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mods and jets

islandlife2010-08-11 04:27:12 +0000 #1
so i got all my new parts in the other day (dyna cdi, pink primary, black secondary) and am trying to figure out the jetting. i already shimmed the needles with one #4 brass washer each. and threw in a 142 jet for the front, and 145 jet for the rear to get started. how can i tell if the mains are too big or small? on nyroc, it says to ride the bike around at 1/2 to 3/4 throttle, then kill it and check the plugs. can i do this without physically riding the thing around? or does it need to be under load to be accurate? i have also drilled 6 1/2" holes through all the baffles in the stock muffler, but left the exhaust tip/resonator alone. the bike sems to run well now, idles while cold, idles while hot, no stumbles, only thing i've noticed is if i am on and off the throttle repeatedly, it will sometimes pop through the carb.

on a side note, i love not having to press the override button in reverse!
Bootlegger2010-08-11 04:39:35 +0000 #2
1/4-3/4 is your needle....3/4-WOT is your main jets....1/8-1/4 is your Pilot jets. I assume you are not using a Dynojet kit?....that is ok as well cause a lot of the 650 SRA don't like Dynojets needles. If its backfiring its more than likely lean. Ride it around for a little bit...see how it does at all throttle positions....LET IT COOL OFF COMPLETELY before removing your plugs to check it....I would just check the front plug and see what it looks like and go off it....if it looks good then check the rear. If you don't let if cool off all the way....the threads in your head are VERY easy to mess up on you....also put some anti seize on your plug threads to be on the safe side.
islandlife2010-08-11 05:05:24 +0000 #3
so i dont need to shut the motor off while i have it running at 3/4 throttle to check the plugs? also, i found when i went to set the pilots the front would act normal as i turned it, slowing the motor slightly when turned far clockwise and speeding back up when turned counter clockwise. but the rear did not seem to affect it in any way. i just turned it out the same amount as i had the front for now, but what would cause this?
Bootlegger2010-08-11 05:18:17 +0000 #4
That was not the pilots...they are jets...that was the air/fuel mixture screw you were adjusting.

Unless your tuning it he carbs you don't have to do it like that....I do when I tune them...but just to check it out I wouldn't worry about it. BTW, where do you live?



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