Small Problem...

[SNateYingling]

I just purchased a Yerf-Dog 1203a from Ebay.
The motor is a Tecumseh Power Sports 5HP

I ran it for the first time last week and gas was pouring from the air cleaner. Knowing a little about engines in general, I cleaned up the carb today. The carb seemed fine, everything moved freely and was not all that gunked up. Cranked her over today to find the same problem...gas pours from the air filter until it gets running good, then it stops coming out of the air filter and the kart runs great.

Problem I now have is this:
Back on the throttle linkage (don't know it's name for sure) there are 2 springs. One looks like someone bent a paperclip and stuck it in there. The other looks like any ol' spring from a lawn mower engine. My problem is that I took them off and not sure how to put them back on. When I crank the kart up, she runs instantly at wide open throttle. Anybody got any advice on how to fix this problem? Gurus out there, help please!

Thanks in advance for your help!!!

 

[Russ2251]

gas pours from the air filter until it gets running good, then it stops coming out of the air filter and the kart runs great.

Did you check for defective/faulty float/needle?

 

[SNateYingling]

Everything seemed normal, but I am no expert. I guess the bigger problem is the placement of the spring(s). Like I said, the one looks like a bent paperclip, so I removed it. Now I am not so sure I have any of the springs on right. The spring(s) in question go to the arm that opens/closes the butterfly valve in the carb. Should that be open or closed when the throttle is not pressed? It stands to reason that it should be closed, but like I said, I am no expert in the matter.

 

[Russ2251]

I am not all that familiar with the governors on OHV Tecumseh's. I'm sure someone else will chime in.
Tip:
Take pics for reference before disassembling anything.

 

[solomon]

My Tecumseh engine had the same thing, now i know that it wasn't a paper clip and was meat to be their. You just have to play with it to figure it. And as for the gas coming out of the intake, sounds like you float is stuck, either sinking or out of adjustment allowing excess gas

 

[SNateYingling]

Solomon,

Thanks for the tip, now I know!! I was thinking about it to but decided against it to avoid any gassy fingerprints on my iphone...LoL

If anyone has a pic of the Tecumseh 5hp motor rear (where all the springs are) could you please post it? It would help immensely!!

I guess what I need to know before playing with it any further is this...
is that butterfly valve in the carb supposed to be open or closed when the gas pedal is NOT depressed. Luckily I did not throw away what I thought was a paperclip. If I hd to make a guess, I would assume that is for the governor? Or am I way off the mark here?

Thanks again for your input!!

Nate

 

[Benjo]

the butterfly valve should be closed when the throttle is not pressed, it should open when you push the throttle.

 

[Blazkowiez]

Gas pouring out of the intake can mean several things, bad float, bad rings, bad seat, bad needle.

You should purchase a rebuild kit and install it, clean out both brass parts of the carb.

Once you have the carb off the kart, remove the float from inside the bowl, shake it to hear for liquid in the float, if it is not dry you do have a bad float.

It might be prudent to change both o-rings, the seat, and the 2 gaskets, both bowl and main jet.

Under your carb the linkage you mention will contain the governor spring, the other is a manual linkage adjustment piece which was not intended for snap back linkage and is rarely removed, it should make a sort of figure 8 pattern.

The shorter end of the governor spring should be placed in the first or second hole from the top for testing, the longer end with the long looping end will go in the side of the throttle linkage to the right, this will be on the control arm which pivots with the throttle cable's force.

I am not quite the best person at explaining all of this mind you, but it will help us if you give us pictures.

 

[SNateYingling]

Thank you, that's what made sense to me. Now, to figure out how to get the springs on so it stays shut. That should be fun because I haven't the foggiest on how to do this. I don't think the springs were on correct when I got it because the butterfly valve is always open...hence the gas pouring out of the air cleaner. I don't think it is the float or needle in the carb.

Tomorrow is another day to play with it.

 

[SNateYingling]

Gas pouring out of the intake can mean several things, bad float, bad rings, bad seat, bad needle.

You should purchase a rebuild kit and install it, clean out both brass parts of the carb.

Once you have the carb off the kart, remove the float from inside the bowl, shake it to hear for liquid in the float, if it is not dry you do have a bad float.

It might be prudent to change both o-rings, the seat, and the 2 gaskets, both bowl and main jet.

Under your carb the linkage you mention will contain the governor spring, the other is a manual linkage adjustment piece which was not intended for snap back linkage and is rarely removed, it should make a sort of figure 8 pattern.

The shorter end of the governor spring should be placed in the first or second hole from the top for testing, the longer end with the long looping end will go in the side of the throttle linkage to the right, this will be on the control arm which pivots with the throttle cable's force.

I am not quite the best person at explaining all of this mind you, but it will help us if you give us pictures.

Will try to post some pics tomorrow if I can't figure it out. I did not even think to check to see if the float was full. Thanks for all the input.

 

[Kaptain Krunch]

those tecs use rubber needle seats, which are easy lost when cleaning the carb with compressed air. Make sure yours is there, and not brittle/cracked.

 

[Blazkowiez]

The butterfly does not keep gas from exiting the air cleaner, it does not create some sort of magical air tight seal which prevents gas from leaving it. You have something clogged.

Mainly I would think that your butterfly was wide open given that the previous owner completely jumped the governor using this linkage bent in one way or another and that is what was holding your butterfly open.

 

[motor_head]

most small engine governors open the throttle all the way up when the motor's not running, it's because there is not force on the internal gov weights making the throttle want to close

 

[Blazkowiez]

You'll notice that Honda and Briggs do operate in this manner that but most Tecumseh engines do not. **horizontal go-kart ready linkage specific engines** Vertical engines by Tecumseh and some engines for use on Pressure washers and Generators operate in the manner to open the butterfly for easier starting.

When speaking specifically about these we have to keep this factor in mind, which is why they are harder to start and sometimes require us to move the butterfly manually to start the engines, it is really a pain but is needed them running when cold.

 

[NMshifter]

another way to check your float, is fill the bowl with fuel(running engine). the float should cut off fuel at 3/4 full. any more or less you need to adjust your float.

 

[skylartjsayers]

I dido the responses here. It was funny, I did a port job on my 2 stroke and it spit back fuel at low rpm. My port job included cleaning rough edges, widening the intake and exhaust port, raising the roof on the exhaust port, chapfering the piston crown at the exhaust port, champfering the piston skirt against the cylinder wall, lowering the intake port floor and romoving 3mm of the piston skirt at the intake port. I also made the inlet ports and crankcase port for my diaphram carb more pro - flow. It spits fuel because I increased the intake duration significantly. The fuel economy kills you (espeacialy when your nitromethane is $45 a gallon) but the power gains at high rpm are well worth it. I thought at first that maybe you had bought a ported engine but it would not be the same on a 4 stroke as it is with a 2 stroke. Unless someone here has ported a 4 stroke and had the same results?

 

[dave1701]

I doubt these pictures of my tecumseh will help much, but here they are.

 

[Blazkowiez]

Your governing system is actually different than most Tecumseh engines they designed for Go-Karts and you see on many of the manufacturers that did use Tecumsehs. You would mainly see this style of governing on Brister Concept Karts which may be where the engine came from, these companies had a habit of keeping large stocks of parts to mass produce the karts then had to sell off components when they stopped doing karting.

 

[dave1701]

Mine?

 

[Blazkowiez]

No... the other guy who posted directly above my statement regarding pictures posted of a governor on a Tecumseh engine...