DoubleJay Posted April 1, 2020 Report Posted April 1, 2020 Hey guys , looking to pick your brains a bit. I have a 98. T5 pipes . Pro design filter. Holes in air box lid. Stock carbs w 280 mains ,27.5 pilot about 2 turns on air screws . Middle needle position. Just rebuilt top end. Wiseco pro lite 65.25mm pistons. Cylinders were bored by a shop . He said he cleaned up and polished cylinder intake and exhaust ports . Pro design cool head w 22cc domes . Carbs are synced pretty good w out a tool . 32:1 mix w amsoil dominator on 91 ethanol free pump gas . I’m at 900 ft elevation . In New York State . About 40 -50 degrees now . Bike starts and runs pretty good. Seems like it could go a little faster on top end . Almost like it being held back a bit at wot. After a bit of riding plugs are pretty black. My thought were to maybe try a 260 main And adjust needle position 1 slot . It’s gonna get warmer here too. How does my set uP look ?? Help is very appreciated Quote
DoubleJay Posted April 1, 2020 Author Report Posted April 1, 2020 Did a compression test, 140psi on both. Did test on cold engine though w one plug in Quote
DoubleJay Posted April 2, 2020 Author Report Posted April 2, 2020 I don’t think it’s compression. Bike rips pretty good . Has no problem wheeling even when I’m trying not to . Accelerates very well out of corners. I’ll do a proper compression test when I can. Any other thoughts? From anyone on my setup?? Quote
hoppedupandcutdown Posted April 2, 2020 Report Posted April 2, 2020 I'm running almost the exact same set-up, but 20cc domes and 1500 ft elevation. Wouldn't think I'd go any smaller on the main if I were you. Clean and re-oil the filter maybe? (careful not to over-oil.) Quote
DoubleJay Posted April 2, 2020 Author Report Posted April 2, 2020 Reason I’m thinking to go from 280 to 260 is .. plugs are pretty black and temp is gonna get hotter. Quote
Mattchev Posted April 7, 2020 Report Posted April 7, 2020 I had pretty much this exact setup but was running with the lid off, and ran great. I don’t think it would hurt to go down to 260 and see what she does. Def try to do a plug chop or at least pull them after first ride and see what they look like Quote
Stingray Posted April 7, 2020 Report Posted April 7, 2020 (edited) Why dose everyone guess at jetting. Do a plug chop and you will know what you need to do. Warm bike up on old plugs till hot change plugs ride bike wide open like you are racing through all the gears clear to top safe rpm pull clutch and kill bike, keep clutch in till stopped do not idle cut threads off plug or slide a 3/4 hole saw over top of plug cut down till ceramic comes out easily measure soot ring with caliper 2 mm perfect smaller lean larger rich Edited April 7, 2020 by Stingray Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.