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series 2 150cc problem.

PostPosted: Mon Dec 03, 2018 7:38 pm
by pg42
Engine rebuilt and is fitted with MA18 carb. Runs fine without air intake fitted but stalls even with just the hose fitted (no filter fitted). Any ideas please folks.

Re: series 2 150cc problem.

PostPosted: Mon Dec 03, 2018 8:31 pm
by Warkton Tornado No.1
As I am always cynical of the standard bellows coping with even a moderately tuned engine, the first thing I would ask is if your engine is absolutely standard & as originally built.

If it is as OEM, then I'd suspect that your carburation is too rich. The body, slide & jets all wear & the consequence is that the fuel/air mixture becomes richer.

If the engine starts from cold with no choke, or it dies if the choke is left on (to cause a fast idle whilst warming up) then it could be that the MA18 needs rebuilding or changing, though I know that the float needle set up on the early carbs can cause richness on their own through allowing inaccurate metering.

Re: series 2 150cc problem.

PostPosted: Mon Dec 03, 2018 10:27 pm
by pg42
Thanks for that. I'll tear the carb back down.