carburettor problem?

[MartinA]

Hi

My R4 has been standing for over 18 months for various reasons. I have now managed to get it to start but only on full choke, it then runs at full revs. I have taken the carburettor off and cleaned it out (full of crud) made no difference. I fitted a replacement carb - same issue.

Any ideas?

Regards

Martin

 

[André4Renaults]

How old is the petrol? Perhaps it's stale. Plenty of other thoughts, but I thought I'd start with an obvious one! My apologies in advance if you've thought of this!

 

[malcolm]

It should run at high revs (maybe 2000rpm) on full choke but not full revs (I'm imagining 5000rpm). If you are experiencing full revs then the throttle cable is probably stuck somewhere. Worth a mechanical check on the throttle to make sure it's doing what it should.

 

[MartinA]

Maybe not full revs and if the choke is pushed in a little the revs go down a bit.

 

[reidalpine]

depending a bit on your outdoor temp.but all normal to have to give it some choke,this will make the motor run faster on start-up
after some min's push choke gradually in as motor warms up. this all sound as should be to me. -Reid.

 

[Homegrown]

If it's your second carburettor set up and still not working, you propably have air leak between carb and cylinder head.
Can be gaskets at flanges or airleak in some pipes under carb throttle (vacuum line or emission pipes).
Would explain why problem till is there after change carb.
Full choke gives extra fuel.
External air leak gives extra air.
These two combined makes engine too lean without choke and ok air/fuel mix with full choke but high revs due to the air leak.
If carb or manifold have any external piping start plugg them, if symptom still there try to have car on choke so it's running on "tickover" balance choke to lowest possible rpm but still running. The you spray start gas on possible leaking gaskets if rpm alters then you have found your leak.
Hope this gives you something to move you forward in making your car work properly.

 

[André4Renaults]

To ascertain if there's an air leak from the gaskets between the carburettor and the inlet manifold, first get the engine running even if you have to have the choke out to do it. Then spray WD40 or a similar product around the joints. If the engine revs alter (it doesn't matter if they go up or down, just that they alter) then there's a leak there! Once you know this is a problem you can focus on fixing it.

As an aside, whereabouts in Devon are you? I was born in Barnstaple!

 

[MartinA]

Thanks. I am in Clayhanger a hamlet 5 miles from Bampton.