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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
'02 CR250 Porting & Head Shaving
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[QUOTE="john stu, post: 613852, member: 27637"] nuts as far as carb tuning you i doubt you will end up running the exact jetting (because of altude,fuel,rider,ect) that i am but i can tell you that the s-8 nozzle made the biggest differance in getting the bike dailed in for me. i did get the bike to run great on pump fuel but it was still finiky with temperature on pump fuel i think the bike runs very close to detionation stock and to keep it safe honda jetted the bike rich. if you lean it out to run clean at 90 degrees when the temps fell to 70 degrees the bike would ping and i would have to go richen the jetting to stop the detention and then when the temps went back up to 90 it would be rich so i would have to lean it back out ,the easy fix for me was to run race fuel i was planning on using it anyway after having it ported so i gave it a try(vp c-12) then with the race fuel i could lean the bike out just enough so it would run clean when it was 90 degrees but then if there was a cool day the bike would not detenate and ping so if you want your bike to run perfect and not have to mess with jetting all the time for me the answer was race fuel but to be honest i don't think it was the carbs fault i think it had to do with the bikes compresion ratio because just increaing the octain fixed all my tuning isues. also i ran the bike at 50/50 race fuel and that was all it took. i really didn't want to have to run race fuel all the time but after seeing how good ny bike ran after trying it i just couldn't go back and after all its probuly better for it anyway.and as far as the reed tension i tryed the high and low back to back and the top end seemed the same but when set in low tension the bike seemed to come on the pipe sooner to low is where is stayed.i think i ended up with a 400 main, 72 needle,s-8 nozzle and a 30 pilot with the air screw set at 1 1/2 turns out but like i said the s-8 made the differance in getting the run clean and the race fuel keep the detionation away.after erics porting the bike seemed a little lean so i have been making my way closer to stock again on the pilot and i went up to a 410 main now i would recomend you to send you cyl to eric he's cheap and he did exactly what i asked for witch was some more bottom end with out losing any top and i ended up with some more bottom end with it seems like more top end too!!!!you really should give the race fuel a try just lean the bike out untill it runs clean and then run the race fuel 50/50 problum fixed.i have checked my plug all the time and its always tan even after hard full throttle runs or after just some trail riding i have had the same plug in the bike all summer and it runs great stock the bike always wanted to foul if i went for a trail ride just for 5 min. now i can put around all day with my nephew (9 years old)and it doesn't miss a beat and then after hammering down a 5th gear straight wide open i can pull the clutch in and kill it and check the plug and its still tan.it doesn't get any better.also add one tooth to the rear sproket it helps a lot as far as being in the right gear it seems to make the bike pull better especialy when short shifting to third . [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
'02 CR250 Porting & Head Shaving
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