Polaris Ask an Expert! In fond memory of Old Polaris Tech. An area where experts in their field will answer non-general questions about your Polaris ATV.
"old polaris tech" and other experts will answer your questions as they have time.
ASK ALL GENERAL QUESTIONS OR BASIC QUESTIONS IN THE POLARIS FORUM.
Basic or General questions posted in a expert section will be moved!

Please comment on my camshaft exhaust lobes

Thread Tools
 
Search this Thread
 
Old Jan 13, 2017 | 11:40 PM
  #1  
Simon Miller's Avatar
Thread Starter
|
Range Rover
Joined: Dec 2016
Posts: 139
Likes: 2
Default Please comment on my camshaft exhaust lobes

I took some pictures of the exhaust lobe of my camshaft. I think it's a bit worn but still good. But I'm no expert. Can you tell from the pictures if it's still good to use?
 
Attached Thumbnails Please comment on my camshaft exhaust lobes-photo129.jpg   Please comment on my camshaft exhaust lobes-photo190.jpg   Please comment on my camshaft exhaust lobes-photo605.jpg   Please comment on my camshaft exhaust lobes-photo355.jpg   Please comment on my camshaft exhaust lobes-photo247.jpg  

Reply
Old Jan 14, 2017 | 05:52 AM
  #2  
old polaris tech's Avatar
Polaris ATV Expert
Retired and loving it!
Joined: Jun 2008
Posts: 24,350
Likes: 44
From: North Texas
Default

From what I can tell the exhaust lobe looks as good as the intake lobes.Not all cam lobes wore down,but quite a few did from from the old Magnum 425s and Sportsman 500s until the HO cams came out .
 
Reply
Old Jan 14, 2017 | 07:32 AM
  #3  
Simon Miller's Avatar
Thread Starter
|
Range Rover
Joined: Dec 2016
Posts: 139
Likes: 2
Default

Thank you!
 
Reply
Old Jan 14, 2017 | 07:58 AM
  #4  
old polaris tech's Avatar
Polaris ATV Expert
Retired and loving it!
Joined: Jun 2008
Posts: 24,350
Likes: 44
From: North Texas
Default

The 4th pic looks the best as far as any excessively worn places on the exhaust lobe. Lobes appears ok. While you're there adjust/check the valve clearance.
 
Reply
Old Jan 14, 2017 | 08:25 AM
  #5  
Simon Miller's Avatar
Thread Starter
|
Range Rover
Joined: Dec 2016
Posts: 139
Likes: 2
Default

The clearance was off. Hopefully explains some of my issues with hard starts, impossible hot starts, some excessive noise, idle issues. The valves were all too tight.

Will put it back together today, need to clean the cover so I can put on a new gasket. First time using a feeler gauge, so I'll double check the clearances I set too.
 
Reply



All times are GMT -5. The time now is 02:31 AM.