Catalina - Capri - 25s International Assocaition Logo(2006)  
Assn Members Area · Join
h.jpg Home.
a.jpg Association Forum
s.jpg Ships Store
c.jpg Cruising
r.jpg Racing
t.jpg Technical Tips
g.jpg Photo Gallery - New
o.jpg Boat Search - Updated
m.jpg Manuals & Brochures
3rdrpt.jpg Swap Meet
l.jpg Links
f.jpg Officer Flag Line & Staff
b.jpg Bylaws & Constitution
 
1.jpg Members Area
1.jpg Join the Association
 
Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
 
Association Forum
Association Forum
Home | Profile | Register | Active Topics | Forum Users | Search | FAQ
Username:
 Password:
Save Password
Forgot your Password?

 All Forums
 Catalina/Capri 25/250 Sailor's Forums
 Catalina 25 Specific Forum
 Yamaha 9.9 WARNING...		  New Topic  Topic Locked
 Printer Friendly
Author Previous Topic Topic Next Topic  

Gary B.
Admiral

Member Avatar

USA
969 Posts
Initially Posted - 07/21/2006 :  10:16:18  Show Profile
I did not delete this because I got a nearly immediate response, but a longer thread is on the general forum where I should have posted in the first place.

First off....let me say that I LOVE my Yamaha 9.9 four stroke high thrust, long shaft electric start. I think my current one is a 2000 model, but I earlier bought a 1985 model when they were quite new to the market.

HOWEVER, my first one "burnt" up/froze and had to be rebuilt. I never knew why. Then, about 2-3 years later, it did it again....I then realized that the crankcase was full of oil and gasoline MIXED. I was told the choke had stuck and that gas had gone down through the rings into the crankcase.

About the same time, this happened to a friend's boat, just as we were getting ready for a 130 mile coastal trip down the WA coast and over the Columbia River bar. We got it "unfroze" finally, changed oil twice (with bearing material in the oil/gas mixture). Somehow, the engine ran enough for us to get home before the needed rebuild.

THEN, just last week, I checked the oil in my Yammy. It was OVERFULL on the dipstick. I smelled it and, sure enough, there was GAS in the oil.

I changed it immediately and visited the dealer. He told me it was most certainly a "thermostat" problem. The engine was not heating up enough to expand the piston and rings, so the gas was going down the cylinder wall "making oil".

Luckily, I caught it in time this time. I seriously suggest that you Yamaha owners check oil levels often and watch for this.

Also, I think replacing the thermostat should become (as I have NOT done) a regular "maintenance" item. The dealer told me it should be done once a season, according to the book.

I LOVE these engines for their power, quiet, efficiency, etc. in spite of their weight. But THIS issue is a serious one; I know from too much experience over the last 20 years. Good luck!

Gary B.
s/v Encore! #685 SK/SR
Edited by - Gary B. on 07/22/2006 09:55:30

Larry
1st Mate

Members Avatar

USA
37 Posts
Response Posted - 07/21/2006 :  11:15:47  Show Profile
Thanks for the heads up!
Edited by - on
Go to Top of Page

EAbrams
Navigator

Members Avatar

USA
130 Posts
Response Posted - 07/25/2006 :  15:39:03  Show Profile
Thanks, I own a 1986 model
Edited by - on
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Topic Locked
 Printer Friendly
Jump To:
Association Forum © since 1999 Catalina Capri 25s International Association Go To Top Of Page
Powered By: Snitz Forums 2000 Version 3.4.06
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.