Posted May 11, 201410 yr I have a sr250 custom bobber, I've cleaned the carb multiple times, still doesn't help much. It will crank and idle, was only running only on half choke, it will idle and ride now with choke off but still wants to spit back through the carb and backfire, also wants to shut off sometimes at stops. How can I fix this?
May 11, 201410 yr Hi drew , spit back usually means the inlet valve aint closed proper, check timing and valve clearance.. how many miles on her ?
May 11, 201410 yr Author Odometer shows about 5000 but there's no speedo cable, so not exactly sure, but it's got to be close,I got this bike on a trade and just trying to get it riding, I'm kinda new to bike engines, any help on adjusting valves etc. would be very helpful
May 11, 201410 yr Author Also it has a CDI box so timing shouldn't be a big issue according to what I've read....?
May 11, 201410 yr Author Ok, I adjusted the intake valve, ran a lot better, but went back the same after a lil while, I've tested compression before, had 150 psi
May 11, 201410 yr Author Ok, done valve adjustment, tried 3 different plugs, cranks and runs on half choke, runs for a while and shuts off off choke and still spits and backfires when I rev it and let off, could there be a spark problem, electrical issue. I'm at a loss ,really need some advice here
May 11, 201410 yr Runs on half choke ? then its lean, is there a air filtre on her,,, screw air/ pilot screw in,,a half turn,
May 12, 201410 yr Author Adjusted pilot screw in all the way them out 1 and 1/4 the 1 and 1/2. No air filter, gotta get one. May try soaking carb, idk what else to do besides maybe rejecting carb
May 12, 201410 yr I'm no expert (see my other posts!) but without a filter to resist air flow you will not be getting enough fuel through. This is probably why she idles ok on half choke.
May 12, 201410 yr I'm no expert (see my other posts!) but without a filter to resist air flow you will not be getting enough fuel through. This is probably why she idles ok on half choke. Thats an expert assumption Andre,,, .... its the cause...
May 12, 201410 yr Author I actually kinda figured that, gonna get one tomorrow and see what happens, thanks for the advice guys , I'll repost the results later
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