YBR 125 misfiring

[Korlad]

Just put new carb on my '05 YBR, new plug and battery. Misfires badly and fouls plug very fast. Using lots of gas too. I'm not much of a mechanic. Any suggestions for getting her running right? I'm on a remote island and parts are hard to come by.

[Nobby the Bastard]

Why did you put a new carb on it?
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Korlad]

Unexpected lengthy trip to the states and it got gunked up. New carb is half what a rebuild kit costs. Orings and such are always a problem. When I returned it had started, but the jet needle stuck and flooded the crankcase and air filter with gas on the very short trip around the block. (Yes, I changed the oil). When I saw how bad the 'rings were, I just ordered a new carb. Parts are a bitch in this country.

[Fin]

[Commuter_Tim]

[Korlad]

I CAN rebuild a carb. But getting the new jets, needle and seat, orings, and the basics that you replace during a proper rebuild costs TWICE what a new carb does.
This definitely sounds like a carb issue? I'm concerned that the gas in the oil may have created issues in the cylinder perhaps?

[RhynoCZ]

If you can rebuild the carb, then next time, just take it apart and clean it. You nearly never need brand new parts to clean the carb. Buy a carburetor cleaner and have some fun.

No, you have not damaged anything around by swapping the carb. The petrol in the oil issue must have been there earlier. Although, if the float was stuck and the fuel tap was set to ON, it could leaked though the carb into the engine.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Korlad]

I live in the tropics and our gas sux. Combine tropical heat with that and orings don't last here. I've lived here for 17 years and know how rubber deteriorates. I DID take it apart before I ordered a new one. If anyone has any suggestions on what I might try to get the bike running better, as opposed to bashing my meager mechanical abilities, I'd be beholden. I've adjusted the idle stop screw down and the throttle cable is at the correct tension. Main jet adjusting screw next? Again, is this definitely a carb issue?

[Ariel Badger]

It is 100% carb. Are the jets correct? Is it the right carb?
____________________
Bikers make great organ donors, get 115 on your licence today.

[Korlad]

It's the right carb for this bike. Looks just like the one I took off. How it's jetted, dunno?

[Commuter_Tim]

Jets typically have their numbers engraved into them.
Only way to tell is crack that carb open again.
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The above post is most likely nonsensical.

I ride a Bandit 600... badly.

[Nobby the Bastard]

[Korlad]

Can YOU reel off the numbers of YOUR carbs"s jet?

[Nobby the Bastard]

[Korlad]

Did you not read the entire thread? Particularly in reference to the price of parts on a small island in the Bahamas? I'm just looking for some help...getting the carb I have tuned, if that's the problem. I'm not an ace mechanic and I had this idea that folks on the forum might share their knowledge and experience. If I WAS an ace mechanic, I wouldn't need any help.

[sickpup]

[Korlad]

So when you buy a new carb, you pull the jets and check the numbers against the one you removed???

[Nobby the Bastard]

[Korlad]

And replace the bad orings with what?

[Commuter_Tim]

[Korlad]

When I have rebuilt other carburetors in the past, the rebuild kits usually include new jets, orings and gasket. To assume that the jets are fine after a few years in the tropics is not, IMHO, wise. This carb has a main jet adjustment screw. Think I'll try that before I build frankencarb.
Our gas here can be questionable as well. May drain the tank and refuel. We had a bad hurricane last fall and word is that some stations got water in their tanks.
I'm just not certain that such a simple carb could have arrived new with the wrong jets. Does that happen often?

[RhynoCZ]

It could, take off the carburetor that's on the motorcycle at the moment, take off the carb bowl and check for any slime in there. If you find slime, even slime balls, then you've got water in the fuel. Do you run a fuel filter?

EDIT: Water in fuel won't cause misfiring, it'll only create slimeballs in the bowl of the carburetor, that gets sucked into the jet under load, blocking it.
____________________
'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Fin]

It's not definitely a carb issue, could be inlet, wrong air filter or battery/spark problems but from what you've said it sounds like a carb issue.

If you had some carb cleaner you could spray it on the intake/inlet manifold to check

[Vincent 2]

Hi, maybe your situation and weather might be some of the cause see below








and the site can be found at
https://www.iwt.com.au/mikunicarb.htm

[Korlad]

Although it says the correction factor for the current air temps is .98 (no change in jet sizes), that site has a ton of good info. Thank you very much!