lambretta muggy starts but will not go

[boxofbits]

Just built a new 225 mugged engine with 34mm delloto. It starts eventually ticks over revs but very boggy bottom end.Soon as I pull clutch in and try and set off it stalls.I know jetting not perfect but would expect it to go.Any ideas?

[jonzo172]

Have you got your gear cables the right way round?
You could be selecting second gear and trying to pull away?

[mick1]

In no particular order:

choke sticking ?
electrics too far retarded ?
blocked exhaust ?
poor fuel ?
Carb' blocked ?
Dodgy stator ?
Spark plug ?
Blocked fuel filter/tap ?
other......

[boxofbits]

Cheers checked all the above bar fuel it very low in the tank and is about 6 months old will change that,stator is fine but I need to borrow a strobe I guess as did it with timing disk only

[Livi- Graeme]

Piston in right way?

[coaster]

I'd have thought the carb is a bit on the big side for your setup. The Mugello is a fairly mild tune so a 30mm carb would be about right, a 34 would be more suited to a higher revving motor, TS1 etc.

[boxofbits]

Tried new fuel new plug ,timings ok strip down of carb next

[boxofbits]

Even though the choke works it seems really tight the copper plunger and the spring doesn't look long enough could this be it ?Have ordered a new one

[mick1]

Get the engine warmed up then disconnect the cable. See what it runs like then.

[boxofbits]

Right a bit of progress mate has fixed a air leak and checked timing choke replaced seems a lot better but really rich bottom end and still really hard to set off till you get to half throttle tried a lower pilot jet 38 but can't get anything out of the mixture screw its a vhsb carb going to try a 30 pilot but I think that's the lowest you can go is there any other way to lean the bottom end out?