Hi Aquila,
The link you have provided in your first post is for the correct clutch, however this is just for the clutch drum without the innards.
For the full clutch, check out the link below:-
http://www.zoomkarts.com/product.asp?productID=1151
As mentioned previously, if you go with Magnum you should be fine.
With regards to chain length for 22-66 gearing, we run this gearing at 3S but we have an MS. I can’t see the chain lengths for a 7Kart being a lot different to our MS. We currently run a 100 link chain on the left hand engine (inboard clutch) and a 98 link on the right hand engine (outboard clutch).
Cheers
Mark
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