OMC / 200hp Johnson questions

[JeffXJ]

This is about the V 21 that Reel looked at for me. It has a 1996 200hp Johnson Ocean Runner and the power head is suppose to have been replaced with a new one in 2006. When they did the compression check on it the numbers were:
#1 - 95
#2 - 80
#3 - 92
#4 - 80
#5 - 85
#6 - 76

The compression on #6 seems a little too low and when they pulled the plug on it Reel said there was a lot of carbon build up. Bare in mind this is suppose to be a new (well, ok a 1 year old) powerhead. Is there some kind of break-in time or service that is needed? What are the possibilities for the low compression? What might cause the carbon buildup? What should be looked at / checked out based on these numbers?

Reel did say when they took it out for a ride the engine ran good, but they think it might not be propped correctly since they couldn't get it above 4600 rpms.

Any help would be greatly appreciated. I'm seriously considering buying this boat, and want to make sure all things are addressed before I make an offer.

[Skools Out]

that hole 6 needs rings bad hole. i just re-ringed a 225 that had 89 to 90 on all cylinders but #3 and it had 77 well when i opened up the motor bad cylinder. burnt cylinder and rings. i'll get a pic of that piston. factory is 90 psi but*the reason for no RPM's it's the bad cylinder.

[JeffXJ]

Thanks Skools! That brings up another question, though. If it needs new rings, should it be done on that whole side, considering the whole side is kinda low, or just that cylinder? And any idea of how much whatever the proper fix would cost?

Also, any thoughts as to why a "new" powerhead would burn the rings out so soon?

[Skools Out]

well may not have been broke in correctly with double oil first 25 hours and it should have all re-ringed while you have it open and that bad hole may need alot of honing to get the scoring out of the cylinder, plus will need new piston

[JeffXJ]

it should have all re-ringed while you have it open

Just that side, or all 6 cylinders?

[macojoe]

All 6 cause if they have to hone to much they will have to put over size pistons.

NADA give that motor a $2400 vaule, tell him to take it off the price. Then you have the cash to fix or replace with something else, granted it won't be new but there are some nice motors for $2500, and in a couple of seasons you can upgrade.

When ever I look for a boat, I find the perfect boat and junk motor, or Great motor with junk boat.

Good Luck!

[phester]

I agree w/ what MJ just said.....those compression numbers do not sound to good for a "new powerhead"

[THEFERMANATOR]

I did a compression test on a 225 EVINRUDE before with only 3 hours on it from some side shop, the numbers were scary.
#1-95 #2-105
#3-45 #4-85
#5-85 #6-95

[macojoe]

This the reason I am not doing a test on mine!! I have the tool and all But I keep telling CB I don';t want to know as long as it runs I am happy!!
I don't need to know I have another problem this late in the game!!

[THEFERMANATOR]

MJ, so long as she starts good I wouldn't worry with it. CROSSFLOWS normally get hard to start when they get tired.

[macojoe]

Thats great news!! Cause she starts like hitting a light switch! ;)

[Skools Out]

here's pics of the piston and motor that has 77 psi and look how bad the hole was

http://i8.photobucket.com/albums/a46/Skools_Out/Motors/MVC-016S.jpg

http://i8.photobucket.com/albums/a46/Skools_Out/Motors/MVC-015S.jpg

http://i8.photobucket.com/albums/a46/Skools_Out/Motors/MVC-014S.jpg

http://i8.photobucket.com/albums/a46/Skools_Out/Motors/MVC-017S.jpg

http://i8.photobucket.com/albums/a46/Skools_Out/Motors/MVC-018S.jpg

http://i8.photobucket.com/albums/a46/Skools_Out/Motors/MVC-019S.jpg

Here's the reason it did this the cap in the reed body cracked and let it suck air in and leaned out

http://i8.photobucket.com/albums/a46/Skools_Out/Motors/MVC-020S.jpg

but remember i only paid $49.95 for the whole motor and then took out the pistons re-ringed and put in a piston and new head gaskets, i have total of $94.15 in it. and now has 98 to 102 on all cylinders in compression.

[JeffXJ]

How bad was the cylinder wall? Did it take a lot of honing to make it right again?

[Skools Out]

no not really it looked just like the piston same shape. i bar honed to get round and no scores and then ball honed both directions (a must on 2 strokes) to smooth out the ports edges then installed new piston and rings tested compression and has 102 PSI so better than factory.

[Bygracealone]

Skools, you did all the honing yourself? Impressive!

We sure do have quite a bit of talent on this forum. We should have an annual workshop conference at Skool's place. It could be 3-5 days and cover areas such as two stroke maintenance and repair in addition to a class on creative fiberglassin' ;D

What do you say Skools? We could pitch tents in your yard.

[randlemanboater]

Good idea BGA, but lets make it in the FLA Keys instead. ;D

JEFF,

You can find a better V for the kind of money that they are asking for that one that you won't have to fix before you splash

[JeffXJ]

You can find a better V for the kind of money that they are asking for that one that you won't have to fix before you splash

That's what I was expecting when I first started looking at this one.

I've been trying all week to get back in touch with them, because for the right price I might still be interested. Unfortunatly I haven't been able to talk to them since. Either no one answers or the person I was dealing with isn't there.

[Skools Out]

yeah i honed her out and cross hatched the cylinder and put back together. i love it when a plan comes together. BGA you should have bought this motor and resold since it was 15 min from ya and only cost $49

[Bygracealone]

Well, I didn't know about it AND I would be calling you every step of the way anyway. Soooo, you deserve it bro. ;) A good guy gotta good deal.

[Skools Out]

well tanks and jeeps there bro

[reelapeelin]

Jeff...interesting they're not answerin' the phone in Rock Hill!? ::) ...wonder what's the deal there?...ol' Tommy take a powder on ya?... if ya don't get him next time, ask for Steve...the Tec I went to lake with ...

[JeffXJ]

His daughter answered Monday and said he went home sick and when I asked her if she knew anything about the boat she (in a sorta short and impatient way) said no. I think the family charm might've been lost on her. Tuesday I didn't get home in time to call. Wednesday no one answered, Thursday he still wasn't in, but this time his daughter seemed in a better mood and said he may be in after 10am today. Talk about dragging something out....

[reelapeelin]

Hang in there...if it's meant to, it'll happen ;) ...