i'm doing a top end on my 80"evo..but i'm takin it up to 83" and goin from 8to1 to 10to1 compression..what should i expect besides rejetting the carb..will timing be an issue..it's a bolt on kit from ted's..i'm using cometic head gaskets..and is synthetic a good idea with a motor with 50,000 plus..thank you in advance..and i have new stock heads..the whole motor is stock ..what can i expect..thanks again
Did one of those kits on my buddies FXR. Be sure the oil drain back hole lines up, his didn't! Turn the cyl. upside down & put the base gskt. on & look for any thing blocked.
With 10.1 compression, your gonna wanna run a little bigger camshaft to keep the cylinder psi down or it will beat itself up on pump gas, id run something in the neighborhood of a evl3020 or a ev46.
With 10.1 compression, your gonna wanna run a little bigger camshaft to keep the cylinder psi down or it will beat itself up on pump gas, id run something in the neighborhood of a evl3020 or a ev46.
Diddo. You will need to decide what rpm you want the power to be in and what type of riding you plan to do so that you can pick a cam to meet those needs. You can get by with the exising cv carb, but would see an improvement going with a different one. The mikuni hsr 42 would be an easy one to put on and will perform well. Many have had good experiences with others such as s&s. I would switch to a different ignition such as a dayton twin tech so that you can tweak the timing curve to match the higher compression. There are other good ignitions out there as well.
Here's a link to the daytona twin tec module. http://www.daytona-twintec.com/model_1006.html
You can use your existing coil if you leave it as dual fire. You are probably also do for some new plug wires.
Tiawan Tedd's in Newburgh, N.Y???????? OUCH!!!!!!!!!!
RUN, don't walk from their stuff!!!!!!!!!!!
You be MUCH better off boring your OE cylinders, and touching up the heads at the same time.
Scott
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