Troy bilt hydro lock?

morjam401

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I need some help. I have a Troy bilt push behind 21" 190cc 6.75. It was turning on fine but over reving. I did a small tune up and changed the oil, plug, and filter. Now it's almost impossible to pull the starter rope. After watching some videos I saw the mention of hydro lock. When I remove the plug the string pulls just fine. I pulled it a few times trying to remove any fluids as suggested but nothing came out. That's one issue. I did somehow manage to get it on once after a good struggle. The rpm's are still super high. There is a bar on top with a spring that I moved manually and the rpm's went down. I'm not sure if the spring lost tension and that is what maintains correct rpm's? It's about 8 years old. Worth saving?
 

MowLife

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The arm/rod should go to the governor which controls engine speed under different loads. Check to make sure it is adjusted correctly and any springs are working and present.
 

morjam401

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The spring is present and the lever is free moving no tension really. I am not sure how to adjust it? Any ideas on the pull issue/hydro lock? Plug out moves fine, as soon as insert and not even tighten plug it's impossible to pull string.
 

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SeniorCitizen

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Remove the plug wire to determine if it pulls easier.
 

MowLife

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You may have internal problem being it’s revving high and not releasing compression correctly. I would pull the valve cover and watch valves opening and closing by spinning motor by hand. You may have a valve stuck closed or a bent pushrod not allowing decompression. This would cause hard starting. The revving is another issue.
 

Scrubcadet10

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You may have internal problem being it’s revving high and not releasing compression correctly. I would pull the valve cover and watch valves opening and closing by spinning motor by hand. You may have a valve stuck closed or a bent pushrod not allowing decompression. This would cause hard starting. The revving is another issue.
x2, very well could be a valve issue.


And it looks like you have a Briggs auto choke engine, here's a video that explains how that works etc. https://youtu.be/YAqVcdZOZE4?t=207
 
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