1988 Evinrude E225TX 225hp compression issues.

[shackle101]

Hi all I got this engine on a 22 ft deck boat and I noticed some issues when out on the water it seems to be sputtering at full throttle (ran fine a majority of the time till we got ready to leave) kinda like it's losing power. I notice the water pump isn't spraying very hard. Good amount of water is coming out but it's not spraying out like you normally see. So I did a compression test when I got it home and I got mostly 90-87 psi on all, but 1 which tested 70 or so. I let the engine warm up before doing that. I also tested again with a little mystery oil in the cylinder and still same results. So basically I have a worn cylinder or piston here? Do I need to just replace just that one? Also could it be just stuck I was hoping the mystery oil after sitting for awhile may clean it up. The engine has been sitting for about 2 years and it was supposedly rebuild 2-3 years ago.

Thanks for any assistance or suggestions you guys can provide.

 

[shackle101]

Also I did some research and it seems it's common for these engines to run low compression 90-100 psi brand new apparently? Does anyone know if this is actually true. Should I try hooking up a little tank and using like seafoam? I also have some Yamaha ring free, but not sure if that's ok to use in a Evinrude? Looks like I should certainly replace the water pump too. Just want to know if this engine will be worth the effort.

 

[shackle101]

Guys anything here?

 

[emdsapmgr]

The Yamaha ring free is supposed to attack the carbon buildup inside the cylinders and around the ringsets, just like the Bombardier Engine Tuner product. I'd get a can of the Engine Tuner and the special applicator hose (sold separately.) The nice thing about that can is that it can be direct injected through the Schrader valve at the choke solenoid. Makes for a very easy application process. Do a couple of applications according to the instructions on the can. You may find the compression will come up somewhat and you may find it will idle/start better. Compare the after compression readings with the original reading. Unfortunately, your primer solenoid does not have that Schrader valve from the factory. Guess is came out a year or so later. May be worth it to swap that valve out with a new one from Bombardier: 175158. It's around $8 and worth the expense.