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1968 13 whaler - 45 hp mariner compression question
jhuchingson	#1  Posted on 08/02/13 - 9:58 AM
Member Posts: 11 Comments: 0 Joined: 08/02/13	I just bought my first whaler - its in nice condition....just hasn't been used in almost 2 years! It has a 1987 45hp 2 stroke Mariner 4 cylinder. The mechanic is going through it now fixing, replacing & tuning. Compression was 100,110,100,110 - good relative range but not super high absolute numbers. THose numbers ok? close range more important than absolute numbers? - just curious for any commentary or thoughts - would I even know the difference if it were closer to 120 etc.?
Slickityd16t	#2  Posted on 08/02/13 - 10:18 AM
Member Personal Page Posts: 100 Comments: 0 Joined: 03/29/11	As long all the cylinder's are within 10% of each other it's good. 1986 13 Sport - 40 hp Smoker
CES	#3  Posted on 08/02/13 - 12:05 PM
Member Personal Page Photo Albums Project Albums Posts: 2681 Comments: 7 Joined: 04/27/07	Slickityd16t wrote: As long all the cylinder's are within 10% of each other it's good. Bam!!! Nailed it. Cliff 1966 13' Sport with a 1993 40hp Yamaha 2 Smoker
MG56	#4  Posted on 08/02/13 - 12:15 PM
Member Personal Page Posts: 357 Comments: 0 Joined: 05/11/13	Well, if the engine has been sitting your rings could be a little stuck, and that could account for what I think are low numbers. And they really made a 4 cylinder 45hp engine?
jhuchingson	#5  Posted on 08/02/13 - 12:29 PM
Member Posts: 11 Comments: 0 Joined: 08/02/13	and yeah they did - 4 cylinders