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series 2 150cc problem.

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series 2 150cc problem.

Postby pg42 » Mon Dec 03, 2018 7:38 pm

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.
pg42
 
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Re: series 2 150cc problem.

Postby Warkton Tornado No.1 » Mon Dec 03, 2018 8:31 pm

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.
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Re: series 2 150cc problem.

Postby pg42 » Mon Dec 03, 2018 10:27 pm

Thanks for that. I'll tear the carb back down.
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