28-07-16, 04:50 AM
(22-07-16, 08:10 PM)YamFazFan link Wrote: [quote author=7uckyDog link=topic=20641.msg237746#msg237746 date=1469134779]
It sounds like it doesn't run on all 4 when idling and in low RPMs, but mid range and top is great. It passed MOT today and since I was at the shop they checked the temperature on each cylinder, 3 & 4 are running much cooler than the rest.
That's just how mine was running up until a few weeks ago (except it was only cooler on down-pipe number 3).
The workshop did an ultrasonic clean of the carbs and also fitted a new set of spark plugs.
Apparently the main culprit was a blocked primary jet in number 3 carb.
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I have changed the plug caps which didn't make a difference but at least now I'll know I won't get a misfire from there. While I was at it I took the plugs out and #4 was a tiny bit whiter than the rest. If I recall correctly then that's a sign of a lean mixture.
I think I will finally find some time tomorrow to rip the carbs off once again and inspect those jets. They have been cleaned with a carb cleaner twice already and air did flow through them and the channels in the carbs.
So could there be an accumulation of dirt that formed some kind of a lime scale that could make those narrow channels even smaller to a point of being too narrow and the only way to clean them out would be by ultrasonic? Was it the cleaning of the jets or the cleaning of the carbs that solved the problem?