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Time for a topend rubuild? What do I need?

  • Thread starter Thread starter UK-GT
  • Start date Start date
UK-GT said:
Job 1 Today: Carbs have been off and the camchain tensioner has been stripped and re-built, I did notice that their was no tension on the spring when I took it apart, it now has 1.5 turns on it, so that may be the cause of the rattle. Took me longer to get the carbs back on then to do rest!!

Job 2 Today: Rocker cover off. Measured valve/cam gap:

5 of the valves I could get a 0.04mm (smallest one I have got) gauge through but not 0.08mm
1 of the valves I could get a 0.04mm, 0.08mm and 1mm gauge through but no 1.2mm (0.04mm & 0.08mm together)
2 of the valves I could not get a 0.04mm gauge through but I could rotate the valves with my finger so they are probably about 0.02mm/0.03mm.

I have just ordered a new set of feeler gauges that go down to 0.02mm. I am not going to put the bike back together until the new gauge arrives.

I did take a shim out and measure it with my vernier caliper but its not that accurate, it looked like 2.4mm thick but it could be 2.35mm or 2.45mm!! Should I order some 2.35mm & 2.45mm shims or do you think it will be OK?

Andrew
Click to expand...

If you think your tight valves have about 2.4mm, I would order the next two sizes smaller and take an educated risk that they will work. You will only use smaller shims on your bike in the future. Oil loss probally isn't due to poor valve adjustment but adjustment is a must for good engine life and preformance.

The carbs are a bitch on these 650g's, aren't they! I feel your pain.

cg
 
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