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Honda GX390 problems


Mister_Foxx's Avatar
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11-04-17, 10:05 AM   #1  
Honda GX390 problems

Hi!
I have a problem with my Honda GX390 that I got for free from my grandpa because it needed new pistonrings. Now I've replaced the piston and pistonrings but there is a looot of friction when turning over the engine and it only has 70 psi compression. I've set the valve gap to 6 thou intake and 8 thou exhaust. Headgasket is also new. Bearings feel good and spin freely
What could cause this?

 
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cheese's Avatar
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11-04-17, 10:21 AM   #2  
Did you check piston ring end gap when you installed them? I assume you properly honed the cylinder and there were no bad spots or gouges?

"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
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11-04-17, 12:48 PM   #3  
Did not hone since the crosshatch pattern looked good. End gap was .4mm as recommended in the shop manual.

 
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11-05-17, 12:27 AM   #4  
The crosshatch pattern is worn down and smooth now, it won't seat in your new parts. It's broken in to the old rings.

"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
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11-05-17, 01:38 AM   #5  
As I said, the honing pattern looked good, maybe it was honed before I got it. But yeah I could hone it again just to make sure.

 
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