1957 M16 not running properly
Posted: Sat Nov 10, 2018 8:43 pm
Can anyone please advise me on how to sort a problem out. I have recently bought a late '57 M16 (alternator model). It had been laid up for almost 25 years when I bought it. I am just going through bits and pieces before I put a ticket on it.
The first thing I did was to drop the oil out of the tank and sump, and refill it with new straight 40.
I've been through all the electrics and fixed all the dodgy connections, it charges well (recent battery) and all the lights are now working as they should.
I took the 376 carb apart, and cleaned it with carb cleaner, and blew it all out with a compressor. It's spotless inside and out. I have also replaced the float needle as the old one was a bit aged shall we say.
However, it isn't running correctly, and hoped someone might be able to point me in the right direction. It starts easily, and when it warms up it's better but not quite right. Unless I'm really gentle with the throttle it wants to die on low revs, then it behaves itself and revs ok. In other words it doesn't want to pull smoothly, then it's away.
It points to fuel I guess? The pilot jet is clear, and the petrol is getting through ok. I also cleaned the tank out, and replaced all the pipes and both taps. Obviously it has fresh petrol.
I have replaced the points, condenser and plug, and double checked the ignition timing as per the book. I even went out to buy fag papers for the job!
I set the throttle stop and mixture by ear, and the plug isn't sooty or oily.
Today I put it all back together, fired it up in the garage (to annoy the neighbours!) and it's still not 100%. Once you get through the rough bit it's away.
I will fiddle again tomorrow, but any advice would be much appreciated in case I've missed anything. I thought if I asked you nicely someone on here might see the glaringly obvious! I dare say I'll sleep on in and it might come to me.
Thanks in advance.
Andy
The first thing I did was to drop the oil out of the tank and sump, and refill it with new straight 40.
I've been through all the electrics and fixed all the dodgy connections, it charges well (recent battery) and all the lights are now working as they should.
I took the 376 carb apart, and cleaned it with carb cleaner, and blew it all out with a compressor. It's spotless inside and out. I have also replaced the float needle as the old one was a bit aged shall we say.
However, it isn't running correctly, and hoped someone might be able to point me in the right direction. It starts easily, and when it warms up it's better but not quite right. Unless I'm really gentle with the throttle it wants to die on low revs, then it behaves itself and revs ok. In other words it doesn't want to pull smoothly, then it's away.
It points to fuel I guess? The pilot jet is clear, and the petrol is getting through ok. I also cleaned the tank out, and replaced all the pipes and both taps. Obviously it has fresh petrol.
I have replaced the points, condenser and plug, and double checked the ignition timing as per the book. I even went out to buy fag papers for the job!
I set the throttle stop and mixture by ear, and the plug isn't sooty or oily.
Today I put it all back together, fired it up in the garage (to annoy the neighbours!) and it's still not 100%. Once you get through the rough bit it's away.
I will fiddle again tomorrow, but any advice would be much appreciated in case I've missed anything. I thought if I asked you nicely someone on here might see the glaringly obvious! I dare say I'll sleep on in and it might come to me.
Thanks in advance.
Andy