merry xmas everyone.
been emailing T-Man Performance regarding there street performer upgrade.
he told me that because iv done 38000ks is would be better to go with the S&S 88" motor with 4 5/8 stroke on my stock bores.
what do you think guys?
im no sloach in the engine department, i have built some nice v8s and rebuilt the odd old dirtbike.
i havent touched a harley though and to be honest the whole process frightens me a little, altough if done during winter i could take my time.
I did see he menchions 4 5/8 88" stroke? how des this suit my standard bore 80"??
Well up to you m8, but I would keep stroke stock as strikers have a high piston speed & the stock evo barrel liner don't have that much meat . Also strokers vibrate a lot more. Piston skirt shorter so rock n roll. I ' seen some very quick 80 inch evoz but your bike so your call. Good luck
@ 38,000 klms the bottom end sould be still good unless you were slack on the oli change's + flogging her arse off, i change the oil in the tank tank every 2.500 & the filter every 4-5000 , just don't let the oil go black, it depends what year EVO 80 you have 1988 to 1992/3 have the weaker cases & could be a bit of a gamble on the fast hi comp list they can crack behind the front lifter block + the main case race can come loose in the case's , 1994 & up you would be O.K., if worried about crank do a run-out check on the pinion shaft + feel the big end with the top end + the alt rotor off & see what she feels like
There's plenty of things U can do to bump up performance on the EVO.They all add 2-5% more power and don't strain the motor. At 38,000 the motor should only just be run in.
Some of the things are single fire ign, S&S carb, S&S breather valve, cam,fuelstar, performance exhaust system, splitfire plugs, roller rocker arms, pushrods etc.
So with a standard Evo U can get 20-30% more power without doing too much or straning the original product whilst retaing reliability and longativety.
+1 there. I would do some mild hop-ups to the current engine before dumping a chitload of cash on a larger engine. Being an EVO there are some tried and true setups that will give you some great performance. Such as:
If your super keen you can shave 50thou from the heads (or use thinner head and base gaskets) to give the compression a nice bump upwards
Cheers for all this advice as well fellas, looking at going down this path in the new year.
what oil do you run? did you change oils once you turbo'd her? cheers for the advice im following your lead on this one.