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tntatro

Problems throttling up when cold

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tntatro

Hello, my c160 seems to have problems throttling up when cold. It will start okay but when I throttle it, it will stall if I don't turn the throttle back down. After its warmed up it will throttle up okay. It will also backfire if I throttle down too quickly from full throttle.


I cleaned the carburetor and adjusted the valve to tappet clearance. The exhaust side was set okay but the intake side was much wider than it was supposed to be. The adjustments didn't seem to change anything. I also cleaned the cylinder head and put in a new gasket. The bore looks really good, no scoring.


I noticed there are air bubbles in the fuel line after the fuel pump (line pictured). Also, after I shut it off air will enter the line right before the fuel pump. Is the fuel pump something I can clean and rebuild? I didn't want to mess with it because I don't have parts if I tear a gasket.

Are these problems that need to be fixed before using the tractor? I just got it last fall and have not yet used it other than testing it out a little. The grass is starting to grow now so I'd like to get it going good. It seems to run and function fine when warmed up.

20180413_183316[1].jpg

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WHX??

Doesn't sound like you have too big a problem, most of my tractors if not all need a little choke whe throttling up cold, worse when near or below freezing temps. When throttling up I just give her a little quick choke. When warmed up all is good. Try tweaking the carb mixtures a litte but this should be done with a hot engine. Sometimes you can find a happy medium. As far as the backfiring when throttling down again many of mine do that...perhaps carb adjust  a bit on the rich side but if never bothers me. Can also be due to a tad off ignition timing but again not worth the tweakin.. Try throtting up and down slowly. 

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tntatro

Okay, thanks. I guess it just needs to warm up. It was much worse when it was colder out.

I just cut the line before the fuel pump and refit it and the air bubbles seem to have gone away. I won't know if that did anything for the throttling up until it cools down again.

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WHX??

I woudn't worry too much about the air bubbles either, they will vent out through the bowl vent. Might just mean you have a small leak in the fuel line or pump. Most of us run rubber lines so we don't even know it. As long as they don't starve the bowl of fuel.

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tntatro

Okay, thanks again. 

 

Tim

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WHX??

Your :text-welcomewave:

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