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Old 08-21-2006 | 12:53 PM
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opjose
 
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From: Poolesville, MD
Default RE: Difficulty Tuning an Evolution Engine

Several things to try:

Leave the glow plug igniter in and throttle up and down again.

- Does the engine die the same way with the glow plug igniter in?

If so, move on...

If not, it MAY be too rich or there is a problem with the plug.

- Since it died with the plug in, follow WCB's advice.... but note the following.

On the Evolution engines the clip that holds the needles is usually too loose, both the high and low speed settings will "walk" as you move the throttle.

I had similiar problems to what you are having and it turned out that the "walking" was throwing the engine off enough to shut it down.

I removed the high speed needle and clip and rebent the clip to make it tighter... then reinstalled everything.

After the engine was adjusted I also installed a piece of cut off exhaust tubing to hold the clip tightly against the needle detents.

I also needed to richen the engine about 1/4 turn past the low idle stop. I undid the retaining screws on the collar and adjusted as needed.

- If all of this still fails, check the fuel / line flow.

Remove all of the fuel lines and tank, and blow through the fittings, etc. Are you getting any resistance?

Also note how the length of the lines adversely affects the amount of pressure that is required by a large degree...

When possible shorten the lines.