Weber flat-spot

[Akinesis]

I have a flat-spot where the car would seem to die if I held the throttle there long-enough. It's around 4/5ths of the throttle where the second valve opens on the weber. It's doesn't seem to be fuel starvation. Has anyone got any ideas on this??

[Akinesis]

I've just realised after reading another thread that I've not connected the vecuum pipe from the back of the carb to ther servo valve. Could this be the reason at all??

[james butler]

awnsered ur own question m8. check all vacuum pipes but also ur manifold to carb gasket.

[Akinesis]

awnsered ur own question m8. check all vacuum pipes but also ur manifold to carb gasket.

I hope I have. I checked the gasket before I fitted the webber and it seemed fine, but think I will change it anyway. Also, there was a split in the rubber mount, but it didn't look deep enough not sabotage the vacuum. Will replace these anyway and see how I go on next track day. Would not having the vacuum hose fitted to the servo effect the braking at all??

[roccodave]

your brakes probably will be affected if you have left the hole in the valve open but should get better when you attatch a pipe from it to the carb
ive never run without this vac pipe so didnt think to mention it before but i would think that is the running issue sorted when it is fitted
the best way to check the baseplate is start it and gently pull the carb forward/back and left/right if revs dip or it dies it is letting in air

[Akinesis]

your brakes probably will be affected if you have left the hole in the valve open but should get better when you attatch a pipe from it to the carb
ive never run without this vac pipe so didnt think to mention it before but i would think that is the running issue sorted when it is fitted
the best way to check the baseplate is start it and gently pull the carb forward/back and left/right if revs dip or it dies it is letting in air

Fantastic! Cheers fella!