Thanks Rich
I might be being a bit 'pretentious' saying it is no an air leak as I have not done a 'leak down' test yet as I don't think (?) that it is an air leak.
Maybe I'm wrong but I will build a set of carbs very carefully first and then run with them. I spent a lot of time carefully re-building the motor so I'll go with the carbs first as (I have to admit) they did not get my 'full attention' on the re-build.
When I originally bought the bike she ws a bit of a sod to start and never returned to idle as quick as I would have liked. I'm still using the original carbs!

I was just interested in what the blanking' off of the power jets would do and I'm grateful for your information. I have two sets of extra carbs (one on a spare motor) and am starting to strip them down. One has power jets that have obviously been soldered but then re-drilled.

One question, where is the best place to get Keihin jets?

Thanks
Mike
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I don't mind dying...I just don't want to be there when it happens!