Hi GUy's have a problem with my powervalve servo on my 21 race bike.
After insalling the engine after a rebuild the servo motor cycle's fine but will not turn all the way to the Hi mark??. A powervalve cable did jam on the engine as I was removing it so I'm thinking I may have damaged it then??when it rotates to the lo mark it seems to be below the lo indicator point??
Any Ideas.
Cheers
Anthony

HI Guy's
I've tried a new servo motor an it still will not rotate to the HI position it will only go about 3/4 of the way. Could it be the PGM ??.Any help would be greatly appreciated.
Cheers.

Unplug the servo motor and make sure you can turn it using your hands first.

Check that the valves inside the barrel are going to their full open postion rather than whats writen on the servo body.
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If I have to take the carbs off once more...

Thanks very much for the reply stephen.
the servo motor turns fine when unplugged.??
Will rip the pipes off an investigate further tomorrow.
Cheers

Dumb question but have you checked whether the cable adjusters are slackened off too?
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Just for your information, "Hi" isn't actually the high mark! It's only an indication so you know the valves are moving towards the high position.

As Dave says, make sure the cables are adjusted properly, and also have the required slack in them.

If in doubt as to its operation, I would be inclined to fit the servo without the cables attached (pin the RC Valves open with a knock pin) and run the motor. The servo should move from closed to open at 2000rpm and back to closed at 3000rpm. Once you've ascertained correct movement, then attach the cables and adjust the cables as necessary.
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Andy.
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Thanks guys. After checking the powervalves as described they appear to be working just fine. I think my problem lies in the TPS as it feels like it did when I did'nt have the TPS fully plugged in at one stage. I think it's the TPS coonector block as it's quite warn from having the carb's off so many times.
Does this sound feasibe??
Thanks again for you Help/Knowledge.

is it a straight forward procedure replacing the TPS as i have a spare ??
THanks

I haven't replaced a TPS before but my servo motor does all kind of funny things with the TPS plug unplugged!

I normally set the powervalves with the pipes off so I can make sure they're bang on the money in the "high" position!

montsta56 wrote:
is it a straight forward procedure replacing the TPS as i have a spare ??
THanks

It's straightforward if you have the Torx bit to undo the retaining plate screw and a multimeter to check the setting once the replacement TPS is fitted.

Fine adjustment of the TPS can be the difference between 30hp and 60hp!
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Andy.
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lol, do you remember that on the dyno?

First run it only made 25hp @ 8000 rpm, adjusted the TPS and it made 66hp @ 11500!

That first run I though I was working on an MC28!
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If I have to take the carbs off once more...

StephenRC45 wrote:
That first run I thought I was working on an MC28!

But a stylish one though!
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Andy.
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StephenRC45 wrote:That first run I though I was working on an MC28!

Or something I'd worked on...
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

You're doing much now Dave!

It was great to get yours running at the last dyno day. How much did it make first run?
_________________
If I have to take the carbs off once more...

Over 8hp!
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball