R1150 Throttle Butterfly Angle using GS-911

Discussion about modern BMW twins
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Sterob2
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Joined: Wed Jul 26, 2017 8:45 am

R1150 Throttle Butterfly Angle using GS-911

Post by Sterob2 » Wed Jul 26, 2017 8:58 am

Hi Guys,
I'm trying to find a hard starting problem I have with my 02 R1150RS and I want to find out what the factory spec is for the angles of the TB butterflies at all 3 positions of the High Idle lever.
I suspect mine are low...... My TPS or idle stops have NOT been interfered with.
Word is that the cable stretch and go out of adjustment. The bike is 15 years old after all..lol

Using a GS-911, I get :
Off=0.64°
Mid way= 1.59°
Max ( hold on ) = 3.19°

I have seen one mention that the mid position should be 4°.
( from 'Roger04RT' on the MOA forum, from a few years ago.... )
He then says he got best results with 3~3.5° at mid position.
This sort of info does not seem to appear in the specs anywhere I have seen.
I'd like to have a definitive figure to work towards instead of guessing or trial and error....

Can anyone help me or point me in the right direction?

Steve

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jagarra
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Location: Reno, Nevada

Re: R1150 Throttle Butterfly Angle using GS-911

Post by jagarra » Wed Jul 26, 2017 4:05 pm

Most of the activity on this site is geared toward airheads, even though some of us have newer Oilheads and such. I am attaching a link to a site that has free manuals to download, I have found these very good for providing information for working on my oilhead.


https://www.carlsalter.com/motorcycle-manuals.asp
1974 R90/6 built 9/73
1994 BMW R1100RS
1964 T100SR Triumph
1986 Kawasaki Concours

Sterob2
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Joined: Wed Jul 26, 2017 8:45 am

Re: R1150 Throttle Butterfly Angle using GS-911

Post by Sterob2 » Thu Jul 27, 2017 6:46 am

Thanks Jagarra. I suspect I will need 'inside knowledge' or trial and error, but have to try.
I'm familiar with the board. I have a few airheads as well...:0)
I'll check out the link and see what I can find.
Steve

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jagarra
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Joined: Mon Dec 26, 2011 12:42 pm
Location: Reno, Nevada

Re: R1150 Throttle Butterfly Angle using GS-911

Post by jagarra » Thu Jul 27, 2017 7:40 am

I have everything covered on boards, this one for my airhead, MOA for my oilhead and Advrider for other vintage bikes.
1974 R90/6 built 9/73
1994 BMW R1100RS
1964 T100SR Triumph
1986 Kawasaki Concours

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The Veg
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Re: R1150 Throttle Butterfly Angle using GS-911

Post by The Veg » Sun Aug 13, 2017 9:24 am

Thanks for posting here. We do afterall have this oilheads section, not that it can really compete with other sites.
Cogito Ergo Moto
----------------
"A bunch of weirdos with old motorcycles can never be boring." -Doug West
"It just wouldn't be a complete day if I didn't forget something!" -Me

Sterob2
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Joined: Wed Jul 26, 2017 8:45 am

Re: R1150 Throttle Butterfly Angle using GS-911

Post by Sterob2 » Thu Sep 07, 2017 7:18 am

I do what I can......
I got it sorted. I got some info that stated the butterflies should open approx 3° when the High Idle is operated.
I did this and now starting is good.

Steve

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