Thorspark any info?

[B31Thumper]

Happy Easter everyone!

I'm having some running problems with my B31. It starts and idles perfectly but stutters and won't accelerate when you add throttle.  Initially, I thought it was an air leak in the carburettor. However, after rebuilding the carb with an Amal stay-up kit, it still doesn't perform as expected.

The B31 has a Thorspark electronic ignition kit with manual advance/retard and I'm wondering if the ignition might have wandered. I can't find any instructions for the Thorspark unit online so I'd appreciate any information anyone has.

Many thanks.

[V500]

I phoned Thorspark directly when I was having issues with a unit on a bike I'd just bought. I spoke to the owner and he emailed the fitting instructions etc. Nice bloke, but I wouldn't consider buying a Thorspark kit for any other bike, I'd just get the mag rebuilt.

[Pete C]

I have the fitting instructions for a magdyno system from Thorspark. Send me your email by DM and I'll forward it to you

Cheers
Pete

[scifi]

I can't see how it would be ignition, even if the advance / retard was out by 10 degrees.
If it cuts, as in no fuel, try lifting the needle a notch or two.   Have you altered the air-cleaner.?

[paulm]

Thornspark only eliminates condensor problems, the mag can still be faulty