Older Tecumseh H70 tweaking carb - Snowblower Forum : Snow Blower Forums
 
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post #1 of 4 Old 01-09-2017, 01:54 PM Thread Starter
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Older Tecumseh H70 tweaking carb

I have an older H70 (I assume, can't read any models off the engine) and I bought a replacement adjustable carb off ebay. I have the unit running but can't seem to tweak it well enough to run without a slight sputter or surge. If I start with the 2 turns out for the top screw, and 2.5 turns on the bottom float bowl screw the engine runs but puffs smoke and won't rev up enough.

I follow the advice and start playing with the bottom screw to the point it doesn't puff smoke anymore and RPM goes up and seems to run better. Problem is when I have it running what seems like really well, the engine will stall if I change speed on the engine so I assume it's messing with the fuel delivery and I have the screw closed too much.

I tried tweaking it some more where I have a compromize between engine running a little rough but I can speed it up or down without stalling but the engine surges a bit and I can see the engine governer moving slightly back and forth and won't settle.

Does this mean the carb probably isn't design for my engine?
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post #2 of 4 Old 01-09-2017, 02:20 PM
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Start with 1 turn out for side idle screw and 1 1/2 out for bottom high speed screw. When started, adjust bottom screw for highest speed. Report back. Don' t worry about governor. MH

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post #3 of 4 Old 01-09-2017, 04:58 PM
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Try Adjusting the side screw for fluctuating RPMs.
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post #4 of 4 Old 01-18-2017, 10:22 AM Thread Starter
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Tried different turns based on the posts above and was able to get it running much better.

Thanks for the help.
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