what should be my compression readings on a 99 4 stroke 40 horse

shaneshultz

Recruit
Joined
Mar 20, 2015
Messages
1
I'm looking at buying a 99 model skiff with a 99 4 stroke zuzuki and I need to know what the compression reading should be.
 

hondam

Petty Officer 1st Class
Joined
Nov 21, 2013
Messages
213
They all should be within 10% of eachother. The actual number can vary greatly depending on what type of battery is used, the condition of the starter and battery cables so its hard to give a solid number on what they should be that's why you mainly look at the difference.

Make sure the throttle plates are open when doing compression test, its very important on a 4 stroke.
 
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