Is it the carbs?

[OhioShee77]

I recently had to split the case and replace the push rod , ball, adjuster on the pressure plate and the pushrod lever that goes through the case....After finishing the repair it fired on the second kick just like normal...the idle seemed a lil high but I figured it was cause there were some loose clamps before when i took it apart and figured it was that. It was like 2 am so i went to bed knowing I was going to have my shee back...went to go ride the next day and it wouldn't fire so back to the garage i went and have been there since I've checked everything (Spark, Compression, fuel, readjusted the pickup and verified is at .020, slides are on correct carbs, carbs synced, and electrical conections) so am gonna call it a carb issue...what yall think??? i can kick it and after adjusting the air fuel screw and adjusting the idel to where i have to hold the throtle for it to fire it will hit all most everytime but sounds to be running out of fuel ....today while i was kickin my a** of and making smal 1/4 turn adjustments to the carbs i found a sweet spot and the thing fired, ran and reved and sounded crisp and clean but then died like it ran out of fuel i mean wtf am i missing...also it seems to me that the timing is off (but it seems to be to far advance cause it will back fire slightly in the carb and then it will seem to much retarded and back fire through the exhaust and shoot about a 2 foot blue flame!!!)but there isn't a way with a stock plate to adjust the timeing is there? other then shearing off the keyway on the flywheel which i checked when i adjusted the pickup. Any ideas fellas???? i'll try to get a vid of me kicking my ass off for yall and let ya hear what it's doing later on this afternoon. but till then any ideas but be greatly appreacited. Thanks

[Jereme6655]

i dont see in your lists of tests that you ran a leakdown test.......it sounds like it coudl be running lean from an air leak. do a leak down and be certain. also check your reeds......backfires through the carbs can shatter/crack that good.....

[Larry's Shee]

First off you can't possibly adjust the carbs like that, it needs to be running, it started just by luck. X-2 on what Jereme said. Do you have good blue spark? Have you cleaned the carbs good? Not a quick douche, but COMPLETELY dissasemble and soak them? Double check EVERYTHING you did to carbs. Brass washer under main jet? Slide cutaway facing air cleaner? Float level set? Float bowl with little "BB" on front on left (choke) carb? Choke crossover tube between carbs on? Sync carbs best you can. Set idle air screws at 1 1/2 turns out.

 

When you try it again start with new plugs. If your reeds are good, put it back together and do leakdown test. Presume you didn't change anything on your set-up while it was apart? Presume we're talking stock carbs? While you have carbs apart write down main and pilot jet sizes. Also list up your mods.

[OhioShee77]

First off you can't possibly adjust the carbs like that, it needs to be running, it started just by luck. X-2 on what Jereme said. Do you have good blue spark? Have you cleaned the carbs good? Not a quick douche, but COMPLETELY dissasemble and soak them? Double check EVERYTHING you did to carbs. Brass washer under main jet? Slide cutaway facing air cleaner? Float level set? Float bowl with little "BB" on front on left (choke) carb? Choke crossover tube between carbs on? Sync carbs best you can. Set idle air screws at 1 1/2 turns out.

 

When you try it again start with new plugs. If your reeds are good, put it back together and do leakdown test. Presume you didn't change anything on your set-up while it was apart? Presume we're talking stock carbs? While you have carbs apart write down main and pilot jet sizes. Also list up your mods.

 

yes good blue spark, just completely disassembled carbs (stock version with tors elemanator caps) and fully cleaned(little debris in bowl other then that they were pretty clean looking... the guy i bought it from rejetted for a 65mm bore and i can't remember the jet size that was in it....something like a 320 or 340 i belive it was...not sure about the pilot jet size, i'll check...I added a New DMC Alien Exhaust is the only only change. I'm heading out in a few to work on it so i'll pull the carbs again and verify the jet sizes and re assemble and do a leakdown again (forgot to add that to the list at 5am this morning lol sry). thanks for all your advise guys! oh yeah is there any way to check the reeds other than looking at them?

[WINDYCITYJOHN400]

Any time I get any kind of backfire....I go straight to the flywheel. If you just had it all apart and fired it once......it could have come loose. If it doesn't star easy, it could be because it's sparking at the wrong time.

Once you rule that out.....do like they said and run a pressure test for an air leak.