Zenith Carb adjustments

Andy I have a few old B belts of around that length. Let me have the exact measurement off-group as I'm supposed to be visiting you soon I think :-) regards Roland

Did you find the manual on Internal Fire site? That might have some instructions on carb twiddledge.

Just had a look myself and manual is clearly for a different set - genny to one side of engine and updraft Zenith with apparently nothing to twiddle at all - how dull!

B section belts are available from most bearing/power transmission suppliers. They will need the length of the belt though. Avoid the rubber tube type called Redthane. It stretches forever.

John

Yes I was a little disapointed too, but I have found the manual useful for other bits and bobs.

Thanks again all.

Ag

I have no particular knowledge of this sort of carb, are there many screws to twiddle? Usually these fairly basic instruments only run to a throttle stop and an air bleed for idle mixture adjustment - everything else is just a matter of having the correct (and unworn) jets fitted.

No, 'idle' in this context means running light but at governed speed rather than a car style tickover. If it's sitting steady on the governor and not misfiring or hunting up and down then it's probably not far off the mark - if not, then twiddle 'till it does!

(BTW I prefer SU's as well!)

Ah so it's an air bleed then! So what is the pratice to adjust that then (there doesn't seem to be anything else I can fiddle with :-(, But then again it's probably for the best!)?

I suppose the govverner will have to be disconnected to adjust the idle (unless you can call the governed 2000rpm idle!?).

Andy G

Well she certainly misfires at the moment! So I'll have a fiddle and see how much worse I can make her run :-))

Thanks

Andy G

Kim seem to have the monopoly on these, viz Parsons engine and I think a Reliant powered genset. But there are probably others as well.

========= Sometimes differentiated over here as "high idle" or "low idle".

Jack Watson

This should probably be on a separate thread but were SU's ever fitted to stationary engines? I prefer them as well, particularly when more than one is used on an engine.

John