Ok I just did that, I wound the stop down about 1/8 inch and set the slides to 0.8mm which gives me chance to drop them down. Also I found the needles were on the lowest setting so I put them in the middle, I will put in the 102.5 mains tomorrow.

Ok, thanks for that, I will give it a go this week. I’ve got the slide gap set at 0.8 mm (engine side) and the pilot jets set at 1 1/2 turns out. It was set like this the first time, but the revs were too high, and the throttle stop was right off.

At last I’ve got to the bottom of my problem, after fitting a borrowed set of carbs from Gus the bike ran ok. On inspection of my carbs I found the pilot fuel screws were in too far, I’m not sure how this happened because I set them to 1 3/4 turns out. The problem was that the tick over was too high...

No not really, I just want to know if the bike will rev past 3k, it doesn’t matter if it runs smooth or not.

Your right, they are 26mm. I just checked again

I’ve made sure that the valve timing is correct, unfortunately it made no difference.
I’m trying a different set of carbs next (thanks Gus)

Thanks for that, I’m going to try again tomorrow if I’ve got time.

I must apologise to Chris rooke, his book does say the pin above the arrow, I just took it that he ment the pin next to the arrow. Like you said, it would be better to say 29 from the arrow

Hi Kev, are you sure your diagram is correct? I thought the first pin was where the arrow was pointing.I’ve been using a book by Chris rooke and that’s what he said. The daft thing is I mistakenly had it right in the first place and I still had the same problem. Oh well I’d better put it right anywa...

Hi Chris, I checked and rechecked the cam timing. I got the arrow on the exhaust cam dead on the top of the engine block, then counted the 28 teeth. Then I checked several times again, Maybe I should have another go at it. Can you remember which way yours was out?

No I haven’t checked condensers. How do I check them?
I’ve just tried it with no air filter and no baffles, it reverse up to nearly 4k, when I refitted them it went back to 3k. Number 4 plug looked brownish, the rest black.

I have been offered a set to try, which I will when I’ve run out of other options. It’s odd that it will rev right up in neutral, but on the road it won’t. Seems like something is breaking down under load.

The pilot fuel screws are set about 1.25 turns out, I started at 1.5 but it was reving too high so I turned them in 1/4 turn.

Thanks for all your help, I really appreciate it. I hope I’m not being too much of a nuisance.
I’ll try a few thing tomorrow, it does seem like it’s air related.
Thanks again
Nick

I haven’t checked electrical fault under load, it’s got a new kill switch. Timing and auto advance ok, fuel ok. I set float levels when I overhauled the carbs, new coils. The plugs get very sooty, in a very short time. The only way I can rev past 3k is by feathering the throttle instead of just open...