Export thread

well I picked her up back at the start of February and have been slowly working on it. had to wait on a solenoid and when they came the starter nut stripped so had to wait on that :thumbdown:

Model # 197-257030

Im at the point of trying to get the carb tuned in then to fix up the plow mount(tighten it all up and weld some washers in to fix some slop)

I got the idle somewhat set on this OH140 engine (Tecumseh 14 hp) but I cant get a smooth idle and there's a valve tap

Also when I try to speed it up it does nothing at all.

So my question is how to I get this trouble some carb tuned in?

how do I tune this carb??? It was idling went to run it today and it just wont idle... when I did get it running I put it I gear to move and it bogs the engine to a stall. im soon ready to scrap this thing....HOW DO I GO ABOUT TUNING THIS TO AT LEAST RUN?

Sorry I don't have much time right now to help you, but until I can get back this evening, maybe these service manuals can get you started in the right direction.

http://www.mymowerparts.com/pdf/Tec...-TROUBLESHOOTING-AND-IDENTIFICATION-GUIDE.pdf

http://www.mymowerparts.com/pdf/Tec...-OVRM120-OVXLC120-OVXL120-OVXL125-695244A.pdf

I would start by checking all the governor links and springs are fitted and working.

all that seems to function as it should, when I did have it running and and I had throttle maxed out it wouldt rev and th little bit it did I would just surge.

Please read the manuals that Rivets posted, if you are sure about the links from gov to carb are working, you may need to clean out the carb again.

read them over with no luck, the WHG carb that was listen in the pdf's was different then mine. I have 3 screws on 1 side, 1 for throttle stop another closer to the engine and 1 that points down into the bowl(will get pics) going to try another good cleanout and see what happens.

Post up some photos of the carb, that way we can help you find the one you have. or look for numbers that should be on it, and post them up.

You can also read this manual which may also help you out.

https://www.dropbox.com/s/ggxsq5h34...-TROUBLESHOOTING-AND-IDENTIFICATION-GUIDE.pdf

Home

See if you can locate your carburetor numbers and go to this site.http://wem.walbro.com/walbro/product2.asp?Series=WHG&partnum=WHG-17-1

http://www.amazon.com/dp/B006VXFCK8...vptwo=&hvqmt=b&hvdev=c&ref=pd_sl_9nlmr1qxy1_b




http://www.stripmine.org/sears/engine/tecumsehtech.pdf








http://www.lawnmowerpros.com/Tecumseh/Tecumseh-Carburetors.asp

All the Walbro WHG carbs I see have a different bowl nut then I have on this 1(way I got it)
#'s I got from carb

1A70-1270
17B2602

Page 10 in the manual I posted.

the main issue with these guides is that it doesn't list what each screw is on my carb.

Go to the Walbro website, type in WGH-17 and it will list the parts breakdown. From that you will be able to figure out the purpose of each screw.

ok, got the screws figured out, guess its time to go heat up the garage,give it all a good cleaning and see what happens.

frantz65 said:

the main issue with these guides is that it doesn't list what each screw is on my carb.

Click to expand...

I take it you did not read page 19...!

EngineMan said:

I take it you did not read page 19...!

Click to expand...

my carb has a standard bolt at base of carb. nothing with a needle through it.

When you get back to it, put in a new plug and adjust the valves...

valves I do need to look into, can hear a tick. just gotta find the clearences and how to get in there. been busy listing vintage bottles on ebay(at least trying to :laughing

Fish said:

Tecumseh Engine Intake and Exhaust Valve Clearances

Click to expand...

thanks for that link! assuming its like any other motor ive done? find TDC and set from there?

well I had it idling great was even able to drive it a bit! then all of a sudden just died starts up and dies again. no idea why its doing this. ive gotten in tractors that had the carb gummed up that bad I didn't think it would ever run again that tuned in minutes. Max rpm is also barely above idle.(arm moves when tractor isn't running) ready to take it to the shop and pay to have it done... cant figure it out

A FREE Source for Roper / Sears Tractor & Attachment Manuals Don't give up, check this out page 26, repair kit part # 632033 item 33 on list.


Scroll down left side of page under sears tractors to 917-257030, 1978 GT/14 VARI-DRIVE.

http://www.searspartsdirect.com/par...odel-OH140160009B/1068/1503500/00029752/00002


Bottom of page new carburetor $168.78, not bad at all for 1978 Sears GT/14.

You just may have beads of water rolling around in your tank, filter, and carb.....

im going to drain the tank and flush it good tomorrow. as for the not revving issue im not sure. long as it runs good I think I can get it sold( I hope)

my dad bought one of those brand new in 1978,had a snowblower,1bottom plow,1 row cultivator,a disc,and a planter all 3pt hitch,your pic brought back lots of memories,when he plowed I had to sit on the hood for weight.lol thankyou

OK! The screw ,just above the float,is the idle mixture adjustment. Turn it IN,until it LIGHTLY seats,then OUT 1&1/4 turns.
The screw nearest the air cleaner,is the high - speed mixture screw. Turn it in to lightly seat,then OUT,1&3/4 turn.
Start the engine,and warm it up,& set it to idle position, then,SLOWLY turn the idle mixture screw in,until it stumbles,and note this position.
Back it out,until it smooths out,then out more until it stumbles. Turn it IN,again until it smooths out,+1/2 turn.
Next, set the throttle at full,and slowly turn the high speed screw in,until it changes rpm.
Back it out,until it just smooths out,then out some more,until it changes speed.
Turn it in,until max rpm is reached,then put the throttle on idle,and QUICKLY run it to full.
Any stumbling/black smoke turn it in 1/4 turn,until it is right.

Special note: These carbs are very touchy,and can be messed up with even the slightest dirt,water in fuel,etc.