth cf sprocket and 41 tooth rear. My question is: How many links to I need for my 530 chain? My feeling is 106. Am I warm?

[moham]

If it's for a 78K (I'm assuming from your sig at the bottom that it is) then read the last post in the following thread (posted in the FAQ). It's what I referred to when changing out to 530 on my Ocho.

http://forums.sohc4.net/index.php?topic=372.0

Dollar Bill Ya'll...

[TwoTired]

Isn't the 15 /41 combo specified for a 630 chain or a chain with a 3/4 inch pitch?

A 530 is a 5/8 pitch chain.  So, the combo should be more like 18/48 or 17/48 sprockets, depending if you are going for acceleration, or lower cruise Revs.
 A 15 T 530 sprocket is going to be very small and make the chain bend a lot, thus wearing it out faster.  This is the kind of thing that makes holes in engine cases.

Cheers,

[moham]

I changed to 18/48 per the thread I referenced. Looks like OP needs a couple new sprockets.

According to the model guide, 15/41 for ratio of 2.733 was stock set-up for K8.

[torrinh]

I think the diameter of the sprocket remains the same, but the teeth are cut for a 530 pitch chain. Hopefully. Anyone here use the Partsnmore 630 to 530 sprocket conversion for their k7 or k8?

[cb750k7]

Hi,
I have counted 103 links on my converted 630 to 530.....

[moham]

I think the diameter of the sprocket remains the same, but the teeth are cut for a 530 pitch chain. Hopefully. Anyone here use the Partsnmore 630 to 530 sprocket conversion for their k7 or k8?

I see what you mean on the partsnmore website listing those sprocket sizes as "530 conversion" but I couldn't find any hits on the search (for this site) to verify if it's accurate, which is kind of surprising. All of the searching I've done point to the 18/48 JT sprocket conversion, but I'm sure somebody that's used the partsnmore stuff will chime in. You could always call partsnmore to verify sprocket sizes and ask about chain size. I bought a 110 link o-ring chain for mine but I can't remember how many links I left off...

[TwoTired]

I think the diameter of the sprocket remains the same, but the teeth are cut for a 530 pitch chain.

That's impossible.  The roller valleys must be on 3/4 centers for a 630 chain and 5/8 centers for a 530 chain.
15 teeth have 15 valleys.  15 x .75 = 11.25 inch circumference.  15 x .625 = 9.375 inch circumference.

The 630 15T sprocket will have a 3.58 inch diameter, and the 530 15T sprocket will have a 2.98 inch diameter around the roller pivot centers.

The tighter you wrap a chain around a shaft, the faster it wears out.

Good luck!

Edit: teeth/valley error corrected.

[CrisPDuk]

Lloyds right, different pitch chains have different diameter sprockets for a set number of teeth.  If you google it, you can find the various ISO standards, they tell you everything you need to know

I must pick you up on one thing there though Lloyd

How can a 15 tooth sprocket only have 14 valleys?  Does the valley between the 15th & 1st teeth not count

[TwoTired]

Lloyds right, different pitch chains have different diameter sprockets for a set number of teeth.  If you google it, you can find the various ISO standards, they tell you everything you need to know

I must pick you up on one thing there though Lloyd

How can a 15 tooth sprocket only have 14 valleys?  Does the valley between the 15th & 1st teeth not count

You're right.  I've been cutting wood lately where you make one less cut than the number of pieces you want.

I'll go back and edit my previous post.  I suppose I shouldn't be doing this stuff at 2 AM. 

Cheers,

[CrisPDuk]

That's it

Edit your post and make me look like clueless numptie


I don't normally need help to do that either

[fishhead]

http://www.z1enterprises.com/reference/chain630to530.aspx