Q&A: Possible causes of occasional backfiring of old BMW Motorbike?

4631582965 8b5b368ef5 m Q&A: Possible causes of occasional backfiring of old BMW Motorbike?
by Giulio Menna

Question by pgw1: Possible causes of occasional backfiring of old BMW Motorbike?
I have a ’56 BMW motorbike that has started to backfire occasionally on deceleration. This ranges from a moderate pfft to a loud blap. I’m unable to find the cause maybe someone has some suggestions as to the cause. The bike itself is running the best it’s ever run except for this.

Best answer:

Answer by oodlesoanimals
Backfiring is usually an electrical problem….or it could be a gas prob. but more than likely electrical.
First try to do the easy stuff.
Like check your plug wires and make sure that they are on tight and aren’t broken anywhere.
check your timing….this could be the problem
have your coil(s) checked
is it getting enough gas?
Sounds like you’ve been working on it for awhile now and are so close to havin’ it purr like a kitty.
Just go back through everything and don’t leave anything out or skip over anything.
Seriously, start at square 1 and go from there.
If you do it step by step and not take any shortcuts you should be able to figure it out.
And if you start to get ‘upset’ about how things are not going…then you really need to take a break and get away from it for awhile. Sometimes when you take time away what ever is wrong will pop into your head. And it really doesn’t hurt to get away from it every now and then anyway.
Good luck to you, it seems that you’ll be riding before too long.

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