More CB750 fun

Timo Geusch wrote:

> Nick Wilson wrote:
>
> > So, gentlemen, the story so far is that my CB750 carbs were blocked.
> > I took them off and cleaned out the jets - three jets per carb.
> >
> > Still doesn't work. It runs fine on easystart - if I keep spraying
> > it runs continuously.
> >
> > Did I miss something in the carbs? What else could it be? I guess
> > easystart is a lot easier to ignite and maybe a very weak spark will
> > let it run on easystart but not petrol?
>
> Did you check the spark? Do you have ample compression?
>
> > Is this likely or should I be looking at the carbs again?
>
> If they were completely gunged up, yes.

Easy way to check the spark is to remove a plug cap from one plug and
put a spare plug in it, rest this on the engine and try starting it, if
there is a spark all OK, if not the ignition needs a look make sure the
spark is a big fat blue one.

--
XJ600S

Nick Wilson wrote in message

> So, gentlemen, the story so far is that my CB750 carbs were blocked. I
> took them off and cleaned out the jets - three jets per carb.
>
> Still doesn't work. It runs fine on easystart - if I keep spraying it
> runs continuously.
>
> Did I miss something in the carbs? What else could it be?

Honestly, with modern carbs if all the petrol in the floatbowl has
evaporated due to storage the only way to get the buggers working again is
with an Ultrasonic cleaner.
A few years ago I bought a GS500 that the owner had stuck in a shed with the
petcock set on prime
About 2 gall of petrol had evaporated through the carbs, that's when I
bought my first Ultrasonic cleaner.


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