Petrol leak - any thoughts?

[Colin]

Went out for a ride on Sunday and quickly abandoned that and came home in a hurry as I had a big pool of petrol round the right side when I stopped a couple of hundred yards from home. Looked and it appeared to be coming from the pipe where it connects to the right bank of carbs.

Pulled it all apart on Sunday and found the hose from the T piece to the right bank was split right where it connected to the carbs. Yesterday bought new 10mm hose and all new clips. Fitted the new hose and clips. Started up and petrol now coming out of both carb bans with the rear carb bowl wet and the petrol dripping from there. Nothing is coming out of the large vent tubes that stick through the rear carb barcket or from the pipes beneath the bike.

Definitely not the new pipes and clips all of them are dry. I suspect stuck floats? I have a Danmarc valve so no problem with hydrolock.

If it is the floats can they be done on the bike or is it best to remove the carbs and do it on the bench? What parts do I need if it is the floats? Don't forget this is a European bike, we don't have ethanol and all our fuel is 95 octane.

Any thoughts/suggestions before I go too far?

[Ricky-D]

Have you done any work recently in that area of the motor?

***

[Pete]

If it is a float, take the carbs off the bike and clean them all carefully. Should take you 4 to 6 hours definitely easier than trying to do on the bike.

I did not understand you description of where the gas is coming from??
Usually when a float sticks it overflows into a cylinder or out the carb vent hose.

[Colin]

No work done anywhere in the last couple of months.

The petrol is actually dripping quite quickly from the actual rear carburettor on both sides now, where as initially it was from the right bank only. The whole float chamber is wet and the petrol is just dripping from the lowest point so it is coming from higher up the carbs.

To try to sort out where it is actually coming from before I take them off I think I will remove the tank and airbox and rig up a small temporary tank so I can actually see where it is coming from high up. I tried it yesterday with just the tank off but there was insufficient fuel in the bowls to leak it seems as though it is only when they are under pressure with the fuel flowing from the tank into them.

Thanks for the thoughts so far. I will update with what I find but it is a pain working in 32C heat with no shade  so usually an early morning job.

[X Ring]

For us 'mericans that be 90*F

Marty

[franko]

From my experience own experience i can tell you that i also had petro leaking from a very similar area and manner. I pulled the carbs, cleaned, and all the usual stuff. For me it was not a stuck float, the carbs actually looked very good. It was the O - rings on the connecting rods between the carbs ( of them i beleive. They were hardened and you could tell visually that this was the problem. I went ahead and replaced only those o-rings and did a cleaning and i have been goodo to go. this winter i plan to do a complete O-ring replacement when i have more time.

[Colin]

Franko, thanks for that it is certainly one thing that I will look at closely. 

[Pete]

The carb overflow hoses usually rest on the rear carb bracket, right over the rear carbs.