You need everything from the crankcase out - that's carbs, heads, barrels and pistons. Rocker assemblies are identical on same year bikes. Pipes should be the same that year.
You SHOULD be able to find someone gagging to go the other way, and make a profit on the deal!
I recently did that myself - converted my 86 R80G/S to a 1000. Very straightforward - just replace it all!
A possible cure for the roughness is to use lighter pistons available from Touratech. The only real reason for the difference in smoothness is the greater weight of the 1000cc pistons. If you could get the pistons down to the weight of the 800 pistons you'd have the same balance, and it would feel just like a strong 800.
The best but most expensive way is to get the lighter pistons and also rebalance it. That means taking out the crank.
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Grant Johnson
Seek, and ye shall find.
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One world, Two wheels.
www.HorizonsUnlimited.com
__________________
Grant Johnson
Seek, and ye shall find.
------------------------
Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
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