GR650 flooding on right cylinder

J

jacksonsmith

New Member
Hey all,

Ive been having some issues with my right cylinder for about a week, intermittently decides to shit itself out of the blue. Usually its just a carb issue and i wip them off, give them a clean and bench sync, then they're fine. I may be doing the sync wrong? Mukini BS36 are the carbs, and boy are they a pain in the are to tune for mixture and slide adjustment.
Any recommendations for an up sell? couldnt hurt to upgrade to a better carb im sure.

Iv bought myself a carb sync gauge, a compression tester (wrong size, waiting on 12mm to arrive), new spark plugs...

Ive noticed fuel in my oil, changing oil and filter tomorrow.

Ive got spark, I've got fuel and air, WHERE AM I GOING WRONG?


Any one out there know of the possible issues? am i looking at valve adjustment? Has anyone got any advice on this process? I've got my user manual handy and am relatively un afraid of getting in there. Ive had to work on my bike at least every 2 weeks since i purchased it, a labour of love and hate, I'm paying for someone else's mistreatment of her.

My thoughts are....

Shitty petcock that needs replacing, spark caps not functioning ( but they have spark o i dont know?)


Any help for a beginner like myself is met with complete and utter gratitude.

cheers legends


*original airbox, new short mufflers (baffled)
 
A more specific description of the symptoms would be good, but try the coil if it's intermittently running on one cylinder.
 
cleaned and bench synched my carbs due to a loss of power, bike felt boggy from 1st to 3rd. Rode it after a clean with no dramas and the problem seemed to of been cleared.

I awoke the next day to go to work and the bike wouldn't kick over on the right cylinder, small amounts of fuel coming from the exhaust (flooded).

I pulled the carbs again to triple check, everything was fine, leaned out my mixture on the right side, new spark plugs.... still flooding. Left cylinder is fine.
 
Sounds like either your RHS carb float valve is gunked up / worn out or your fuel tap (if it is vacuum operated) is leaking into the vacuum hose.....which is probably linked to the RHS inlet port.
 
Nothings Gunked up in the RHS carb, its had a deep clean and re set, needle is a touch worn (rounded tip) and ive noticed that the seat on the right doesn't grab as much as the left when re-inserting to its port.

Vacuum line goes into the RHS carb, is there any way of diagnosing this, the line is dry when i take it off?
 
It does sound like petrol getting past the float valve in the right hand carb.
The vacuum line should always be dry, does it have separate taps for each carb?
 
I had a similar issue on my 82 gs450 last year. Turned out that one of the floats had a pin hole leak in it. Causing the float to let gas in and not be so buoyant. This allowed the needle valve to stay open and flood. Also my needle valves were worn so I cleaned em up and repaired the float. Problem fixed

Sent from my SAMSUNG-SM-G920A using DO THE TON mobile app
 
SHAUN6691...

hit the nail on the bloody head!

two pin hole leaks when i submerged them in water, float needle is worn too.

Ive injured my hand and had some surgery so im out of action for at least a month. Good time to order some parts from the US and start re building the carbs.

Thanks guys
 
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