After longer time (I had to find energy to start it
) update
Issue No1 (camsshaft/rocker arm) (see my first post for details)
Today I removed valve/cam cover to check IN#1 rocker
What I found surprised me (!?)
- IN rocker arm #1 has uneven wear (arm was touching cam only partially), at least half part of contact surface is not showing any wear at all. Seems issue is present since new bike
- Cam IN#1 lobe shows strong wear (pitting incl) where arm was riding. Rest of contact surface does not show any wear
- Deeper inspection revealed issue comes from worn outside rocker arm shaft hole! Hard to believe but yes...
- Comparing how "deep" are shafts for IN#1 and othher shafts (EX#1, IN#4, EX#4) "buried" in valve cover, I found IN#1 is approx 2mm "deeper". Route cause comes from IN#2 shaft too "deep" and consequently IN#1 shaft too deep too that finally meant too narrow seat.
Shafts are all OK otherwise (forgot to take pics), incl IN#1. There does not look to be any issue with engine lubrication, all other cam lobes, cam bearings, rocker arms shows minimal wear I think (see pics).
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My conclusion is that issue is present practically from new bike, camshart to be repaired/replaced, rocker arm to be replaced, valve cover to be replaced, ideally with new improved type
Issue No2 (identified in previous posts here are probably worn primary chain)
I removed oil pan, see video of primary chain. Looks worn too much or not?
https://youtu.be/a1k28x_15lQNow, question to experts here:
- I assume cam lobe shall be repairable (hardwelding, grinding), but when I have it open, I'm thinking about alternative cam (something like Web Cam 358a or cam from CB650?) - what's your view on these cams and their effect on riding? Repair of my cam won't be for free anyway (if I find somebody to do the job).
- how to inspect cam chain and tensioner properly, having removed valve cover? Or, do I need to remove head/cyls too?
This will drive my next steps - if I'll continue stripping or "just" fix cam/rocker issue.