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Discussion Starter · #1 ·
Will not wind up to max RPM with out pulling the primer knob out. With it out she runs wide open. What gives?
 

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Discussion Starter · #3 ·
So what is it bypassing by opening the primer?
Doesn't this eliminate an air leak in the fuel line/bulb/tank, etc.?
 

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Living & Dying in 3/4 Time
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If you take off the cowling and the black plastic piece covering the carb throat you'll see what the primer knob does. Pulling the knob out closes a butterfly like flap, limiting air into the carb/motor.
 

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Informative read...better than me trying to type... ;)

http://www.smallenginesrepairs.com/small-engine-choke.html
 

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Discussion Starter · #6 ·
Thanks guys. That link should help alot!
 

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Is this the same motor you had the same problem (Not turning all the way up) a few weeks back? I thought you put a Control Module on it and fixed it?
 

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Discussion Starter · #8 ·
You are correct! Had a mechanic diagnose/install that fairly pricey little beauty.
Ran much better but never felt "right". This last trip it started this new problem.
 

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its the carb
pulling out the choke (or primer knob as it called on this one) closes the intake tract and pulls more fuel through the venturies in the carb and thats why it runs better tear the carb down, dip it and reassemble with a new carb kit

dont run it like this anymore untill you rebuild the carb or youll burn up a cylinder or a piston because as it is now its running lean
 

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Discussion Starter · #10 ·
Did just that levi. Sort of. Didn't do a complete rebuild, but found a couple of screws on the side plate of the fuel pump loose and the gasket on the bottom of the bowl was iffy. Tightened screws and replaced gasket.

Did a quick test run today and it ran great.
 
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