fontyyy wrote:
Measurements, there's no mention of replacing major parts by milage in the NSR250 workshop manual.
There are however figures for everything, cylinder size, out of round, warpage, piston size, ring gap, pin and pin bore size, ring to ring grove clearance, crank clearance and run out.
How odd, so there is no maintenance schedule for checking piston size, bore shape, crank tolerances. Just the figures?
I see you have a race bike, what sort of maintenance schedule do you stick to out of interest? I was sticking to top end every meeting (check) and full strip every 4 meetings (replacing some parts; rings and some seals usually).
doug3 wrote:
OK. Thanks for your discussions. Assuring in some sense. I was looking at photos of used cranks for sale and found that they mostly had the same appearance as mine, so I became less concerned about the coloring.
As the servo motor had stripped out, I did find that one of the rc valves was binding a little when moved by hand. It did not seem too serious, and after moving it back and forth several times with a little bit of lateral pressure on the shaft, it became quite smooth.
However, I must suspect that it froze up enough to cause the cable to stick, thus stripping off the plastic teeth of the gear in the servo motor. So... I will at least pull the cylinders to find out what the condition of rc valves, pistons, cylinders, etc., actually is.
And I received my new MC21 Service Manual in the post today, so I am ready to get down to it!
Glad the crank is ok, bit expensive to replace although with your location you'll probably find a replacement easier than us in the uk!
Its a good idea to have a look in the engine, just so your happy with whats going on in there
Service manual looks useful too! Wish I had one for mine...
Cheers
Paul