Reply To: Valve clearance, camshaft, camshaft tensioner – a problem or a serious fault?

[Maciek]

My frustration is reaching its zenith…. Today after firing up the motorbike with the suction on, it ran reasonably cool and even. The sound of this regular metallic knocking continued, I was ausculting the engine with a screwdriver and gently gassing it and looking for any anomalies and this metallic sound was coming exactly from the rear cylinder, exactly this sound could be heard on the cylinder cover in the lower left year as you look at it from the top. As I was fitting a new drivetrain I decided to go for a round of literally one kilometre to see how it was performing and how the bike was going.

Overall it ran very well, it’s been a while since I’ve ridden it but it didn’t feel like it had a mule or anything. The only drawback I found was a mega vibration at high revs and a horrible noise from the front of the bike, as if something started to shake that wasn’t tightened and started to bang against something….

So I didn’t gas it up any higher and went back to the garage to check the pressure on the pistons and found I had 6kg/cm2 on both of them on a warmed up engine o.O

After checking and breaking down completely came the icing on the cake and while tightening the spark plug the threads came off and stayed in the cylinder (I was unscrewing them with a torque spanner)…. And these were new spark plugs bought….

Also, I still have a long way to go as I will probably have to strip the rear cylinder down to the smallest detail anyway to see if anything has fallen into the piston….front cylinderrear cylinderNew spark plug…

 

Also no fumes today, but I’m a little bit concern about this oil on this plug…