Unofficial Royal Enfield Community Forum

Royal Enfield Motorcycles => Bullet Iron Barrel => Topic started by: donkey on November 14, 2007, 10:24:08 pm

Title: unestable idling speed and slowly throttle off
Post by: donkey on November 14, 2007, 10:24:08 pm
Thats the problem. First I suposse it was maybe by a bad low idling tuning, but riching or leaning the problem remains, 'cause rich or lean the throttle go off so slowly when I turn it, same from low speeds that high speeds, the throttle it's seems stuck.
Title: Re: unestable idling speed and slowly throttle off
Post by: Leonard on November 14, 2007, 10:36:46 pm
Will the engine eventually return to a normal idle when you shut the throttle?

Thats the problem. First I suposse it was maybe by a bad low idling tuning, but riching or leaning the problem remains, 'cause rich or lean the throttle go off so slowly when I turn it, same from low speeds that high speeds, the throttle it's seems stuck.
Title: Re: unestable idling speed and slowly throttle off
Post by: krodaddy on November 15, 2007, 12:22:23 am
Look for an air leak around the intake, the rubber manifolds are prone to splitting. I've been thru 2 of em.
Title: Re: unestable idling speed and slowly throttle off
Post by: Foggy_Auggie on November 15, 2007, 04:29:15 am
Loosen the clamps on the carb rubber boots after removing the air cleaner assembly.

Gently turn the the carb where the throttle cable entering the slide cap is facing more toward you.

Unscrew the carb slide cap and gently pull the slide out.

Check for hardened cosmoline grease on the slide - clean it off with kerosene.

Have a buddy pull on the slide and holding the cap, while you work the throttle, and check for any cable binding in the full range of mechanical travel.

If binding or roughness occurs, take off the cable at the slide cap and check for casting flash right in that area.  Will need a tiny model makers file to remove any casting imperfections.  Chances are this is where the binding will occur.

The exact same problem I had on my bike.  After fiddling with it for a long time - my dealer found the casting flash which slipped by me...

Regards, Foggy
Title: Re: unestable idling speed and slowly throttle off
Post by: dewjantim on November 15, 2007, 05:35:09 pm
Yep, sounds like an air leak......Dew.
Title: Re: unestable idling speed and slowly throttle off
Post by: Vince on November 15, 2007, 05:46:11 pm
         Another common problem is the tank may be pinching the cable. Make sure the cable is free under the tank. Sometimes I have to loosen the carb and tilt it slightly to the left to keep the cable from rubbing or binding on the inner edge of the tank. And, as has been mentioned, check the intake hose. you should also check the manifold mount at the cylinder head.
Title: Re: unestable idling speed and slowly throttle off
Post by: Spitting Bull on November 15, 2007, 06:36:06 pm
With the engine off, open the throttle with the twist-grip and then release it.  See if you can hear the throttle slide falling back with a little "clunk".  If you can't hear this, the throttle slide or cable may be sticking.  If you can hear it, then the problem is not the throttle slide or cable and may be an air-leak.

Tom
Title: Re: unestable idling speed and slowly throttle off
Post by: donkey on November 17, 2007, 09:38:25 am
Check. The throttle cable was sticking between the spine of the frame and the tank. Totally clipped at 3 or 4 cm to the carb-trottle calbe rubber cap.
Now the throttle is free and (after tune the carb) the bike is so smoooth and it's response normally at gas.
Thanks to all