Suzuki Club UK

I have a 413 with an su carb on Rockwatt manifold. The sj seems down on power, doesn't really like hills and tops out at 50mph. I'm running a rocklobster if that makes a difference. By looking at previous posts, I'm led to believe this is a timing issue, so

1, is it a timing issue?
2, what should the timing be with my setup? Is it the same as a standard carb??

Thanks, Neil

I'll be honest, I'm running a weber with a rocklobster and top speed is about the same, when i took it on the motorway lorries were over taking me! What size tyres have you got?

Mine is running well with standard timing on a 1.6.

How well tuned is the carb? What needle and spring are you running?

Thanks for the replies!

I have a BDL needle & red spring

Tyres are 235/75 15's. I was hoping to go to 31"s but am a bit reluctant now if that's all the power i'm going to get.

What is your timing set at? Was it set with the idle at the correct speed, the vacuum advance disconnected and blocked off?

I definitely blanked the vac advance off. I think the timing was 10 degrees and the idle was around 800

As long as there's no pre-ignition that should be fine

Maybe the mixture is out, should easily be able do over 50mph on that size tyre.

Mines on 235/75r15 too, I thought my issue was that I needed bigger tyres, the gearing is too low for what I do, i was going to put my original transfer box back in, maybe mine has a running issue too?

Have you checked that it advances correctly when revved?

Turns out timing & mixture were fine. 6 month old spark plug with < 500 miles on it was knackered.

Runs much better now, but good to know it'll still do 50mph on 3 cylinders!

Thanks for the help though