Spark plug drain holes

[darrsi]

[quote author=His Dudeness link=topic=24802.msg291055#msg291055 date=1548096933]
[quote author=Fazerider link=topic=24802.msg291031#msg291031 date=1548064157]

Lack of time meant I only got back to this yesterday and only for a couple of hours.
I’d ordered a 10mm x 1mm tap which extracted an astonishing amount of grit from the plug hole. That explains why it needed so much torque to get the plug out… I was surprised it didn’t shear off.
With the plug hole blocked off to stop debris dropping in it was then possible to clear the drain hole between the two plug wells. No way would an air line have done the job, the passage was stuffed with tight packed oily grit and needed a long drill bit to dig it all out.
Still have to persuade plug 2 to come out in one piece then I can clean out that thread... and then there's the right hand half of the engine, which is likely to be worse.

The right side will most likely be worse. The bike leans to the left on the side stand so the left side of the engine points down and has a chance to drain whereas the right side points up so all the rain water and dirt collects on that side around the spark plugs. Take your time when you're undoing those plugs and clean the area as best you can. Sometimes working the plugs in and out with a bit of oil helps to clear the threads
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Yes, I’ve left a mixture of oil and WD40  soaking plug 2 which I only managed to shift by half a turn before my courage ran out. The force needed to move it that far was alarming.
On the upside, it was a pleasure to screw plug 1 into its lovely clean hole: smooth and easy all the way in. :b
I wish Yamaha had drilled independent drain holes for plugs 2 & 3, the fact that the outermost plugs are in the way makes clearing the passageways very difficult. I bet practically every FZS600 out there (apart from Fazersharp’s) has them blocked.
Even better, of course, would be if Yamaha had devised a seal that completely closed the area off from rain and dirt.
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Even one of those rubber piss flaps covering the right side, as well as the front, would no doubt be a major help in stopping rust, blockages, etc.
Would have to be cosmetically easy on the eye of course, so an extension of the fairing would've sufficed too.
Obviously all avoided by using the centre stand, but not entirely practical in comparison.