my compression sucks?

[bryanhumpy]

just tested my compression on my force 120 L-drive.

#1 122
#2 97
#3 65
#4 120

so what now? am I screwed or what?
any one rebuild one of these?
is it beyond help
I'am so sad
someone help please

 

[MAW31]

Re: my compression sucks?

ya, that kind of discrepancy is very bad.

are you using a reliable compression tester?

its very probable you've got internal damage and yes, repair will be necessary.

take the heads off to have a looksee at the damage and assess from there.

 

[bryanhumpy]

Re: my compression sucks?

Ya brand new compresssion guage just purchased.
dont know if i am able to tear her down never done a powerhead before.
I guess what do i have to loose..... summer's on the way
the other option is to push the boat into the street and let the cops pick it up...lol
well i wanted a project ....hahahahahah

I've heard about this seafoam stuff
or is that just wishful thinking
boat has been sittin for about 2 years

 

[kend301]

Re: my compression sucks?

If the boat has been sitting pull the plugs , Spray WD40 into each cylinder a n rotate by hand , do this 2 or 3 times and put the plugs back in , let it sit for 2 days and recheck compression after running . Rings just may be stuck .

 

[foodfisher]

Re: my compression sucks?

Search decarb, do it and hope

 

[Frank Acampora]

Re: my compression sucks?

Since two cylinders are bad--forget about wasting time with seafoam--it will not improve.

So: since two cylinders are bad, you may as well bore and replace all four for a brand new engine. Approximately 500 in pistons, 200 in overbore charges and another 50 for gaskets. Price for pistons I am quoting is Wiseco. They come complete with rings and wristpin.

Since you never did a powerhead before, figure 10 hours to disassemble and 10 to reassemble. No special tools other than a torque wrench and flywheel puller are needed. If you can tie your shoelaces, you can do the rebuild.

Oh, yeah! Helps a bit if you have access to a hydraulic press to press out the wristpins.

 

[bryanhumpy]

Re: my compression sucks?

OK.. i'm ready to give it a shot..
yes i can tie my shoe laces
i'm pretty mechanically inclined... (famous last words) lol
I'm gonna order a manual tonight. thanks for the advice

 

[GrindKore]

Re: my compression sucks?

Hey, I was facing similar issue few years ago (http://forums.iboats.com/showthread.php?t=266436). With some expert advice from Frank and others, I got my Force 90 working. Now going on to 3rd season after replacing pistons and hope to get few more.

 

[JustJason]

Re: my compression sucks?

run some mercury power tune through it as perscribed on the can. If the numbers don't go up and be even then you have a scrapper.