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Author Topic:   question about a small yamaha
hardensheetmetal posted 01-13-2003 05:52 PM ET (US)   Profile for hardensheetmetal   Send Email to hardensheetmetal  
I just picked up a 1998 yamaha 6 2 stroke. The motor looks as if it has never been used, aside from a few small scratches in the cowling. I attempted to start it today in my garage. I attached the muffs, prime it, and it started up after 4 or 5 pulls. My question is this; does this motor shoot cooling water just like a larger motor. I have located a small exit port that is maybe 1/8" round, on the underside of the motor. When I started the motor, the small port showed one drop of water, no constant stream. I shut the motor off right away. The small port is inaccessable from under the cowling, because it is below the block (which mates directly to the lower unit)...should there be water shooting out, or does the cooling water exit elsewhere, like through the prop?


weekendwarrior posted 01-13-2003 06:24 PM ET (US)     Profile for weekendwarrior  Send Email to weekendwarrior     
I'm sure some water will go through the prop to cool the exhaust, but I would be surprised if a water cooled motor that size didn't have a visible stream somewhere. It's possible that it may take a few seconds to fill with water (my old mariner took about 10 seconds at idle before I saw a drop). Did you let it run more than one or two seconds? Also can you use something soft (like stiff 100# mono or weed whacker string or something similar) to clean what you think might be the port? Maybe a mud dobber or something built a nest in there. Hope this helps..
hardensheetmetal posted 01-13-2003 06:31 PM ET (US)     Profile for hardensheetmetal  Send Email to hardensheetmetal     

Thanks for the reply, I let it run first for about ten to 20 seconds before shutting it off, then for about anout 10 or so.

I will try to see if anything is plugging the opening, and then report back with my findings.


fester posted 01-13-2003 07:51 PM ET (US)     Profile for fester  Send Email to fester     
I believe you should see a stream of water from the exist port. Is not that unusual for the port to become clogged. I have a 9.9 Evinrude and the exit port seems to clog every year or two. Sometimes I am able to clear it with the line from my weed wacker. Once this did not work so I used my air compressor and blew some air up through the exit port. Cleared it right out.
SSCH posted 01-13-2003 10:11 PM ET (US)     Profile for SSCH  Send Email to SSCH     
I had an older version of the Yamaha 6hp. It had a visible stream and I agree with Fester. Try to run a piece of heavy leader (or if you want, weed wacker string) up the port you believe is for the stream. The stream on mine was every bit as strong as the stream on my 200 Yamaha is today, when it was running right.
hardensheetmetal posted 01-13-2003 11:09 PM ET (US)     Profile for hardensheetmetal  Send Email to hardensheetmetal     
Thanks everyone,

I figured there should be something, but just wanted to make sure. There is also a small port toward the back of the motor where the exhaust usually exits, it lies next to a bigger port that shows some carbon build-up around it, so I assume that is the exhaust, any idea what the smaller one might be.

It would probably be well worth the few dollars for me to invest in a manual for this little one.


Bigshot posted 01-14-2003 09:45 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
If engine is not getting hot, then hole is clogged. My 9.9 and 25 would clog daily with what I have no idea. If you can run it 30seconds and she is still not too hot to touch, she is getting water. Try the wire and then an air shot if possible(even a WD40 shot through a red tube thingy, etc. If not do a pump to be on the safe side. If the engine is that clean I would just replace the impeller, not the whole pump. This gives you peace of mind and allows you to lube the shafts and change the gear oil while at it. yamaha lowers are easy to drop.

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