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Originally Posted by renault_megane_dci
Best bang for your buck as long as torque is concerned is to overbore the engine (not substitute for cubic inches as they say) but it would increase capacity so the FE can suffer.
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I seem to be losing the FE competitions to bikes with lots more displacement than mine, so maybe it would help rather than hurt. For lots more bore I might be able to fit the cylinder and head out of a TW200 into my engine. Apparently they are the same engine. That would add $$ though. I have yet to find a source for overbore piston for this bike. Actually I haven't even found a new piston. I can get rings.
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I polished the piston crown and cylinder head (more reflecting allows for more air expansion) since it is free.
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This I will likely do. Like you said FREE
[QUOTE]Boosting the CR is especially good from bottom to midrange, no gain up top.[QUOTE]
Perfect that's exactly what I need. I don't use the top end anyway, even at 80mph
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Is your bike a two valver ?
You could have the camshaft grinded for more lift instead of more duration.
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It is two valves.
I'd worry that I wouldn't be able to get a new one if it didn't work, but maybe I could find a camshaft on ebay and mod it then I could switch back and forth.
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A free flowing exhaust can boost FE but it is detrimental to mid-range torque.
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Oops, I did a straight through muffler, I guess I'll have to change that back.