fantastic, can't wait to see them. they come all the way from spain too
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for cheapness, try raising the needle first.
I'm assuming that you checked for air leaks inc vacuumm tube on the inlet system and the ignition timing is spot on
re-read your 1st question and it doesn't say why you need to have a richer mix. I assumed that because you were thinking of upping the mains as well as the pilot you were having an issue with the whole operating range of the bike!!
I did put a smaller mains in and raised the needle and i got a stronger mid to upper power and got extra MPG! with the US bikes it may be the other way round as the emissions are stricter.
i'd start by raising the mains needle 1 notch ( that's to lift the needle) if there are no grooves in the needle, put a washer under the needle base to raise it.
thats the point Kev, Its a long term project for my son for when he's 16.
Already got a suppiler (bob wright)and the spares situation is really healthy