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1fun426

02 426 carb question

27 posts in this topic

Should the brass fitting in the carb body for the main fuel line swivel? It doesn't have side to side play, but it will "spin".

The bike wont stay running after I start it, pops and runs like crap, so its getting lean somewhere...and I'm thinking that's the spot.

fuel line to carb.jpg

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Just ran out to the garage an mine does to? Never noticed it really. I rode 4-5 hours today on some pretty nasty stuff and bike rode awesome! Imo i don't think that's your prob bud. I also ride a yz426.

Edited by Tford713

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Did it just start doing this? Has it always done that? Did you just get the bike?

Never done it. Ran fine last season. Sat for 6 weeks. Started it last week, took a few tries but she started and ran up the street a few times just fine. Tried again yesterday, thought I was going pass out from kicking it. It would run if choke was open and I was monitoring throttle, popping the whole time then die. then it would take a while to start again.

Havent touched the carb, hot start looks fine, going to clean it tomorrow and see what happens.

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Never done it. Ran fine last season. Sat for 6 weeks. Started it last week, took a few tries but she started and ran up the street a few times just fine. Tried again yesterday, thought I was going pass out from kicking it. It would run if choke was open and I was monitoring throttle, popping the whole time then die. then it would take a while to start again.

Havent touched the carb, hot start looks fine, going to clean it tomorrow and see what happens.

Yeah definitely clean that carb. Could be bad gas to a tiny piece of sand/dirt if not check your valves it's very easy. Just need a feeler gauge. Sounds like the carb though.

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Yeah definitely clean that carb. Could be bad gas to a tiny piece of sand/dirt if not check your valves it's very easy. Just need a feeler gauge. Sounds like the carb though.

Im going to throw some fresh gas in and see if it starts after a couple kicks. Then that carbs getting cleaned. As for the valves, if Im checking those may as well throw in a new exh cam to get auto decomp!

Thanks everyone for all the advice

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Im going to throw some fresh gas in and see if it starts after a couple kicks. Then that carbs getting cleaned. As for the valves, if Im checking those may as well throw in a new exh cam to get auto decomp!

Thanks everyone for all the advice

Now your talkin! Good luck hope it's something simple.

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Put some fresh gas in and kicked for a few and she fired up. However, only stays idling with the choke, but doesnt pop as bad. Choke off idle drops and dies.

Edited by 1fun426

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I'm thinking pilot jet. Take your carb apart spray a bottle of carb cleaner inside and spray through your jets. Make sure the pilot jet isn't clogged. Did you try turning your idle up?

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I'm thinking pilot jet. Take your carb apart spray a bottle of carb cleaner inside and spray through your jets. Make sure the pilot jet isn't clogged. Did you try turning your idle up?

All jets were clean, and I cleaned them again and the carb. I was surprised to see the pilot was a 72, bigger than I expected.

Unfortunately I went to move the exhaust tbolt clamp and the head snapped of, so I cant try starting it again until I get that fixed. But I think ill check the valves while im waiting and throw in a hot cam.

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All jets were clean, and I cleaned them again and the carb. I was surprised to see the pilot was a 72, bigger than I expected.

Unfortunately I went to move the exhaust tbolt clamp and the head snapped of, so I cant try starting it again until I get that fixed. But I think ill check the valves while im waiting and throw in a hot cam.

Good luck! Keep us posted!

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I was surprised to see the pilot was a 72, bigger than I expected.

That, I believe, is the starter jet, not the pilot.

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That, I believe, is the starter jet, not the pilot.

I think you're correct. I just looked up the pilot... I took both opposing jets to the main. The short one had 72. It appears the longer one is the pilot. I didnt see a number on that one

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good news - carb clean did the trick. bad news - broke the fastener that holds the right side of the gas tank to the frame. Snapped it off almost flush. Tried drilling it out, then snapped my extractor when trying to extract it... now I cant find a bit that will actually drill it so I can attempt to extract it again. Now the hunt begins to figure out how to get the thing out.

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I'm sheet metal tech by trade and drilling a broken screw extractor is tricky business. I have done that before. The only thing I could recommend is to try and shatter the remains of the extractor which isn't easy either but its very hard material which also makes it brittle. And then find a better easy out

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I'm sheet metal tech by trade and drilling a broken screw extractor is tricky business. I have done that before. The only thing I could recommend is to try and shatter the remains of the extractor which isn't easy either but its very hard material which also makes it brittle. And then find a better easy out

Getting some carbide bits today. Got the extractor out so I can try to drill again. Other problem is I forgot to keep the screw cool when I was drilling it out, so now im afraid I welded the thing in there.

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