Polaris ATV Forum banner
1 - 3 of 3 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter · #1 ·
Hello everyone, new to the forum here. Just got a 2016 Ranger 570 in the shop for a valve job. not starting. Got in there and all valves were in spec other than one of the exhaust valves which was at .017 which is the furthest out of spec ive seen on an engine this new. any idea what would cause this? also does this alone sound like enough to cause it to not start?
 

·
Registered
Joined
·
13,457 Posts
The clearance may indicate a stuck or bent valve, but the mechanic will know when the head is removed to perform the valve job. When the valves have been replaced, lapped and the clearance set, the engine should start and the clearance will have been corrected.

If you want to know if the valve is the cause of the problem prior to the valve job, the mechanic should perform a cylinder pressurization test to determine if the valve is leaking - if the valve is not leaking, then it is not the cause of the no start problem and excessive clearance will not prevent starting unless the clearance is caused by the valve being unseated (hung open).
 

·
Registered
Joined
·
2 Posts
Discussion Starter · #3 ·
The clearance may indicate a stuck or bent valve, but the mechanic will know when the head is removed to perform the valve job. When the valves have been replaced, lapped and the clearance set, the engine should start and the clearance will have been corrected.

If you want to know if the valve is the cause of the problem prior to the valve job, the mechanic should perform a cylinder pressurization test to determine if the valve is leaking - if the valve is not leaking, then it is not the cause of the no start problem and excessive clearance will not prevent starting unless the clearance is caused by the valve being unseated (hung open).
Thank you. Makes sense
 
1 - 3 of 3 Posts
Top