Simon -
Have you still got the original gulp valve (pcv valve) in the system? If
so, check for a small leak in the diaphragm. It could be compensated for by
richening mixture if it's not too big. That could possibly give you what
you're describing. Another thing to check is intake manifold to head
tightness. There's better clamping in the center than the ends.
Fred Hodgson
----- Original Message -----
From: Simon Rasmussen
Sent: Tuesday, May 20, 2003 8:35 AM
To: Friends of Triumph
Subject: Rich mixture on 2&3
I hope someone on the list can offer an explanation and solution to a problem
I've never seen before.
My TR4A is running rich withg sooty black plugs on cylinders 2 and 3, but
perfect coffee with triple cream colour on 1 and 4. This can't be carb
adjustment since either the front or back pair should be affected. I also
don't think it's oil since the valves and guides are nearly new, about 3,000
miles and the exhaust does not seem smokey.
I had the head off over the winter, the problem was obvious from the colour
of
the valves, and I noticed a couple of stripped studs on the exhaust header,
which I replaced and tightened up properly, but there's no improvement.
Any insights or suggestions welcomed. Thanks.
Simon, WOFTAM Racing.
Regards,
Simon Rasmussen
Sales Manager - Telephones To Go
Email: Simon@TelephonesToGo.ca
Mobile: (416) 565-0031
Tel: (416) 650-0000
Fax: (416) 650-5751
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