R80 Carb settings

lewisjohn · Jul 10, 2018

I’m looking for base data for 32mm Bings on my R80.at the moment I’m on 135 main jets,2.68 pilot jets, needle on middle clip, mixture screw 1 1/4 turns out,
The bike starts fine ,ticks over, but bogs down easily and the plugs are full of soot,am I missing something ?
I’m using standard airbox and filter, it has a 2-1 y piece and a GS high level silencer which has no baffle.

chrisshrops · Jul 10, 2018

Drop the needle down a clip

Beemerboff · Jul 11, 2018

chrisshrops said:
Drop the needle down a clip

#1 on that.
You might want to check the airflow through the two passages which run parallel to the intake - if you spray carb cleaner down them one should exir freely round the needle jet, the other from on of the pin pricks further down.
Not certain how your slide needles are held, but on my R75/7 the "star washer" which holds the wire circlip had lost its tension and the needle was moving around a bit.
Intermittently, which made it hard to find!

mikeyboy · Jul 11, 2018

As mr Boff has said,
Have the carbs been properly stripped and cleaned?
The air bleed passages can get gummed up with residue from breather gases,remove the main jet and holder,the air bleed jet and the uppermost seat to clean properly.

lewisjohn · Jul 11, 2018

Thanks for the advice guys, I ultrasonically cleaned the carbs again ,double checked the jet sizes etc,still no change.
As a long shot,I checked the ignition timing, eureka moment,adjusted the bean can position and there it was. Nice tick over, crisp throttle, no smoke, job done.

R80 Carb settings

lewisjohn

Well-known member

chrisshrops

Registered user

Beemerboff

Registered user

mikeyboy

Well-known member

lewisjohn

Well-known member

Similar threads