Hi all, apologies that my first post is a question but I'm posting this on behalf of my Dad who needs a little help trying to diagnose an issue with his 1968 750 Interceptor (I'm not sure he would know how to sign up and post on a forum
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The situation is that it appears to only be running on one cylinder, he says that the other cylinder does not run/fire at all (apologies if I have got any terminology wrong below).
He has replaced the ignition system with a Pazon system, both spark plugs have a strong spark and both spark at the same time.
The head has been replaced and checked.
It has new carbs , timed and jetted.
The cylinder which is not running is getting fuel as he says the plug is wet/comes out the exhaust on that side.
He carried out a compression test and both were good, the higher compression is actually on the side which does not run.
He's switched coils and carbs which makes no difference.
What is really strange is that he has tried switching the HT leads over (just the spark plug ends) and the problem does not follow the leads, the same cylinder continues to run.
The problem has baffled him and his friends for months now so I thought it may help to ask a wider audience.
Any suggestions appreciated, thanks!