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Author Topic: Jiffy/Tecumseh Carb adjustments  (Read 60398 times)

Offline topher7694

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Jiffy/Tecumseh Carb adjustments
« on: Dec 30, 2009, 10:32 AM »
I have a Jiffy with a 3 HP Tecumseh engine.  What/how to adjust the carb, as it is running a bit rich.  I run Amsoil sabre at 50:1 in it, versus the recommended 24:1 with dino oil.  Any and all help is appreciated !

Offline ice dawg

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #1 on: Dec 30, 2009, 10:37 AM »

ADJUSTING TECUMSEH 3 HP CARBURETOR
pop the red caps off.

Close both jets GENTLY

Open the Low speed 1/4 turn

Open High speed jet 1 1/4 turn

Start engine.

Adjust low speed until idling smoothly.

Open her up wide open.

Adjust High speed until engine transitions smoothly from idle to high speed without bogging.

Shut engine off. Let it cool.

Once engine is cold. Fire it up and let it idle for 30 secs. Open it up wide open again. Adjust if necassary.

The trick with the Jiffy's is to tune them during cold (ice fishing) weather.

Low speed screw,the one on the left.

High speed on the right.
______________________ ___ 
 
 
 
It seems to go from zero to hero all some have to do is lie.

Offline topher7694

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #2 on: Dec 30, 2009, 10:39 AM »
Awesome ! Thanks so much...its a used auger I bought this summer, and I hope to keep it in good running order  ;D

Offline ice dawg

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #3 on: Dec 30, 2009, 01:40 PM »
Let us know if ya get it running right.  :tipup:
It seems to go from zero to hero all some have to do is lie.

Offline topher7694

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #4 on: Dec 30, 2009, 02:57 PM »
it's tomorrow's " project" it runs ok now, just too much oil out the exhaust and wants to stall at idle..

Offline ice dawg

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #5 on: Dec 30, 2009, 08:33 PM »
I run Amsoil Saber at about 80:1 and I don't get any gunk out of the exhaust.
It seems to go from zero to hero all some have to do is lie.

Offline topher7694

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #6 on: Dec 30, 2009, 08:45 PM »
I know that the guy that I bought it from only ran about 1 gallon of the 24:1 through it, so I know that they say that there is a break in period, so eventually I will get up to the higher ratios...just don't want to kill it yet

FISHFORPIKE

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #7 on: Dec 30, 2009, 08:57 PM »
I have a Jiffy with a 3 HP Tecumseh engine.  What/how to adjust the carb, as it is running a bit rich.  I run Amsoil sabre at 50:1 in it, versus the recommended 24:1 with dino oil.  Any and all help is appreciated !
Got this straight from Jiffy a couple of years ago:
Techumseh Carb Adjustments

Offline topher7694

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #8 on: Dec 30, 2009, 09:00 PM »
Thanks. ! ;D Got it purring like a Lion !!!

Offline ADKFisher

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #9 on: Jan 03, 2014, 09:39 PM »
Thanks Ice Dawg. I was glad to come across this thread after my old Jiffy didn't run at high speeds when I fired it up this year. I did exactly as you recommended and ta da, my old Jiffy is running nicely. Well, at least in the garage and driveway. Will try it on the ice tomorrow.

Offline ice dawg

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #10 on: Jan 06, 2014, 11:45 AM »
Glad it worked for you.  ;D
It seems to go from zero to hero all some have to do is lie.

Offline Monticatgeek

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #11 on: Jan 07, 2014, 06:50 PM »
topher7694,

send me a PM with a email address for you and I will send you a PDF copy of the Tecumseh Carb manual that I have.
Fishing is not a hobby it is a way of life

Offline poorfisherman

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #12 on: Jan 08, 2014, 04:50 AM »
My white lighning has preformed the same from brand new. Always took a while to warm up when cold and seemed under powered.  I didn't think any different cause that's how it always was. After reading a few of these threads and making a few carb adjustments. WOW new machine.
Blake from Elbow

Offline JPage92

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #13 on: Nov 23, 2017, 01:53 PM »
So I just adjusted my old model 30 (the white and black model) the way listed on here and it made mine run crapty. So after tinkering with it for about an hour I figured out the the adjustment screws were opposite. (low speed on right, high speed on left) After changing this my auger came alive and was running better than ever before!

Offline ice dawg

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #14 on: Nov 23, 2017, 02:58 PM »
lol Glad ya got it working.
It seems to go from zero to hero all some have to do is lie.

Offline Houligan

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #15 on: Nov 25, 2017, 11:36 AM »
Before just turning any of the adjustment screws all the way in and ending up with a possible worse situation. Remember turning the idle screw in will lean and turning out will richen the mixture. The air mixture screw will do the opposite. Make adjustments in small increments and allow the motor to recover before any further adjustments. Its possible you may only need a small adjustment to fix the issue if this is actually the issue instead of starting over. Many times older needles are damaged when turning all the way in. It takes a delicate touch.

