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  9.9 Yamaha four stroke Hi Thrust

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Author Topic:   9.9 Yamaha four stroke Hi Thrust
JohnM posted 06-02-2003 11:24 PM ET (US)   Profile for JohnM   Send Email to JohnM  
I purchased a new kicker motor for my 22-Revenge and had it out for the first big trip this year. I have a 6 gallon plastic portable tank. It ran great for about 3 hours then started to lose its prime and shutdown. Had to pump up squeeze bulb and it would start and run for 5 minutes and would shutdown. Went like that all day. I installed a new Yamaha fuel hose, with the arrow pointing in the right direction, and was thinking I may have a bad check ball in the squeeze bulb. I also pulled the hose attachment off the tank to check the gasket to see if I was sucking air and the drop tube with tank screen fell of inside the tank. I got it out but it just slides onto the fitting and nothing secures it in place. I think when the fuel level drops below that level it may be sucking air through that loose connection. When I squeezed the bulb you could hear it bubble in the tank!! Topped off the tank and didn't have any problem for about 4 hours of trolling. This is my first experience with a Yamaha motor and a plastic tank. Only used 3 gallons of gas for 16.5 hours trolling. Does anybody have any advice or had any similar experience?
andygere posted 06-02-2003 11:34 PM ET (US)     Profile for andygere  Send Email to andygere     
Why not run the kicker off the main tank? If you have a water seperator/fuel filter, there is probably an extra port to run a fuel line to your kicker. My Montauk and Outrage are both set up this way. It works great and you don't have that plastic tank cluttering up the deck.
where2 posted 06-03-2003 12:24 PM ET (US)     Profile for where2  Send Email to where2     
Still breaking in our new 15Hp 4Stroke Yamaha. At 2 hours, it looks like we've used maybe 1.2 gallons of fuel... I'll let you know if the drop tube looks well attached... I just filled the tank with Gas on Thursday, didn't think to look at the screen...
kingfish posted 06-03-2003 02:42 PM ET (US)     Profile for kingfish  Send Email to kingfish     
I'm with Andy - we have your exact kicker on our other boat, run by a 225 Yamaha, and I did just that: ran a second hose from the second port on the water seperator/fuel filter. The only caveat I'd add is that if you go that route, you ought to istall petcocks for each fuel line right at the filter, so you can isolate the fuel flow to the motor you are currently using. It is possible under some circumstances to draw air back through the carbs on the kicker into the fuel line for the main motor without some system to prevent it.

kf

jimp posted 06-03-2003 02:44 PM ET (US)     Profile for jimp  Send Email to jimp     
JohnM -

I'm running a 1990 Yamaha 9.9 4-stroke, hi-thrust, electric on a 1990 Revenge 22 WT. I am running it off the main tank as Andy described... It will troll all day at idle with no problems. When I'm finished for the day, I bring it up to wide open and run it for a few minutes. It runs fine, then dies. I pump up the squeeze ball (that was soft), and she starts and runs fine.

No advice for you. Mine does the same thing (but not at trolling speeds), but running off the main tank.

JOHN W MAYO posted 06-03-2003 06:52 PM ET (US)     Profile for JOHN W MAYO  Send Email to JOHN W MAYO     
A selector valve would work also to switch from the Main engine to the Kicker. Tempo makes one for about $20. I just added one to my back-fuel tank to my revenge to make for even a quicker fuel tank change while underway.
Barnett Childress posted 06-03-2003 10:31 PM ET (US)     Profile for Barnett Childress  Send Email to Barnett Childress     
I'm running the same setup on my Montauk. Yamha 90HP 2S and 8HP hi-thrust 4S plumbed from main tank to water/fuel seperator. Each engine fuel line from filter has its own shut off valve. Setup works great. I've had no problems running kicker at 1.5mph all day then bumping up the throttle. Kicker runs fine at all speeds.
Barnett
JohnM posted 06-03-2003 10:41 PM ET (US)     Profile for JohnM  Send Email to JohnM     
I am running a 1983 175 Rude for main power so I am stuck running mixed fuel in the 72 gallon tank. I did have a mixed 15 hp Johnson running off another port. Got tired of getting smoked out with the top up. Also had to run 15 hp at about 3/4 throttle to troll and it wouldn't keep up with the wind. I think the problem was in the plastic tank. As mentioned in my original post the drop tube fell off when I pulled the hose attachment off. It ran fine with a full tank and when it dropped below the stem level it started sucking air. One of my buddies who bought my old 15 hp, threw away his old metal tanks which seem to last forever, and bought a new plastic tank and hose and mentioned he spent all day Saturday squeezing the Bulb on his and couldn't figure out what was going on!! He also had about 3/4 tank left. He will be checking his tonite. Appears to be a common problem with plastic tanks. By the way, it is a Yamaha tank with a Yamaha hose. At some point I will be purchasing different main power but the big Rude is running great and even though a little underpowered still gets me by in rough water.

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