Secondary Butterfly valve not opening according to throttle

[Dafeimao85]

Hi All,

I manage to retest whole bike again

I guess I found the reason why my engine bog

What happen as per topic it's not opening

When I on the engine, the butterfly valve went to 100% open. When I start it close and maintain at close position. No matter how I Rev the engine it remain close. After I off the engine, the valve then open back to 100%

Primary TPS voltage is working correctly. Ecu is getting TPS data but somehow the stva is not responding to the TPS.

Anyone has any idea about this? I try to Google but found nothing.

 

[Dennis]

Make sure you are at an RPM and throttle opening that will open the STP enough for you to see. Reference STP map below.

 

[Dafeimao85]

Make sure you are at an RPM and throttle opening that will open the STP enough for you to see. Reference STP map below.

View attachment 1693941

Hi thanks for the help,

So rpm below 3k should still be at 10%.

So that means my stva is working?

May I ask what is the top row 8.1, 16, 30, 60......