Limiting to 4,500 revs

[OldCroc]

IMHO if the plugs work at low revs they should do the same at high revs - highly unlikely that 4 electrical components will fail at the same time.
I favour the idea of a fuel filter clogged with the oily residue found in diesel. I think the fuel filter has a very fine element and if this is a little clogged it may be sufficient to allow fueling for low revs but not high. It seems to me that it has to be something mechanical or physical rather than electronic. FWIW

OldCroc

 

[ebbo]

IMHO if the plugs work at low revs they should do the same at high revs - highly unlikely that 4 electrical components will fail at the same time.
I favour the idea of a fuel filter clogged with the oily residue found in diesel. I think the fuel filter has a very fine element and if this is a little clogged it may be sufficient to allow fueling for low revs but not high. It seems to me that it has to be something mechanical or physical rather than electronic. FWIW

OldCroc

I know what you mean OldCrock, If it had carbs we'd have whipped off the float bowls and blown the jets out

 

[Chris7]

FIXED the problem - at Barry Robsons

When I removed the spark plug cap, I failed to fully put it back on.
For some unknow reason the bike limited at 5,000 revs.
Robsons said they fully pushed it home and it ran as good as ever.

Still dont understand why it ran perfect yp to 5,000 revs with full torque and accellerationm tghen stopped at 5,000 revs, you wopuld have thought the other side would have pulled it past 5,000 revs. Unless that clever ECU recognised the fault and was in some limp home mode??

Why are bikes so clever, but their again it never came up on the display that I was a dick for filling it with deisel in the fisrt place, thanks to BP Fuel station showing Ultimate Unleaded on the front of the fuel pump but serving Ultimate Diesel when I used the pump itslf - I know poor excuse?

 

[BeemerBaz]

Nice to hear you resolved the issue. I am paranoid about doing the very same thing when I go abroad.

 

[pathfinder]

IMHO if the plugs work at low revs they should do the same at high revs - highly unlikely that 4 electrical components will fail at the same time.
I favour the idea of a fuel filter clogged with the oily residue found in diesel. I think the fuel filter has a very fine element and if this is a little clogged it may be sufficient to allow fueling for low revs but not high. It seems to me that it has to be something mechanical or physical rather than electronic. FWIW

OldCroc

You are right!

 

[Owen Snell]

When I removed the spark plug cap, I failed to fully put it back on.
For some unknown reason the bike limited at 5,000 revs.....

The fuel in the cylinder burns from the spark and through the mixture on a flame front. This has a burn speed, the fuel does not ignite all in one go. The mixture is also a factor, the leaner mixture's flame speed being slower and so taking longer for the burn to be complete.

It is likely that the twin spark arrangement on the 1200 engine is needed to create 2 flame fronts so that the mixture can fully burn in the time available.

Obviously at higher revs, the available burn time is decreased and so as the revs increase the problems of running on 1 plug will increase. It may be that at 4,500 - 5,000 revs the exhaust gas sensors were showing too much unburnt mixture on one side and the ECU decided to stop the show at that point.