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Engine keeps cutting out

Technical help for all early models, A, B, C, LC, D, LD, E & F models

Engine keeps cutting out

Postby pg42 » Fri Jun 01, 2018 4:21 pm

I have a 1957 Ser3 150cc Ld. Recently replaced plug, points and condensor. Also had the tank professionly cleaned and resealed. Engine starts, runs and ticks over fine. After about 20 minutes riding under steady throttle, the engine just dies. Leave it for 10 minutes and it will start and drive for a while then cut out again. Almost sounds like overheating. Any suggestions please. (legal ,achievable only please!).
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Re: Engine keeps cutting out

Postby MickYork » Fri Jun 01, 2018 4:34 pm

When it dies check the plug, is it wet ? if dry could be fuel issue.

With plug out have you got a spark ? no spark/electrical.

Obviously not going to be as simple as that but the plug may give an indication of whether it's fuel or electrical.
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Re: Engine keeps cutting out

Postby Digger » Sat Jun 02, 2018 7:05 am

Checked the petrol cap breather hole?
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Re: Engine keeps cutting out

Postby Steve J » Sat Jun 02, 2018 10:48 am

Breather hole? That reminds me - almost all LDs have the usual breather hole in the filler cap, but some of the late Mk3s have a separate metal vent tube that runs down inside the tank and exits underneath. Those have a filler cap with no vent hole - just make sure your tank is the type with the separate breather if you have no vent hole in the filler cap!

If that's not the problem, it might be worth checking the HT coil, these can give an intermittent fault when they get hot, but seem to work OK once they've cooled down. Similar problem can occur with the condenser - just because it's new doesn't mean it's not faulty!
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Re: Engine keeps cutting out

Postby pg42 » Sun Jun 03, 2018 10:18 am

Thank you all. Lots of backing for some of my own theories. Busy weekend me thinks.
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Re: Engine keeps cutting out

Postby jbcollier » Fri Jun 22, 2018 1:35 pm

Classic sign of a failing condenser as well.
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Re: Engine keeps cutting out

Postby AAVlover » Sat Jun 30, 2018 1:56 pm

Hi pg42, did you sort it out as I've posted a very similar problem?
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