The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: MikeFossl on December 25, 2021, 01:59:32 PM

Title: Carb overhaul, now running rich.
Post by: MikeFossl on December 25, 2021, 01:59:32 PM

I did a complete carb cleanup and replaced all gaskets, o-rings and bellows.  Stats fine but having trouble getting an even idle.  Checked plugs and shows even coat of carbon.  Replaced plugs with new and after a couple of minutes at idle and a 5 min ride, the new plugs show another even coat of carbon.

Tried to adjust idle mixture but did very little.  Currently at 1 turn out.

Any suggestions?

Thanks,

Mike

Title: Re: Carb overhaul, now running rich.
Post by: donbmw on December 25, 2021, 02:41:58 PM

Soak the carbs in cleaner again. Still have a passage stopped up.

Title: Re: Carb overhaul, now running rich.
Post by: dogshome on December 25, 2021, 05:07:13 PM

(1983)R65 idle screw start setting is 0.5 turns out. I have mine leaner than that with silent hektic ignition. 1 turn is far too rich. Check 1985 with your carb number here.

https://w6rec.com/wp-content/uploads/2017/07/Page2-2.jpg (https://w6rec.com/wp-content/uploads/2017/07/Page2-2.jpg)

Title: Re: Carb overhaul, now running rich.
Post by: wilcom on December 26, 2021, 12:30:57 AM

If you are not getting adjustment when you turn the idle jets you have a passage fouled. Blow carb cleaner thru them till they all squirt cleanly. The attached animation is a good picture of what you're after. 

https://www.youtube.com/watch?v=wyspAHrMbb8

Title: Re: Carb overhaul, now running rich.
Post by: MikeFossl on December 26, 2021, 11:21:16 AM

Quote from: dogshome on December 25, 2021, 05:07:13 PM

(1983)R65 idle screw start setting is 0.5 turns out. I have mine leaner than that with silent hektic ignition. 1 turn is far too rich. Check 1985 with your carb number here.

This is likely the issue.  I was following a general airhead carb rebuild video.  Thanks for that resource.  Once the snow melts I'll clean the plugs, start at 1/2 turn and try again.

Thanks!

Title: Re: Carb overhaul, now running rich.
Post by: MikeFossl on February 13, 2022, 03:34:02 PM

Finally a warm dry day….dialed back to 1/2 turn.   Running like a top.

Thanks!

Title: Re: Carb overhaul, now running rich.
Post by: dogshome on February 14, 2022, 04:39:54 AM

Thanks for the feedback, glad it is running well.