Honda GX390 problems

Reply

  #1  
Old 11-04-17, 10:05 AM
Member
Thread Starter
Join Date: Nov 2017
Location: Finland
Posts: 3
Question 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?
 
Sponsored Links
  #2  
Old 11-04-17, 10:21 AM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,818
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?
 
  #3  
Old 11-04-17, 12:48 PM
Member
Thread Starter
Join Date: Nov 2017
Location: Finland
Posts: 3
Did not hone since the crosshatch pattern looked good. End gap was .4mm as recommended in the shop manual.
 
  #4  
Old 11-05-17, 12:27 AM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,818
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.
 
  #5  
Old 11-05-17, 01:38 AM
Member
Thread Starter
Join Date: Nov 2017
Location: Finland
Posts: 3
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.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes