Jet sizes for pd 41a carbs

[Mag1]

I had my carbs refurbed by a friend a while ago using the carb repair kit from Dss, the jet that came with the set is #155, looking through the specs I can't find what was the original size jet only us specs which state that a 1977 cb750 are 115. Which is the correct standard size?. I have 4 into 1 and race cone exhaust with standard air filter. Any recommendations of jet sizes I should use?. When I started the bike a few weeks ago it ran fine, just backfired at higher revs, but that was down to no air box fitted. Any help will be greatly received. Maybe 120, or 130 jets?

[Spitfire]

Here you go


Cheers

Dennis

[Mag1]

Cheers Dennis, looks like same as us bikes then #115 jets.

[petermigreen]

Wow what a great chart.
Does the JN column refer to the needle clip position. I'm guessing this is number of notches from the top?
Peter.

[Spitfire]

Yes it's a handy chart I think I got it from the US site, I think that JN is Jet Needle so will be specifying the needle position.

Cheers

Dennis

[petermigreen]

Thanks, quite serendipitous as I'm moving my clip positions on my 500 this very night as I blindly put them in the wrong position when I reassembled the carbs some time ago and was experiencing bog down on acceleration. Great!
Peter