These adjustment screws don't really just turn on their own causing the mixture to be off, very rare. If you are seeing the need to adjust your carb it could the first sign there is an issue causing this. If fuel jets are being plugged it will be running lean. If the air jets are plugged it will run rich. If the float, float needle or any other passage is hanging or plugged it will cause the same.

Always ask why before making adjustments. I recently fixed a power head and all that was wrong is a kinked fuel supply line. 

Offline ChrisW

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #16 on: Dec 29, 2017, 12:37 PM »
Got this straight from Jiffy a couple of years ago:
Techumseh Carb Adjustments

Does anyone have the document FISHFORPIKE attached below? the link does not seem to work now

Offline OntarioRider

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #17 on: Dec 29, 2017, 12:44 PM »
No but I have this from when I bought my used Jiffy.
I think it is the same for 2hp, as I used these instructions for mine.

ADJUSTING TECUMSEH 3 HP CARBURETOR

pop the red caps off.
Close both jets GENTLY
Open the Low speed 1/4 turn (left)
Open High speed jet 1 1/4 turn (right)
Start engine.
Adjust low speed until idling smoothly.
Open her up wide open.
Adjust High speed until engine transitions smoothly from idle to high speed without bogging.
Shut engine off. Let it cool.
Once engine is cold. Fire it up and let it idle for 30 secs. Open it up wide open again. Adjust if necassary.
The trick with the Jiffy's is to tune them during cold (ice fishing) weather.
Low speed screw,the one on the left.
High speed on the right.

Offline Roccus

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #18 on: Dec 29, 2017, 01:31 PM »
These carbs are as simple as it gets...  there is a miss understanding about the two screws... the one closest to the power head ( left hand screw) is the low speed/idle mixture screw... the other is the MAIN mixture screw.... both should be backed out 1 turn from lightly seated to start ( I find 1 1/8 - 1 1/4 to be better for initial cold start) start the engine and let it warm up... then adjust the MAIN ( right hand) mixture screw in ( towards lean) until it starts to sputter/misfire) from a lean out condition_ ( do this slowly allowing the engine to adjust to each new setting) when the engine begins to misfire back the screw back out ( keep track of revolutions) until the engine smooth's out and then once again  begins to misfire from an overly rich condition... set adjustment in-between the 2 extremes... erring on the side of rich... repeat the exact same procedure  for the low speed  screw,... the main should always be adjusted first as this controls the volume of fuel available to the low speed circuit... do the adjustments slowly allowing the engine to adjust to each new setting...hurrying the process is the biggest mistake "back yard" mechanics make.... I've been working on 2 stroke small engines and outboards for 50 years...my specialty is fixing the ones every one else screws up.
"A mans got to know his limitations"

Offline ChrisW

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #19 on: Dec 29, 2017, 07:10 PM »
thanks for the help all. I think I got it up and running. cleaned the diaphragm and adjusted the screws. seems to work best with the main screw 1.5 turns out and the idle screw 1 turn out. It does not idle well on its own but it will drill.

takin it out to NNY lakes tomorrow. Hope to gets some eyes or crappie.

FISHFORPIKE

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #20 on: Dec 29, 2017, 07:14 PM »
Last I knew (most recently, last year) Chaumont Hardware still has rebuild kits for those carbs.

Offline ChrisW

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #21 on: Dec 29, 2017, 07:16 PM »
Last I knew (most recently, last year) Chaumont Hardware still has rebuild kits for those carbs.

Great to know. Thanks much for the help. I didnt even see that you were from NY. I fish black lake from time to time. I am thinking of trying Hyde out tomorrow.

FISHFORPIKE

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #22 on: Dec 29, 2017, 07:19 PM »
Good luck tomorrow - Let me know how Hyde is, please. 

Offline ChrisW

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #23 on: Dec 29, 2017, 09:18 PM »
Good luck tomorrow - Let me know how Hyde is, please.

Will do pike.

Offline ChrisW

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #24 on: Dec 30, 2017, 05:45 PM »
Good luck tomorrow - Let me know how Hyde is, please.

Fished Hyde for several hours today. Lots of small perch but nothing really worth trowing in the bucket. ice was fine at about 7" but the snow and slush was a bear. lots of slush and water on top the ice in spots. snow was about 4-6 inches. there were about two or 3 groups out there. not sure if they were catching.

looking for some walleye there on Hyde but no luck after two trips. Has anyone had luck at Hyde for anything other than dink perch?

Offline ice dawg

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #25 on: Jan 20, 2018, 03:31 PM »
Bump
It seems to go from zero to hero all some have to do is lie.

Offline Blackie 207

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #26 on: Feb 10, 2018, 02:44 PM »
Just got my jiffy back from shop. It is supposed to be running great. It idles fine but when I try to drill a hole it has no power and bogs out and dies takes me 5 minutes to get through 14 inches of ice.. any help would be greatly appreciated

Offline NY_labman

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Re: Jiffy/Tecumseh Carb adjustments
« Reply #27 on: Feb 10, 2018, 02:51 PM »
Sounds like a bad spark plug if it’s a problem under load. That’s the first place to look.

 



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