Scooterotica

Got to the exciting point today of starting the scooter after a complete strip and rebuild. Started no problem and I think all the electrics are working as they should. I let it run for 5 mins or so but noticed there is a fuel leak on the carb. It is a Dellorto PHBH 30. Seems to be leaking between the float bowl and main body. I don’t believe it was leaking prior to strip but can’t be 100%. So the questions are, is it likely to be the seal? is it an easy task to change the seal on the float bowl? Any setting after doing this. I literally disconnected the hose connecting to the manifold and removed the cables. It has stood for a while though.

Blenks wrote:Got to the exciting point today of starting the scooter after a complete strip and rebuild. Started no problem and I think all the electrics are working as they should. I let it run for 5 mins or so but noticed there is a fuel leak on the carb. It is a Dellorto PHBH 30. Seems to be leaking between the float bowl and main body. I don’t believe it was leaking prior to strip but can’t be 100%. So the questions are, is it likely to be the seal? is it an easy task to change the seal on the float bowl? Any setting after doing this. I literally disconnected the hose connecting to the manifold and removed the cables. It has stood for a while though.

Just tighten it a bit and they are easy to replace carb gasket kit about £6

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Have you fitted a clear float bowl.... they always seem to leak!

No I’ve changed anything on the carb at all. It has the standard black plastic float bowl. I’ll order a gasket kit and have a bash at changing them.

Is the jet holder tightened enough,this doubles as the bolt that fastens the float bowl on.

Float height not right , constantly filling bowl , float needs adjusting so it shuts the float needle valve jet off sooner

Replaced the float bowl seal and O ring on the bolt and no more leak. Thanks all for the helpful suggestions

I was wrong. The leak is still there but not as bad. I have tightened the jet holder bolt as much as I dare. I have never done anything with carbs before so not familiar with issues or assembly. When I removed the bowl I could not see the needle so not sure of the condition. Is there anyway of testing or diagnosing the problem. I’m not too confident of replacing floats etc. I really do not want to start stripping the scooter down again either. Don’t want to run it until this is sorted.

Is the choke jet seated properly

Sorry Paul I have no idea what that is. I wouldn’t know where to start looking for it. Perhaps I should let someone with some knowledge have a look at it for me.