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Discussion Starter · #1 ·
I have a 400L that I rebuilt, was attempting to adjust the idle with the large throttle stop screw. It does absolutely nothing. Looking at the throttle valve (aka throttle slide) I noticed there was an indentation in it where it appears someone really cranked the adjustment screw up against it in the past. I removed it tried to remove the "indent" with a fine file, but it does nothing I was able to adjust the idle only by adjusting the cable that is connected to the top of the carb. I can see the screw come through the side of the carb into the venturi, but it does nothing Any thoughts?

DTLMG
 

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Not a really uncommon problem on the older machine. The slide gets a "detent" in it from the vibration and the slide gets loose in the bore. There is a hard anodized coating so if you file or machine the dent out, you have the bare base metal left. The slides were not available for the ones I worked on but i wonder if one of the cheap knock off carbs would be worth a try for it.
 

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Get a shorter spring for the idle screw or find a different idle screw - an idle screw from a Blaster/Banshee conversion kit might work
 
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