Cat 10 Won't Run, Ideas please?

Mick sounds like you have a vacume leak if runs with the choke on its getting to much air and it wont be spark at all and it s not fuel because you have changed carbys that only leaves the air hope this helps

Paul

Check the passage through the block, I have heard of these cracking and allowing crank case gas to dilute your air fuel mixture, also check the intake manifold, its possible there is a hole or crack on the inside that would cause the same problem. Needless to say a good seal between the intake and block is very important, I have had manifolds resurfaced on the same machine they use to surface cylinder heads (big surface grinder)

Is it possible the Governor Spring broke a coil?

[quote="Mick"]Hi There, I really need help with this one!


Has anyone got any suggestions why the governor may be pulling to no fuel even with desired throttle at high?

[/quote]

That's what governors do. The spring opens the throttle, the governor closes it. Is the spring broken or that weak that it can't overcome the governor? If the idle circuit in the carb is not working, the engine will start to die when the throttle closes, then the governor catches it & opens up...this repeats itself & the engine "hunts"...I agree with the others you may have a vacuum leak, it will cause the same effect.

Have you tried to override the governor and run the throttle linkage by hand at the carb? If it runs fine doing that, it could be a governor issue. But my suspicion is a vacuum leak. Easiest way to find out is to take a can of carb cleaner or ether and spray all around the intake manifold with the engine running (be careful for fire sources!). If the engine revs itself up while spraying, you've found your intake leak. Use the ether conservatively as ether has a LOT more punch than the gasoline, and can sometimes make the engine go knocka-knocka-bang-bang for a second as the stuff ignites in the cylinder. This is a very easy and safe method for finding an intake leak, but just remember a little goes a long way!! Hope this helps!

Hey Guys,
thanks for all the input. I will not get a chance to play with it again till friday.

Would anyone have any information on the governor? even a parts diagram, I have not pulled one down before.

When I had the throttle linkage off, the hand throttle to governor at high idle and the engine free revving towards a high idle, the governor was still pulling back to no fuel.

I think I have a combination of all the suggested faults, which is a bit scary!

I will post an outcome as soon as I look at it again,

thank you again

Mick.

Mick

I have new governor springs available for a Cat 10 if you need one

Hi Mick,
scan below is for a 15 but is essentially the same setup.
Left clicking on the scan a further twice will make it larger.
Hope this helps.
Cheers,
Eddie B.