3rd exhaust pipe a bit cooler than the others

[unfazed]

[quote author=unfazed link=topic=8445.msg83280#msg83280 date=1371941368]
If it was coils the it would effect 2 and 3.
Swap the plug in cylinder 3 with the plug in cylinder 4? It might be a plug breaking down.
If plugs are ok, then it is carburettor, incorrect valve clearances or piston ring issuses associated with cylinder 3. Would not be the first time someone mixed the shims up when doing the clearances.
A compression check will rule out carburettor being a problem.
Teedeelii;
Check the valve clearances and then synch the carbs. Might be no harm to do a compression check also.

Have swapped plugs 3 & 4 - same, 3 doesn't work even with the plug that was working in 4. 4 was working with the plug from 3. So plugs must be OK?

2nd cylinder works, so coils must be OK?

Coud it be the cam chain not fittet properly (timing)?
Or the carbs?


Valve clearances were OK, nothing was touched.
[/quote]
Back to the carbs then.
Use a piece of clear plastic pipe on the float bowl drain outlet to check the float level before you remove the carbs.
With the pipe on the outlet open the drain screw allow some fuel to drain out the pipe hold the pipe up next to the float bowl, Tape it in place or get some one to hold it. Now start the engine. The fuel in the pipe should settle around the top of the float bowl. with the engine running lower the pipe allowing some fuel to drain out and put it back next to the bowl again. Fuel should settle quickley to the correct level again.
If the above is ok it rules out a sticking float or blocked float valve.
When checking the jets and orifices always blow then out in the reverse direction of the normal flow. Any loose dirt is blown out the way it came in and not blown further in to become pernamently stuck.