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Restritive exhast can cause fouling, but it's minor compaired to all other factors. You have to check everything else before that. A few things to take in account,
Are you using the stock carb settings? remember the fuel mixtures have been radically changed since then
New jets?? (jets wear ov er time, like everything else)
Worn needles?
Worn pilot circurt?
Running the right heat range on the plugs?
My advive, check everything
 
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