Hi Jarek,
How many hours on the motor?
What is the colour of deposits on the exhaust like?
What is the compression like on #4?
Best Regards
Laurie
On Friday, 12 April 2019, 6:36:49 am AEST, Jarek Steliga
<[email protected]> wrote:
Hello,
I am at the end of my tether. Please help.
I screw in 4 brand new Limbach spark plugs. The engine runs smoothly. After a
while I detect vibrations, then check all the plugs and consistently one on
cylinder 4 is black (all the others look fine). When I screw the sooty plug in
on a different cylinder and run the engine, the plug will clean itself up (e.i.
burn all the soot and look like new). Conversely, a clean plug mounted on
cylinder 4 will foul up again. Has anyone had a similar situation? While
checking the fuel mixture with Gunson colourtune
https://www.youtube.com/watch?v=xEZ0-uN0NA4 , the mixture on cylinder 4 is
slightly richer (e.i. slightly too rich) than on cylinder 2. How can that be
when both cylinders are supplied by the same carburettor?
Looking forward to someone's suggestion
RegardsJarek
