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Discussion Forum
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Leaning out a wd-45

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Craig

05-30-2003 11:10:36




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My wd-45 is running really rich it has a Marvel schebler tsx-464

how do I lean out the fuel mixture????




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Jack

05-30-2003 20:54:11




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 Re: Leaning out a wd-45 in reply to Craig, 05-30-2003 11:10:36  
Is your running rich problem at idle or at throttle? Or both. Didn't say if you knew the basics for adjusting the carb. Always adjust with the tractor at operating temp. When adjusting idle turn top screw in until tractor wants to stall-then turn back out Slowly until starts running rough again. Set somewhere in between where it sounds smooth.
High speed adjustment-open throttle fully turn bottom screw in until it starts bogging down. Now back out the screw until it smooths out and you should be OK. If under load you get a lot of black smoke turn in the highspeed screw another 1/8 or 1/4 turn. If it sounds a little weak running turn out the high speed screw another 1/8 or 1/4 turn. Other things that will give you rich or black smoke is float valve not shutting off totally or float set too high.

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Dave Grubb

05-30-2003 12:01:04




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 Re: Leaning out a wd-45 in reply to Craig, 05-30-2003 11:10:36  
The idle mixture screw is turned in for a richer mixture. The main load screw is turned in until engine speed drops and then turned back out until engine speed resumes.



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Ron

05-31-2003 23:22:59




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 Re: Re: Leaning out a wd-45 in reply to Dave Grubb, 05-30-2003 12:01:04  
You will find that if you are working it HARD, it will pull harder, by opening the needle another 1/4 turn.....!!!!



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Phill S. from MN

05-30-2003 11:20:57




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 Re: Leaning out a wd-45 in reply to Craig, 05-30-2003 11:10:36  
I had this problem with my 1954 WD-45, too. It has the same carb as yours. I kept trying to lean out the mixture screw on the bottom of the float bowl, but I couldn't ever get the mix right for both the top end and the idle end. Then I discovered that the choke rod and the lever that connect to the choke shaft had enough play in them that the choke plate was never opening up all the way! I was trying to adjust the carb with the choke about 1/3 on. Fixed this problem, readjusted the mixture screw and it's been running great since. Hope this might help you.

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