Exhaust valve advice Please

[technotony007]

Gents & Madames,
when i switched my ignition on recently, I have a query regarding the "flappy " , exhaust valve. The stepper motor on mine was making a clicking noise , and did not seem to move much. I stripped the unit off the exhaust , cleaned it up. Then washed out with WD40. I then switched the bike on a few times , and the cables seemed to move forward and back freely enough.But when i refitted the Valve , it only moved slightly ,

I would be most grateful if anyone out there can a advise :

1. when the ignition is switched on and off , Should the flap be moved by the stepper motor one complete cycle of open and close.

2. Does the flappy valve close under the pressure of the spring fitted to the mechanism ? when opened by hand.

3. i can open mine by hand , and i had to close it by hand , as it moves freely but stiff seems stiff in operation . Should it be more freely , easy to move ?

4. Anymore recomend some lubricants like graphite grease to to maintain the unit.

I will attached some pictures below to show the condition of part, when i suss out how to do it...

regards and thanks in advance

Tony

 

[patzx12]

I did look at mine when i had the tail pipe off, it shouldnt close fully only partially.
I dont think there is a problem with yours, does it open fully when you rev the bike?
My valve has been faultless, as for lubrication i thinkl it gets too hot for lubrication, just give it a good clean.
Someone will be along soon with a more technical response.

 

[Kenny Rodkiss]

See post 7, my one moves quite freely and is held open by the spring.
With the cables disconnected and push closed it snaps briskly back open.

http://www.ukgser.com/forums/showthread.php?t=239527

 

[rocky burns]

Is there a need for it or can it be removed???????

 

[technotony007]

The flap didnt move much, when i opened the throttle. Spoke to few people who all said the spring should keep it open. I took the to the local dealer( cooper BMW sunderland ) and showed them the part ,and asked the same question. luckily it was covered under warranty , and i have dropped the bike off and hopefully i will get it back later this week.

Thanks to you both for your input ,

much appreciated

regards

Tony