extremely black sootie exhaust pipes

blompod · 21 Dec 2014, 11:34 am

Is this an indication that it is running far too rich? Shouldnt the pipes be a nice gray colour? Ive ordered the brass bushes for the throttle shaft in the carbie because it does have an air leak there, once thats done should I lean out the air mixure screw? assuming that is been set rich to compensate for the air leak. 😊

Bizarre · 21 Dec 2014, 11:41 am

Yes-ish. Black and sooty is indication of richness. But most of those rules come from leaded fuel days.
What colour are your plugs?

Any air leaks will stuff any chance of sensibility.

Get everything sorted and then start tuning from a base line.

blompod · 22 Dec 2014, 7:04 pm

I havent checked my plugs but will do, also can solex carbies heal themselves? I had a wicked air leak around my throttle shaft but now shes running sweet and the air leak seems to have disappeared according to the WD40 test. Should I bush it now or let sleeping dogs lie?

HappyDaze · 22 Dec 2014, 7:21 pm

Amazing stuff, that WD40.👍

Newt · 22 Dec 2014, 8:22 pm

'Scuse my ignorance, but what does WD40 do?

Cheers

Newt

Bizarre · 22 Dec 2014, 8:34 pm

Temporarily seals the leak and there will be a change in revs

psimitar · 22 Dec 2014, 10:39 pm

Bizarre wrote:Temporarily seals the leak and there will be a change in revs

If the leak is small enough that the WD40 film thickness seals the leak the WD40 test will work.

In the old days we used an oil can with some generic 20W50 in to do these tests. Now that used to plug most leaks very well indeed 🙂

OP, if the throttle shaft is still sloppy in any direction then they need replacing. I'm afraid inorganic objects do not magically heal 🙂

blompod · 22 Dec 2014, 10:50 pm

Yeah the revs the other day would raise as soon as you sprayed the throttle shaft, I think carbie cleaner works better for finding a leak, more flammable I guess. But yes Im sure it will come back again so I'll install the brass bushes when they arrive. Someone mentioned these bushes on another thread, do they work well? They dont make the pedal heavy by tightening the shaft???

Bizarre · 23 Dec 2014, 8:58 am

blompod wrote:They dont make the pedal heavy by tightening the shaft???

They take it back to how it was originally built

The original bushing has worn.

psimitar · 23 Dec 2014, 1:27 pm

blompod wrote:Yeah the revs the other day would raise as soon as you sprayed the throttle shaft, I think carbie cleaner works better for finding a leak, more flammable I guess. But yes Im sure it will come back again so I'll install the brass bushes when they arrive. Someone mentioned these bushes on another thread, do they work well? They dont make the pedal heavy by tightening the shaft???

They shouldn't tighten things but after you put them in you'll know pretty quick with the shaft back in and turning it.

If it does tighten then it'll need reaming so the shaft spins freely.