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Discussion Starter · #1 · (Edited)
I ordered a carb for the tec OHH50 and received aone ofr a OHH55 didnt notice it until it was installed seems to run (ok) untill yuou add air cleaner then chokes out and hunts for (air) is there a fix or am I screwed and need a new carb ED Needed a 640014 or 68002A but one site said 640025c that what I got #@$%^&
 

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Discussion Starter · #3 ·
Yes have old one, I tried swapping bowl jets and it was worse! and the bowl moved so took forever to get it right to stop flooding, so put new one back in then wouldnt run unless primer was held in so changed out bowl gasket, now seems to be running ok had to re-adjust gov spring we will see tomarrow this has been a nightmare been working on and off for 3 months hope to break even have never had luck with tech carbs and NO more, tired of working for nothing dont know what Im doing wrong but not going to try any more ED
 

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It sounds like you swapped an externally vented carb for an internally vented carb. Look in the "throat of the carb" does the new one have holes in it and the old one didnt?
 

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Sadly another one of us has gone through the Tec carb knumbing process. That's when you finally get to a point and say. NO MORE TECUMSEH

Now the next lesson is to practice saying " I'm sorry you bought this at Sam's club and it didn't make it through one season. I wish there was something I could do for you".
 

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Yall would crap if you looked in my shed...Ive got a line of H50, H60, HH60 and an OHH50 tecumseh engines all lined up on my storage table, for the most part they all are stock and work fine...1 needs a carb though.

Ive got an HH60 that I put an 10hp HH100 carburetor on, no governor...revs NICE.
 

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I can't see how a 10% difference in engine power will affect the operation of the carburetor. A small carb. will work fine on a larger engine, it will just limit its power. A large carb. will not work on a smaller engine, as the engine doesn't have enough air flow to operate the carb.'s metering systems correctly. I would look for some other problem with your engine.

I recently salvaged a Honda HS 520 snowblower with a blown engine. I replaced the 160 CC engine with a 190 CC shortblock. It runs great on its original 160 CC carburetor.
 

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Discussion Starter · #9 ·
Up date well went out to start up and check hard to start and need to keep pressing the primer untill it catches about 20 or pumps then will run ok could there be a vavle issue along with the carb problems? R this carb is for a bigger motor ED
 

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The 5.0 and 5.5 Engines are nearly identical, small difference in displacement, the carb bores are probably nearly identical as well, with different jets...

I used to do alot of experimenting with carbs...

I ran a 13hp honda carb on an 11hp honda, 9hp honda, and 8hp honda with only a jet change, ran perfect. I adapted a 13hp honda carb to fit a 6.5 Honda, I had to modify the governor spring because the carb flowed alot of air at partial throttle and it wanted to rev past 5500, but after some adjustments, it ran great, ton of odd idle power and negligible hesitation.

Im running a 6.5 (OH195) tecumseh carb on my OHH50 tecumseh I just built, starts on 1 pull and idles great, tons of power, Ive got it mated to an 1800psi/3gpm pressure washer pump and it pulls it perfectly, only had to rejet it.

I put a 17hp Briggs rider carb, on a 10hp Generator, ran fine, actually solved a tip-in bog the engine had always had, ran the right speed, idled fine, I used the jet out of the stock 10hp carb, worked great.

On the tecumseh carbs in question, under the primer is a little rim, outside the little rim is an opening to the carb throat, and inside the rim is an opening to the fuel bowl. When you push in the primer (always push smoothly, and hold it for 1 second before releasing), the primer seals against the rim mid push, and forces air into the fuel bowl, which forces fuel up the main jet and Emulsion tube, into the carb throat. When you release the bulb, the seal is undone, and air draws in from the carb throat (or on vented bulbs, through the hole in the bulb), and the process starts over. There are no check valves, its crude but effective.

The system relies heavily on a well sealed fuel bowl, because if pressure cant build up in the bowl, it will not prime, at all..ever.

The bowl vent, is the port behind the primer..dual purpose.
 

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Discussion Starter · #12 ·
went and pulled the carb and checked it aginst old one the jets are the same no. 166 only differance is the emulsion tube seems to be a little higher in the venturi , went ahead and pulled bowl and replaced gaskets reassembled and installed started up and ran off and on rest of the day no leaks no flooding with air cleaner installed ??? went out a few mins ago to try starting but the oil is a little to stiff IE 25 deg. but hasnt lost any gas so maybe?, I ordered the 640017A carb and will put that one on and save this for one of my brothers tecs that I know will fit , thanks for all your help dont know why it wouldnt work right out of the box but I still dont know how to be a millionair eather ED
 

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Discussion Starter · #16 ·
Rede yes that was the first thing I did no leaks check everything I can think of still dont understand why it wouldnt work at first with air cleaner on maybe my dad came back just to mess with me lol sure miss that old man ED
 
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