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Garden Tractors Discussion Forum

Tecumseh Enduro OHV XL/C 17.5 HP

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Author  [Modern View]

07-03-2011 17:20:26

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Hi ,

I have a Tecumseh 17.5 OHV XL/C single cylinder engine that I posted about before . I took my old carb and two more off of motors exactly like mine and made one carb after trying all of them individually . I finally got it running , but the carb throttle butterfly and governer fluccate back and forth . I forget the correct term . It's like I'm revving the throttle up and down when I'm not . Any ideas as to what is causing this and how to stop it ? Thanks for any and all ideas .

The motor numbers are : Model - OHV180
Spec. - 208001A
Engine Family - 3TPXS. 4902AA
DOM - 02304CB0248
Disp. - 490 CC


Have a Happy and Safe July 4 .

P.S. See my post under Tractor tales on this site .

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Kentb of SWMO

07-04-2011 08:44:16

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 Re: Tecumseh Enduro OHV XL/C 17.5 HP in reply to Whizkidkyus, 07-03-2011 17:20:26  
Is this the carb with the plastic bowl and NEITHER idle or high speed mixture adjustment? If so I work on one of these about three years ago. The only way I could make it run was to drill out the Brass idle mixture jet and the PLASTIC high speed jet.


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joe csuti

07-03-2011 17:56:07

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 Re: Tecumseh Enduro OHV XL/C 17.5 HP in reply to Whizkidkyus, 07-03-2011 17:20:26  
The more than likely cause of your problem is dirt in main jet or idle passages in carb body(a common problem on tecumseh carbs)with dirty/plugged idle passages this will cause eng to surge/hunt for it's speed,as the govenor moves the throttle shaft/butterfly between hi & low speed jets to maintain eng set speed,if low speed/idle passages in carb dirty/plugged,when butterfly closes & eng tries to pull gas from idle jet & can't get same,eng slows down & govenor senses this & nudges/slams throttle to wide open position & eng gets gas off hi speed jet,then govenor slows eng down to match set speed & whole surging/hunting process starts over again OR the other possibility,govenor spring/linkages installed incorrectly or misadjusted.

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07-03-2011 22:35:12

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 Re: Tecumseh Enduro OHV XL/C 17.5 HP in reply to joe csuti, 07-03-2011 17:56:07  
Joe Csuti,

Thank you for the information however there was a couple of things that I forgot to mention that you reminded me of. One is that I cleaned the top metal part of the carb. ( the part that looks like a big heatsink ) as I said about the Briggs engine below this post I cleaned it with carb cleaner , poked it out with a small wire , blew it out with a air hose and soaked it over night in a gallon of Berrymans , ( I believe it was ) carb. cleaner . But , still that dosen't mean that it's clean and not stopped up somewhere . Another thing is the O ring / washer thing that the fuel solenoid presses up against in the bottom of the carb. bowl was closed up a little and I punctured the hole out a little bigger with a nail . I didn't soak the carb bowl as I thought that the carb cleaner might damage it , but there is some small holes that I couldn't get a wire into, muchless a lot of spray carb cleaner . I'll take it off tommorrow and try to soak the whole thing in carb cleaner. Is the stoppage in the hi / low jets in the carb bowl or the metal top ? I'm thing the bowl where the main jet is . Am I right ? How big should the hole in the fuel solenoid O ring be , the O ring that the fuel solenoid pressures the spring and stopper up against in the bottom / side of the bowl ?

Thanks ,

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joe csuti

07-04-2011 03:51:32

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 Re: Tecumseh Enduro OHV XL/C 17.5 HP in reply to Whizkidkyus, 07-03-2011 22:35:12  
I looked at carb at partstree,there are low speed/idle passages in carb bowl & carb body,these passages could be dirty/plugged in either/both,if you look at carb drawing at partstree for your eng,you'll see a welch plug(47)in top of carb body,under same are passages that form a T,this is a favorite spot for dirt/gum to collect & block one/more passages,you'll probably have to destroy plug to remove,with plug removed you'll be able to run a wire/shoot carb cleaner thru air bleed vent,passage to carb bowl & low speed jet passage,after that you can buy a new welch plug & replace,the O ring may be soft/mushy due age & ethanol content of gas & need replacement,in addition you may have a leaking gasket where carb bowl meets carb body,idle passage passes thru this gasket from bowl & same may be leaking & idle passage sucking air,you're probably ahead of the game buying a rebuild kit for carb as you will have new parts & all parts needed to repair,then take it from there if you still have problem.

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