Re: Stationair problem

Posted by Joe (Wa) on January 11, 2004 at 09:30:33 from (65.126.49.75):

In Reply to: Stationair problem posted by Peter ten Hoor on January 09, 2004 at 01:25:56:

Peter, It appears you have afterfire in the exhaust as opposed to backfire back through the carb.

In troubleshooting check the timing and valve lash first. If both are correct go to fuel mixture.

Fuel wise backfire is too lean a mixture, afterfire is generally too rich I.E. the fuel is still burning or reignites when the exhaust valve opens. This can also be caused by a very lean mixture burning very slowly leaving unburned fuel to push out on the exhaust stroke and reignited in the hot exhaust manifold.

The reason the idle screw makes a difference is that you are varying the mixture (air or fuel depending of your carb) when the throttle plate is nearly closed with engine at idle or very low rpm. When the rpm is raised, the throttle plate opens the power jet and it controls nearly all the fuel delivery, the idle mixture adjustment now has little or no effect.

Set the idle mixture screw at idle rpm. Raise engine engine rpm to near full speed and try setting it. If that doesn't work you probably need a carb overhaul.

Joe

Follow Ups:

• Re: Re: Stationair problem Joe (Wa) 09:48:40 01/11/04 (0)

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