Carbs Leaking Like Crazy

[SoraXS400]

It's the luck of working. A few weeks ago I took off all the panels to be spray painted, never touched the carbs (in fact I drained them) and now when everything is put together, the carbs are leaking out of every orifice. Not sure what to do, my petcock was also leaking no matter what, even turned off (with the engine running). Knocking on the float bowls didn't help like it did last time.

Going to take em apart tomorrow and figure out the problem. Anybody got tips for me? Thanks.

 

[arfstrom]

http://lmgtfy.com/?q=rebuild+mikuni+cv+carburetor
http://www.amckayltd.com/carbguide.pdf
http://www.iwt.com.au/mikunicarb.htm
http://kawtriple.com/mraxl/carb/carbadj.htm
http://jbmindustries.com/Yamaha650.html

 

[MerlinDudley]

By draining your carbs, everything has dried out, the float needles have stuck in the wide open positions! The only way to cure it is to dismantle the carbs, and free then manually!

Merlin

 

[xschris]

Fix the petcock first so that shuts off when the bike is off. Then do the carbs.

 

[SoraXS400]

Fix the petcock first so that shuts off when the bike is off. Then do the carbs.

Doesn't pull fuel when the engine is off, it doesn't pull when the engine is off unless in Prime.

 

[xschris]

Ok, that's good. Then move on to the carbs.

 

[SoraXS400]

Unlike the first time, these were a bitch to get off, and still somehow full of fuel. Time to clean them out, I'll let you guys know if I need new gaskets or if it's the float bowl issue.

 

[SoraXS400]

With the carbs off, I reseated the float bowl seaters. No leak anymore, but now I can't get the bike to run for more than 5 seconds, stays below 1k rpm, choke on.

 

[SoraXS400]

Update:

Got it to run for about 5 mins. Only ran using choke at 1k rpm. Any attempt to increase throttle stalled, and struggled to start again. Carbs are completely cleaned, only started after I adjusted the float bowl pin.

I've completely rebuilt the carbs, oem jets are in, I will take apart the carbs tomorrow again and see if anything got clogged due to seafoam. Wish me luck.

 

[NewHavenMike]

Ah I cant wait till I get my bike to the carb tuning stage lol

 

[Jeff0133]

Did you REALLY CLEAN everything, looks like something is clogging still, did you check the diaphragms for tears or pin holes, did you change out the throttle rod Seals? Take out all jets and clean every passage...then reset the air/fuel mixture screw?...

 

[xschris]

Plugs maybe fouled. I would replace those.

 

[SoraXS400]

Plugs maybe fouled. I would replace those.

Plugs have been changed, It gets spark but its an issue with either the carbs or the fuel mixture.

 

[SoraXS400]

Did you REALLY CLEAN everything, looks like something is clogging still, did you check the diaphragms for tears or pin holes, did you change out the throttle rod Seals? Take out all jets and clean every passage...then reset the air/fuel mixture screw?...

I will talk apart the carbs again and see if anything is clogging. I bought a rebuild kit online awhile ago and it was still packaged airtight, but I will check again.

 

[SoraXS400]

Carbs were all clean. Completely nice.

The problem was the float bowl.adjustment, as I expected.