Jiffy 2HP Tecumseh High idle RPM

[redtrucks]

Does anyone know the spec of the what the high idle rpm should be on the output shaft on a 2 HP Jiffy?

[hamms-scooter]

Not exactly sure but there is a point where the idle if to high will spin the auger when you lift it off the ice. You can set it off of that?? Go by ear... what you have left for throttle top end. Good question..

[redtrucks]

I guess I should have worded my question different. I would like like to set the high idle by adjusting the govener so this adjustment would not effect the low speed idle. I have adjusted the high idle by sound but I see in the Tecumseh manual that the govener should be set at XXXX rpm but the manual does not give that rpm spec. I was going to use a phototach to measure the output RPM. I'm trying not to overspeed the engine.

[Surface Tension]

The air flow coming off the flywheel, spring, and vane is your governor. Those springs are of certain size as well are the vanes, this will keep the RPMs at a safe level for the engine and gear case.

Now set the high speed mixture to its optimal setting by tuning by ear with a load on the engine. To lean and the engine will stop running abruptly with load. To rich and you'll here it bog.

You should adjust the high speed screw in(lean) till you hit max RPMs then back out the till the RPMs just begins to drop.

Idle mixture is much the same. I tend to stay on the rich side there so you won't have cold starting issues. While adjusting the low speed mixture you will end up have to adjust the idle speed stop screw.

[redtrucks]

I only have the low idle mixture screw on this carb and that is adjusted properly. My problem is that it doesn't seem to have enough WOT RPM and it looks like the only way that I can adjust that is by backing out the govener adjusting screw. Correct??

[folke2000]

Which is the high mixture screw? and which is the govnernor adjusting screw?

[Surface Tension]

There are a few different carbs and governors for the tec engines. If you have the governor with the plunger then yes that is how you set the WOT RPMs. How to set them. When you hold the throttle wide open, your butterfly is not automatically wide open. All that means is it could be wide open depending on the load. Your governor will will open and close the butterfly.

Back to the different type carbs. Some will have the high and low mixture screws will have the low mixture and fixed high speed jet. I believe SM site now has a pdf which now includes, carbs.

[redtrucks]

So is there a RPM spec that I can measure at the output shaft of the gear box to make sure that I'm not over speeding the engine?

[Surface Tension]

If your worried about too many RPMs then leave the governor alone. It is already set so there is no need to mess with it.

Very seldom if ever is there a need to adjust the governor. The plunger type is the most adjustable but that doesn't mean it should be messed with. Other governor adjustments include bending tangs or moving spring points so as you can see its isn't a fine tuning type deal. Springs are the link between butterfly and throttle. It is that spring tension along with the vane that is your governor adjustment. It is not like you can go beyond a safe with the same spring or vane.

What your protecting more then the engine is the gear box, they just aren't made for high RPMS.

If your having performance problems then cleaning and a carb overhaul is needed.

[redtrucks]

I just trying to find out what are the RPM of the gear box output shaft to make sure that my auger is turning at the correct speed at high idle. It seems like there are not enough RPM at WOT. The carb is clean and adjusted properly.

[toomanyjigs]

try some non oxy 91 or 92 gas and amsoil 100/1 oil i did that with my stx pro and now it starts usually on first or second pull way better thn the jiffy oil improved throttle response and idle too

[Surface Tension]

You could try and increase that spring tension.

Is it racketing at all or slipping? That is a sign your not getting enough RPMs to lock the clutch up.