So selling the MV may be a 'non starter'.......

[Lord Danoir the first]

fucking....... literally

So I've been doing some cosmetic work on it since I got my blast cabinet......... but having noticed an ever so slight rattle, I decided to address what appears to be a notorious cam chain tensioner issue.

First job is to remove the tensioner (lock wiring the chain to the cam sprocets) and clean and check it for cracks....... mine was fine so I re-fitted it...... the recommendation is that you slide the tensioner arm all the way in, then turn the crank by hand so the tension re-sets....... so I did that.

BUT....... being paranoid, I ordered a new tensioner anyway..... not fucking cheap and took ages to come, but I had bits to sort anyway, so no problem.

New tensioner arrives and I notice right away that the spring effort is WAY stronger than the existing....... so, glad I'd sorted a new one, I fitted that.

Everything back together and, can I get the blighter to start?....... can I fuck!...... just won't fire..... injectors working and there's a decent spark.

anyway, big do's and little do's, the cam timing is way off......... I suspect what's happened is that when I've rotated the engine with the existing tensioner back in, the spring hasn't pushed the tensioner slider with enough force and the chain has slipped......... FUUUUUUUUUUUUCK!!!!

Now, a few things appear to be in my favour, you may disagree so feel free to weigh in:

1. The engine turned, and still turns freely by hand with the new tensioner in.

2. It also turns freely by starter with no mechanical noises.

3. The cam lobe gaps are all within factory range, suggesting no bent stems.

I'm aware that even a little contact will cause issues, but I'm going to reset the cams and hope to Christ I got away with it.

Wish me luck.

[terry950sm]

If you need help. I have a motorcycle mechanic friend that has good knowledge of MVs

[Lord Danoir the first]

If you need help. I have a motorcycle mechanic friend that has good knowledge of MVs

That will be my next course of action. If it's damaged, it'll be off to someone who knows the know

I'll be in touch.

[Kitb4460]

I wish you luck.

That is all gobbly gook to me. Engine stuff is wayyyy out of my zone of things i can do ( Fuck up )

[Green_Ninja]

Back to basics, check/set cam timing, fit new tensioner, rotate engine by hand, if it feels OK try to start it - PRAY. Good luck.

[DaveH]

Have you tried new plugs?

Would the chain jump if just being turned at low speed by hand? Would've thought you'd have felt/heard it, no?

Only reason I mentioned new plugs is that years ago I had done some work on my bike and it refused to start; fuel getting through, good spark at the right time and plugs weren't that old.

Changed the plugs as a last resort and it fired up.

[Lord Danoir the first]

Always change the plugs following a similar situation years ago....... it's definitely jumped, the timing's out on the markers.

[David W]

Have you broken it?

[Lord Danoir the first]

Have you broken it?

I don't think so.......