Idle problems 1150gs twinspark

[Dirtcopper]

Where's all the experts?

So today I used my new feeler gauges( thx again Welsh) to do the valves on my twinspark 1150gs, it was a success!!

Then I checked the timing and that was also set spot-on.

The last thing I did was to set the TPS, 0.360 volt on my fluke multimeter.(Is this value correct?) I also took out the number 5 fuse to reset the motronic system. Twist the throttle 3 times as instructed.

Everything was done by the book.

My main problem is that I cannot get the bike to idle on 1150rpm. I took out the BBS and cleaned them, I also checked the throttle cable play on both throttle body's. The throttle cams also return to the correct position against the stop screws.

With both the BBS turned out 1½ turns the bike was started and idled at about 1750rpm. With the manometer connected the BBS was turned in to adjust the idling to the correct rpm. At the end the right BBS was turned in all the way and the left one about a quarter away from being turned in all the way. I couldn’t get it below 1500rpm. I also checked for air leaks but none was found.

Is there something I'm not doing right or what? Please help!!!!!!

 

[ChrisH Kerry]

Are you sure there is free play in both cables at TBs ie. that one cable isn't holding open throttle slightly on idle? Or fast idle lever stuck? Sounds like throttle is being held open somehow even without any twist on grip....

 

[Dirtcopper]

Are you sure there is free play in both cables at TBs ie. that one cable isn't holding open throttle slightly on idle? Or fast idle lever stuck? Sounds like throttle is being held open somehow even without any twist on grip....

Thanks for the reply and yes I'm sure. Can the TPS have a influence on the idling settings?

 

[Welshman]

Thanks for the reply and yes I'm sure. Can the TPS have a influence on the idling settings?

Only if its stuck and holding the throttle body open, see I also don't know here DC

 

[MikeP]

Check the seal of the tubes (mixture into cylinder). Too tight can be as bad as too loose I believe.

 

[fatnfast]

Did the bike idle correctly before you 'tuned' it?

 

[oblertone]

Check the basics first ...

... i.e. is the throttle cable over the RH pot seated correctly ?

 

[Den]

Rubber doodahs on the vac take-offs. Checked?

 

[Welshman]

Rubber doodahs on the vac take-offs. Checked?

He did a sync and the issue was there before

 

[Dirtcopper]

Only if its stuck and holding the throttle body open, see I also don't know here DC

Aha, you are everywhere Whelsh

 

[Dirtcopper]

Check the seal of the tubes (mixture into cylinder). Too tight can be as bad as too loose I believe.

Will check thx

 

[Den]

He did a sync and the issue was there before

I did mine, then found out that they were perished at the bottom, but looked ok at first glance.

 

[Steptoe]

Did the bike idle correctly before you 'tuned' it?

This is the important question that needs answering before offering any suggestions.

Plus i'd like to know how the OP checked the timing ?

 

[Dirtcopper]

This is the important question that needs answering before offering any suggestions.

Plus i'd like to know how the OP checked the timing ?

This is how i checked the timing:
http://advwisdom.hogranch.com/Wisdom/Oilhead Timing The Easy Way.html

This is the second time I did it (tune-up). It idled fine before i did it the first time.

So I must have done something wrong the first time already

 

[Canuck]

This is the important question that needs answering before offering any suggestions.

Plus i'd like to know how the OP checked the timing ?

WHy is it that you always know whats wrong?