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General Category >> Rubber Side Down! >> new rings, honed jug, rejetting... runs terribly
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Message started by Bobbert on 07/17/12 at 19:16:55

Title: new rings, honed jug, rejetting... runs terribly
Post by Bobbert on 07/17/12 at 19:16:55

I've got a problem. I'm trying to jet my pilot, but the 50, 52.5, and 55 all run like nuts and won't idle well.

I just replaced my glazed rings, rehoned my cylinder, lapped my valves at a machine shop, and put it back together. The jug is torqued to spec, the valves are adjusted, the carb boot and seal are tight and true, new exhaust gasket, new vacuum tube cap, and new spark plug. I set the cam lobes down with the timing marks set on TDC.

I'm running the standard Mikuni carb w/o any filter (the pod came unglued and didn't change the way it ran, so I left it off) and a lightly baffled HD muffler welded and sealed to my exhaust pipe. I've got a 155 main, 2/3 spacer, and 10 mm cut from the slide spring to stop backfiring.

Right now I'm trying to jet for idle. I've tried the 50, 52.5, and 55 jets. All three will run if left alone but run like nuts; the 50 lumps horribly, the 55 runs bubbly and self-detonates on and on after shutdown, and though the 52.5 runs more evenly than the rest, the fuel adjustment screw doesn't do much at all and it self-detonates a bang or two after the ignition is cut. I can only get a lumpy 900-ish RPM :-? with any of these jets with the throttle adjustment screw fully turned. Cleaned and left on idle, the plug comes out dry and black as a coal mine.

On shutdown I get smoke pouring from the carb. I removed the carb and there's a condensation of gas in the port. I turned it over without the carb and the bike backfired into the port. I held my hand in front of the port while I cranked and it feels as though the intake valves are letting air out.

WHAT IS HAPPENING HERE!? >:( >:( >:( >:( >:(

Title: Re: new rings, honed jug, rejetting... runs terrib
Post by rfw2003 on 07/17/12 at 19:28:16

to me it sounds like either the valves are not adjusted right or more likely when you put the timing chain back on you got it off by a tooth or two.

R.F.

Title: Re: new rings, honed jug, rejetting... runs terrib
Post by verslagen1 on 07/17/12 at 21:19:14

0C313C3B2C2A3133313B5E0 wrote:

I'm running the standard Mikuni carb w/o any filter (the pod came unglued and didn't change the way it ran, so I left it off) and a lightly baffled HD muffler welded and sealed to my exhaust pipe. I've got a 155 main, 2/3 spacer, and 10 mm cut from the slide spring to stop backfiring.

the 10mm cut maybe throwing off your idle jetting.

Quote:

Right now I'm trying to jet for idle. I've tried the 50, 52.5, and 55 jets. All three will run if left alone but run like nuts; the 50 lumps horribly, the 55 runs bubbly and self-detonates on and on after shutdown, and though the 52.5 runs more evenly than the rest, the fuel adjustment screw doesn't do much at all and it self-detonates a bang or two after the ignition is cut. I can only get a lumpy 900-ish RPM :-? with any of these jets with the throttle adjustment screw fully turned. Cleaned and left on idle, the plug comes out dry and black as a coal mine.

I'd say way over rich

Quote:

On shutdown I get smoke pouring from the carb. I removed the carb and there's a condensation of gas in the port. I turned it over without the carb and the bike backfired into the port. I held my hand in front of the port while I cranked and it feels as though the intake valves are letting air out.

Backfired or farted?

classic sign of cam out of time though.

Title: Re: new rings, honed jug, rejetting... runs terrib
Post by Bobbert on 07/17/12 at 21:30:03

7B687F7E616C6A68633C0D0 wrote:

[quote author=0C313C3B2C2A3133313B5E0 link=1342577815/0#0 date=1342577815]

I'm running the standard Mikuni carb w/o any filter (the pod came unglued and didn't change the way it ran, so I left it off) and a lightly baffled HD muffler welded and sealed to my exhaust pipe. I've got a 155 main, 2/3 spacer, and 10 mm cut from the slide spring to stop backfiring.

the 10mm cut maybe throwing off your idle jetting.

Quote:

I'd say way over rich

Quote:

Backfired or farted?

classic sign of cam out of time though.[/quote]

I'm going to fix the cam first, then check the pilot jet.

Title: Re: new rings, honed jug, rejetting... runs terrib
Post by wambr on 07/17/12 at 22:40:27

probably a stupid suggestion, but the condition of the shut-off (idle) valve in carb. once he jammed on my bike. and signs were similar to yours.

Title: Re: new rings, honed jug, rejetting... runs terrib
Post by Bobbert on 07/19/12 at 23:56:05

7264686777050 wrote:

probably a stupid suggestion, but the condition of the shut-off (idle) valve in carb. once he jammed on my bike. and signs were similar to yours.

DUDE. Not at all. Turns out I left out the spring in the deceleration valve and it was flooding the hell out of my carb!

Title: Re: new rings, honed jug, rejetting... runs terrib
Post by verslagen1 on 07/20/12 at 00:05:33

053835322523383A3832570 wrote:

Turns out I left out the spring in the deceleration valve and it was flooding the hell out of my carb!

cool, you got it fixed then. [smiley=thumbsup.gif]

Title: Re: new rings, honed jug, rejetting... runs terrib
Post by wambr on 07/20/12 at 00:42:08

[/quote] DUDE. Not at all. Turns out I left out the spring in the deceleration valve and it was flooding the hell out of my carb![/quote]
well, that's good! casket-then just opened (as Russians say) :)

Title: Re: new rings, honed jug, rejetting... runs terrib
Post by justin_o_guy2 on 07/20/12 at 00:45:07

Parts, left over from a carb rebuild, is an immediate sign of trouble.