FCR 41 grief

[SDN]

I just fitted FCR's again, was running really well stationary, so took it for a ride after about fifteen minutes I noticed fuel pissing out of the top hose which I have connected to the breather pipe. This was happening last time I fitted these carbs, so I checked and set the float hights to the recommended setting, and gave every thing a good clean.

now I am wondering if I have a punctured float - they looked OK?

The float cut off valves are worn or not seating? - they looked OK

Anyone got any ideas?

[cycloneranger]

Shake the floats, you will feel if they have any fuel in them. Try lapping the needle valve into the seat with a bit of Brasso or T cut. Use to have this problem with the flat slides on the NSR's

[SDN]

Removed carbs, removed float bowls, noticed some tiny black deposits, cleaned all, used some polish as suggested to lap valves to seat, ran fuel through to clean, rechecked float heights and put it back together. Used new plastic fuel line and fitted an in line filter. Seems to be running a lot better with no fuel coming out of overflow. Fingers crossed - should be OK.

[alextrx850]

Removed carbs, removed float bowls, noticed some tiny black deposits, cleaned all, used some polish as suggested to lap valves to seat, ran fuel through to clean, rechecked float heights and put it back together. Used new plastic fuel line and fitted an in line filter. Seems to be running a lot better with no fuel coming out of overflow. Fingers crossed - should be OK.

An in line filter is the good preventitave, especially to the age of these machines and to some of them that are laid up over time...any small grit will play havock on those float valve seats....fuel out the overflow or dribbleing down into the motor diluting the oil.....filter filter...plus the inline ones can be visually inspected to the fuel content and condition....if you don't have the Yam one in the TEE piece where the fuel line connects to the carbs....get one.

[NWS870R]

Exactly what i advised back in April last year then:

Quote:
Think i know what the problem is. It seems (from experience) that FCR's are far more sensitive to the slightest contamination in the fuel & they 'flood' easily with small particles of crap. This is probably just down to the fact that the original fuel feed lines have been disturbed & could do with changing due to ethanol degrading them slowly over time. Get yourself a length of Neoprene hose & connect it to the main inlet on the the rear of the FCR's & before connecting it back to the pump take the bowl drain bolts out which can be done without removing carbs (inspecting for little black particles of rubber - trust me - they'll be in there!) blow thru the open end of the tube till you go purple & dizzy! Compose yourself & blow again! Refit drain bolts & reconnect your new hose to the pump & i pretty much guarantee you'll be sorted!

[Killerwhale]

Exactly what i advised back in April last year then:

Quote:
Think i know what the problem is. It seems (from experience) that FCR's are far more sensitive to the slightest contamination in the fuel & they 'flood' easily with small particles of crap. This is probably just down to the fact that the original fuel feed lines have been disturbed & could do with changing due to ethanol degrading them slowly over time. Get yourself a length of Neoprene hose & connect it to the main inlet on the the rear of the FCR's & before connecting it back to the pump take the bowl drain bolts out which can be done without removing carbs (inspecting for little black particles of rubber - trust me - they'll be in there!) blow thru the open end of the tube till you go purple & dizzy! Compose yourself & blow again! Refit drain bolts & reconnect your new hose to the pump & i pretty much guarantee you'll be sorted!

Clap clap clap clap clap!

[SDN]

Exactly what i advised back in April last year then:

Quote:
Think i know what the problem is. It seems (from experience) that FCR's are far more sensitive to the slightest contamination in the fuel & they 'flood' easily with small particles of crap. This is probably just down to the fact that the original fuel feed lines have been disturbed & could do with changing due to ethanol degrading them slowly over time. Get yourself a length of Neoprene hose & connect it to the main inlet on the the rear of the FCR's & before connecting it back to the pump take the bowl drain bolts out which can be done without removing carbs (inspecting for little black particles of rubber - trust me - they'll be in there!) blow thru the open end of the tube till you go purple & dizzy! Compose yourself & blow again! Refit drain bolts & reconnect your new hose to the pump & i pretty much guarantee you'll be sorted!

thanks for the help, last year I was just b fed up with messing and went back to my standard set up. Hopefully all is sorted, though I think I'll fit a catch bottle to the overflow just in case.

[SDN]

Still leaking through overflow, so carbs off again for another clean and blow through, it's only happening on tickover which points to needle valves not sealing aginst full pump pressure.

One more chance then I will fit old carbs back on, Iv'e lost enough riding time in the first decent weather for weeks!

[SDN]

Removed carbs and float bowls took out needle valves and seats cleaned thoroughly and blew through until I saw stars. Reassembled and tested. So far all OK - will do longer ride later. 1st impression v good. Booms and crackles on over run nicely!