Forum

[Madoc]

My mates Enfield 500.
Misfiring.
I changed the plug three or four times, lead a few times, cap and then coil.
We swapped over the Boyer, and I retimed it ,which made a big difference but it's still doing it.
I have had the carb apart and also wired in a new ignition switch.
Charging is good .

Mystified now... So far about 7 hours .. Lucky I'm not charging eh

[PeteF]

Battery voltage OK?

[Cafeman]

Is it missing at idle, under throttle, cruising? Plug color is? Voltage checked going to ignition? Valves adjusted, good compression, air screw on carb set at 1 1/2 turns out from seated and fine tuned from there? I hate miss firing, especially on a multi cylinder engine, but a single should be easy to sort. Good luck.

[Madoc]

It's missing across the range ...

I tried my new cb550 battery on there
Compression and clearances are good.

I do wonder about intermittant voltage .. Might run a direct power to the coil... I did wire in a new switch for him ..

[Madoc]

It's missing across the range ...

I tried my new cb550 battery on there
Compression and clearances are good.

I do wonder about intermittant voltage .. Might run a direct power to the coil... I did wire in a new switch for him ..

[Norm]

Very hard to pick but have you changed the condensor, seems like you have changed everything else

[PeteF]

Are you sure it's ignition? Sticky valve?

[Leon Novello]

Sounds like symptoms of an air leak, check the rubber manifold connecting hose between the carburettor and cylinder head carefully for a split, it might even be under the retaining bands.

[Gwilly]

Plus one with Leon, also check the gasket between the actual intake boss and the cylinder head...

Spitbacks have been known to blow out a section of the thinnest bit of the gasket....

Will play up across the range except full throttle...