If you are selling a boat with a motor or motor separately you might want to have more than one place do a compression check on the motor if you are not satisfied with the results from the first check. I recently had my motor checked at two reputable places in Fort Worth and the results were not even close.Always good to get a second opinion when having motor issues.

U also can buy a compression gauge for not much and do it urself. Thats what i did last time

From what I hear you need to also do a leak down test.

The actual numbers on the compression test don't matter as much as the variation. Gauges you buy for "reasonable" prices are no where near calibrated to be actually accurate. For example, if you pull out your O'reilly's gauge and the 6 cylinders are 103, 105, 102, 101, 104, and 105 but then you slap in your Summit racing gauge and it shows 121, 123, 119, 120, 121, and 121, neither actual number is what you are looking for but the variance is excellent and within a 3% range which is excellent.


Now if you buy a Snap-On gauge and have it calibrated annually, THAT is the gauge you want to use to check comparing to the service manuals minimum serviceable compression. Cheap gauges, just look for variance from cylinder to cylinder. Also, the engine needs to be at full operating temp and the throttle wide open for each cylinder to achieve accurate results.

I am not a mechanical type of guy.I took my motor to two reputable dealers that we are supposed to trust and one said my motor was worn out after 340 hrs and that is normal and gave me really low compression numbers and the other said BS and that there was nothing wrong with the compression and the hours were low for a motor.Now,I am confused.How many hours should you expect out of a properly maintained motor. Can't justify buying a new motor if it won't last more than 300 hrs.

Had the compression checked on our boat last year due to motor trouble...I won't say where but the first place told us we had NO compresstion at all and it was going to cost 7500 or we would have to buy a new motor, went out of town and had a second guy tell us the compression was fine but he would fix everything that was wrong with it and give us a 5 year warranty for 3800..needless to say I was dissapointed in the first place, especially due to their upstanding reputation.

Do not go back to the guy that told you 340 hrs is normal for a "worn out motor". Some ourboards will get 1000's of hours on them before they blow up. It will depend on how they are treated.

300 hours is nothing there Bullsh8ttin you!!!

That's what I thought and why I went and got a second opinion.

You should get 1500 or more without question as long as you are maintaining it properly. PM me the place that told you otherwise so I know not to waste my time dealing with them. I can recommend a few mechanics that I trust if you're interested. Lord knows there are quite a few quacks and cheats out there, I've had the displeasure of dealing with some myself.