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carb. adj. tsx33

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norman j. (il.)

09-23-2006 19:02:39

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i rebuilt a marvel shebler tsx33 carb. can't get any adjustment at all, from the idle mixture screw. it does'nt matter if i turn it all the way in, or out. the main adjustment needle works fine.need help, thanks, norm.

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Hobo,NC

09-24-2006 12:21:30

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Re: carb. adj. tsx33 in reply to norman j. (il.), 09-23-2006 19:02:39

Tips, link

Carb Tips

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JDrew

09-24-2006 10:17:21

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Re: carb. adj. tsx33 in reply to norman j. (il.), 09-23-2006 19:02:39

Did a rebuild/soak-n-clean on my TSX33 and the new idle valve has to be set just a hair short of fully closed to get the idle right. As Dell puts it, there's a two-step dance for getting the idle speed adjusted.

FIRST: Get the engine warm. Discovered that this makes a HUGE Difference!

Set the quadrant on full idle and adjust the idle screw till it runs smooth. Then, adjust the throttle stop screw (on the back of the carb) to the slowest idle (or 400 RPM on your proofmeter). I usually burn my fingers on the manifold during this step. Next, re-adjust the idle screw, next the stop screw, next the idle screw, next the stop screw, last, the idle screw. It took me about eight cycles to get it "right".

my $.02

J-

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Popsater

09-23-2006 20:22:50

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Re: carb. adj. tsx33 in reply to norman j. (il.), 09-23-2006 19:02:39

Just to repeat what has already been said... Are you idling really slowly. You won't see adjustment make a difference until your idle is REALLY slow. Engine just ticking over.

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RustyAL

09-23-2006 20:00:17

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Re: carb. adj. tsx33 in reply to norman j. (il.), 09-23-2006 19:02:39

Check out the 2 passages in the throat line up with the center of the carb. And the passage mentioned in the other post. They are very small and you need to run a wire in them to be sure they are clear.

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Stumpalump

09-23-2006 19:57:41

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Re: carb. adj. tsx33 in reply to norman j. (il.), 09-23-2006 19:02:39

The idle screw all most all the way in is nomal with todays gas. Heardit from an expert.

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Bob

09-23-2006 19:07:42

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Re: carb. adj. tsx33 in reply to norman j. (il.), 09-23-2006 19:02:39

The idle screw has the most effect at SLOW idle.

It works backwards... all the way IN is full-rich, as it then is fully blocking a port that admits air to the idle mixture.

It sounds as is your carb may have a passage, down low in the float bowl, restricted.

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