Stiff rocker arms and no valve gap adjustment possible?

[Fanum]

Still trying to cure my running problem

Set LHS side first today.....Rocker endfloat to .10 mm, then the valves, no problems.

On the RHS though, I noticed that the rocker arm (in particular, the inlet side) was stiff......and there was hardly any valve clearance or movement, even at TDC....with the support bar loosened right off, there was still barely enough adjustment on the valves available, and the left hand (inlet) rocker was stiff on its shaft (Normally, you have to hold up the rocker arm with a finger to set the float gap)

With the support bar re-tightened, there was no gap to be had, even with the collets fully unwound

So...opinions please?

Push rods can't have grown longer, and this is probably not related to the engine disaster I had (if you remember parts of this saga, the bike ran perfectly for 100 miles at one point) where the left hand pot, piston and rockers etc were all replaced.

The valve springs all appear to be ok.

I'm wondering if somehow, the rocker arm shaft has become bent.....if it's bowed out a bit, maybe that would cause both the stiffness of the rocker arm on it and the lack of valve adjustment space?

I'm seriously hoping it's a top end problem rather than a camshaft problem......it does only seem to be affecting the RHS, so I can't imagine how it would be bent /warped and not affecting the LHS as well

I'm seriously fekked off at this stage...it's been going on for two years and has resulted in a complete change of fuel system, most of the electrics and so on......but I guess it's good news that at last, I've found what could be the core problem that makes sense of most of the symptoms.

Suggestions very welcome

 

[Timolgra]

Take it apart Bill and have a good look.
You may even be able to get your hands on a 2nd hand rocker assembly.

Remember when you first started having problems and the valve clearance changed shortly after being adjusted?

 

[Steptoe]

Still trying to cure my running problem

Set LHS side first today.....Rocker endfloat to .10 mm, then the valves, no problems.

On the RHS though, I noticed that the rocker arm (in particular, the inlet side) was stiff......and there was hardly any valve clearance or movement, even at TDC....with the support bar loosened right off, there was still barely enough adjustment on the valves available, and the left hand (inlet) rocker was stiff on its shaft (Normally, you have to hold up the rocker arm with a finger to set the float gap)

With the support bar re-tightened, there was no gap to be had, even with the collets fully unwound

So...opinions please?

Push rods can't have grown longer, and this is probably not related to the engine disaster I had (if you remember parts of this saga, the bike ran perfectly for 100 miles at one point) where the left hand pot, piston and rockers etc were all replaced.

The valve springs all appear to be ok.

I'm wondering if somehow, the rocker arm shaft has become bent.....if it's bowed out a bit, maybe that would cause both the stiffness of the rocker arm on it and the lack of valve adjustment space?

I'm seriously hoping it's a top end problem rather than a camshaft problem......it does only seem to be affecting the RHS, so I can't imagine how it would be bent /warped and not affecting the LHS as well

I'm seriously fekked off at this stage...it's been going on for two years and has resulted in a complete change of fuel system, most of the electrics and so on......but I guess it's good news that at last, I've found what could be the core problem that makes sense of most of the symptoms.

Suggestions very welcome

The righthand side was all ok when we last adjusted the L/h side here.

 

[Fanum]

Take it apart Bill and have a good look.
You may even be able to get your hands on a 2nd hand rocker assembly.

Remember when you first started having problems and the valve clearance changed shortly after being adjusted?

Yes, and that's worrying me.

The righthand side was all ok when we last adjusted the L/h side here.

It was, but if you remember Neil, there was a problem found before where the RHS had no adjustment /very small gaps.

I can't help thinking there's an underlying problem in the rocker gear somehow, but I can't see why or what's caused it.

Will strip it down tomorrow and see what else pops up

 

[Timolgra]

The cam bushing may also have worn, you can only really check that by stripping it. Just giving a wiggle will tell you nothing.......of course your valves may just be working their way into the head