Kohler back fires though carb


  #1  
Old 10-13-19, 08:27 AM
R
Member
Thread Starter
Join Date: Oct 2019
Posts: 2
Received 0 Votes on 0 Posts
Kohler back fires though carb

Kohler CV490. Initially gas would shoot from the exhaust when starting, but it ran okay. Now it will not start, but backfires through the carb when trying to. I have installed a new carb and plug, and confirmed spark at the plug. Also you can feel compression at the plug port, and smell gas on the plug. Suggestions? Thanks!
 
  #2  
Old 10-13-19, 09:37 AM
M
Member
Join Date: May 2006
Location: Iowa!!!!!
Posts: 4,234
Received 20 Votes on 19 Posts
With the new carb the gasoline out the exhaust stopped and the backfiring through the intake started? Or is there a different order of events?
 
  #3  
Old 10-17-19, 04:51 PM
R
Member
Thread Starter
Join Date: Oct 2019
Posts: 2
Received 0 Votes on 0 Posts
There was backfiring with both carbs. Thanks!
 
  #4  
Old 10-17-19, 06:03 PM
M
Member
Join Date: May 2006
Location: Iowa!!!!!
Posts: 4,234
Received 20 Votes on 19 Posts
It could be the valve lash is off or a stuck intake valve, or a flywheel key sheared. The key would allow the flywheel to advance on the crankshaft messing up the timing.

Flooding an engine can get a backfire like that, but I would check the valve lash first.
 
  #5  
Old 10-17-19, 09:07 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 17,661
Received 56 Votes on 51 Posts
Generally that's caused by a sheared flywheel key on these engines.
 
  #6  
Old 10-18-19, 04:48 AM
B
Member
Join Date: Oct 2015
Location: Ct.,USA
Posts: 2,080
Received 113 Votes on 99 Posts
Have you checked the gap between the ignition module and the flywheel? Should be about 0.010 inches.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description: