When I took my T300 marine engine walkies to the Wessex SEC Annual Rally on
Sunday last, it got all bothered & stopped on me. It then started again but
stopped in that rather final, sulky way so well known to those of us that
take up the care of Iron Charges. "I'm not going to run again until you have
paid attention and looked at me properly."
So today I took the carb off (it had dripped occasionally) and found
nothing. The float wasn't sunk, the needle valve shut off the flow of petrol
that itself was stopped & goed by the tap in proper fashion. All the jets
Out with the plugs. No-one could call the spark startling, but it was
present. Cleaning the points made no difference & a good light across them
showed they were as clean as points could very well be. The plugs are dry,
though & I thought it was running rich - certainly, it sounded like that,
misfiring at low RPM. I peered into the plug'oles to see the combustion
space - and discover long reach plug threads filled with long years of
carbon. Had short reach plugs in it when I got it & I never thought anything
I've got a plug tap somewhere, but could I find it? Naaa. The old trick of
two saw cuts along the thread of a scrap plug did the trick & a pair of
extended nose NGK's carry the dim spark out into the combustion chamber
where it does the most good.
Choke, tickle, wind - BRRRM! How satisfying. Now it runs cleanly instead of
going down on one at tick over as it always has done. Starts when hot & revs
better. Another problem solved - back on the shelf with it!
J. Kim Siddorn,
16 years ago