paulmarshall
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[quote author=5275647764436D647272010 link=1366243636/15#21 date=1366400283]Hi Steve,I am yet to measure the 400 piston pin but according to Wambr they are different.Paladin made a very good point that due to our stroke being shorter, If we bored out to 94mm, (which is a stock 650 Bore) we would have a higher revving 484 cc. (I think.) What I did was buy a 650 engine and bolted it right in.I did buy the wiring loom and carb, decompression unit etc. I only brought the 650 wiring loom because the 400 loom does not have a decomp unit.However u can use a manual decomp as I do now, so a 400 wiring loom will work. The carbs are the same with smaller jets, so replace them. The head is the same. The other way which unless you do it yourself will $$$$, Split the bottom and fit new 650 rod and piston and Bore your barrall to 94mm. If your going that far maybe Bore out to 96 and use Verslagens 96mm Piston.
You say say the 400 has a short stroke so the only way I can see as to get the displacement up, is to fit a 650 crank as it must be a long stroke. No matter what combination of rods pistons, if the two engines (400cc and 650cc) have different stroke measurements, then the conversion is never going to get to 650cc. Does anyone think I am right in thinking this. I have always read from various forums that only the barrel and piston are different on the two engines. So If I can get hold of a second hand Crank, and rod and piston with barrel. I think I can get to 650 cc with re jetting of the carb.
[The stroke being the length of rod. The crank is the same as a 650. They would have used a different height piston in the 400.]
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