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Re: Carb problems

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Author  [Modern View]

02-28-2014 08:54:17

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depending on the carb, I have worked on a to30 tractor and my experience is the small adjustment screw controls idle only and turn that screw in will make the fuel mixture more rich which that screw should not be turned out more than 7/8 of a turn. as for the large adjustment screw it will control power at higher rpm, and I'm to understand from the factory it was to be adjusted under a load which is near impossible. one other thing to check is to make sure carb and intake are sealed good to each other and the block a quick test is to spray both area with carb cleaner while engine is running and listen for rpm changes, if so you have a leak and that will change how the carb reacts to adjustments

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02-28-2014 09:49:43

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 Re: Carb problems in reply to Z-man, 02-28-2014 08:54:17  
ok Z-man, no leaks but i did do a little adjusting on the throttle linkage, actually the tractor runs great but still the idle screw does not have any effect at all.

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02-28-2014 10:08:43

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 Re: Carb problems in reply to ditchwitch, 02-28-2014 09:49:43  
what tractor are you working on?

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02-28-2014 10:07:22

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 Re: Carb problems in reply to ditchwitch, 02-28-2014 09:49:43  
it probably won't make a difference by leaps and bounds but adjusting the idle screw should make the engine run smoother at some point, the more gas you gas the engine the less the idle screw does. make sure the idle speed is around 400 rpm and the timing is set at 6 degrees btdc. the slow the engine is turning the more effect the idle screw will have when adjusted

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02-28-2014 09:21:38

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 Re: Carb problems in reply to Z-man, 02-28-2014 08:54:17  
Thanks Z-man, i give it a try and see what happen now here shortly. i have rebuilt this tractor here at work. just got it fired up last night. I will update shortly

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