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GX160 question


w4uze's Avatar
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Join Date: Feb 2007
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02-10-07, 02:33 PM   #1  
GX160 question

Hi. I have a GX160 on the bench, removed it from a Rokon because it will not idle. I took the valve cover off to check the valve clearance and noticed something peculiar, when I rotate the crank in the running direction, the exhaust valve opens slightly during the compression stroke. Tell me it's not designed to do that, and if it is why?

Thanks, Dan

 
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aj-allen's Avatar
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02-10-07, 03:20 PM   #2  
Compression relief

That's compression relief at starting there is a mechanism on the cam shaft to bump open the exhaust valve so that the engine is easer to start. When the engine is running centrifugal force moves the bump away so there is full compression.

AJ

 
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02-10-07, 04:00 PM   #3  
Okay, I thought that may have been my answer, but I've never seen that before. Wasn't sure if that was causing engine not idleing.

Thanks

 
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02-11-07, 06:54 AM   #4  
Carb ???

Has anyone here tried a different carborator for these GX160 engines? The stock carb doesn't have much in terms of adjustability (idle/highspeed mixture), the idle speed mixture screw has a tab limiting the screw to about 1/16th of a turn. There doesn't appear to be a high speed mixture screw. The float valve is all plastic. Seems there should be something better out there.

 
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09-16-08, 03:41 AM   #5  
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Last edited by w4uze; 09-16-08 at 03:43 AM. Reason: I wanted to..
 
Airman's Avatar
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09-16-08, 06:45 AM   #6  
I suspect a thorough carburetor will cure the idle problem. Here is a Honda document that outlines cleaning. You can improvise the tools they show.

http://www.honda-engines-eu.com/en/images/59138.pdf

 
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