Compression test Yammie 225 4 stroke

gerrys

Well-Known Member
Joined
Feb 4, 2007
Messages
272
Reaction score
1
Points
0
Location
vero beach FL
Should this be done with the motor in the water or run tank? I assume doing it on dry land will ruin the water pump...correct?
 

jehines3

Well-Known Member
Joined
Jul 13, 2007
Messages
433
Reaction score
0
Points
0
Location
Maryland, USA
For a motor you own or one on a boat your are considering buying?

The reason I ask is that no matter what the PO tells me I'm changing the water pump. Thus I'd run compression cold, if good, hook up to hose run hot compression, if goo, buy the motor, then change the water pump. You should not be starting the motor so a few short cranking bursts for the first pass buy or no buy, should not overheat the pump or damage the housing. jh