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Idle Mixture (Read 3416 times)
Henrik Skak-Iversen(Guest)
Ex Member



Idle Mixture
07.10.01 at 08:03:00
 
Hi,

I have difficulty adjusting the idle mixture for my 1981 TR1.

I have checked the balance with a Carbtune manometer and it
now reads apr. 24 cm HG for both cylinders in idle at 1000 rpm.

Compression is 90 /95 PSI so no big difference between the 2
cylinders.

However the idle mixture does not work for the rear
cylinder/carburator. It runs best with the mixture screw turned
all the way in. The mixture is all too fat and the sparkplug gets
covered with carbon on the rear cylinder.
On top of that the exaust is banging due to the rear cylinder
(it stops banging when it only runs on the front cylinder).
I checked that the carb. piston (Drosselklappe) is all the way
down in idle.

Does anybody have some advice ?
(I can read German OK !)

Best regards

Henrik Skak-Iversen
Birkerød, Denmark

 
 
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Erik Steen(Guest)
Ex Member



Idle Mixture
Reply #1 - 16.10.01 at 12:46:00
 
Hi Henrik
Just a thought - - if the float is stuck og not at the right float hight, the fuel will run over and into the cylinder as long as the engine is running, with this run you cannot get anything right.
Hi from Erik

 
 
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Karl-Heinz(Guest)
Ex Member




Bike: BMW K 100 RS / TR 1 / RD 400 / BMW K1300S / KTM 690 SMC R
Idle Mixture
Reply #2 - 17.10.01 at 17:27:00
 
Hallo Henrik,
hast Du schon den vakuum-gesteuerten Benzinhan überprüft?
Möglicherweise ist die Membran gerissen und der Zylinder holt sich via Unterdruckleitung
den Sprit direkt aus dem Tank. Die Symptome sind so wie von Dir beschrieben und das ganze Din
läuft nicht richtig.
Gruß
karl-heinz

 
 

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MarkusDoell(Guest)
Ex Member



Idle Mixture
Reply #3 - 25.10.01 at 19:02:00
 
Hallo Henrik,
neben einigen Möglicjkeiten, die bereits genannt wurden hier eine weitere mögliche Fehlerquelle, warum der hintere Zylinder zu fett laufen könnte: undichtes Starterventil im betreffenden Vergaser! Ich habe monatelang gebraucht um schließlich sagen zu können, daran hat es bei mir gelegen.
Viele Grüße, Markus

 
 
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