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Location: Chesapeake, VA, USA | I have a 2000 Yamaha 9.9 4-stroke Canadian model that I use as a kicker. It has always been difficult to start, unless I put a thumb over the air intake. Having to take the cowling off to start the kicker is not what I'd like to do in the case of having to use the kicker. I've had the carburetor overhauled professionally and the enrichment gizmo replaced with no change. I recently adjusted the carburetor (the US model appears not to be adjustable) with no change in the starting problem. I'd appreciate hearing from anyone who's been able to overcome an issue like this with this engine. Thanks.
Bill |
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Location: Chesapeake, VA, USA | Also, this is the electric start, high thrust version.
Bill
Edited by bbogue 12/9/2007 7:27 AM
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| I had the same issues with my 2004 Yamaha 9.9hp high thrust. After several calls to the dealer and a few service calls, the mechanic informed me that it was more of a design flaw and these engines were always difficult to start. The end solution was that the engine needed to be primed prior to starting. In order to do this, I put the engine in forward and cranked the throttle handle 5 times. After that put back in neutral and press the electric start. If this does not work, repeat the process. My engine will always start by the end of the second priming. I hope this helps. |
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Location: Chesapeake, VA, USA | Derekd,
Thanks much. I'm going to try your starting method the next time I run the engine. If this works, I'll be extremely pleased. Thanks again.
Bill |
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| I had a 95 9.9 High Thrust with the same problem and got the same advice about twisting the throttle several times before cranking. That helped a bit, but it would start/stall start/stall until it finally warmed up enough to keep running. It was a real pain. Does your 2000 model still use the Prime Start cold enrichment system? This will be a small round black device on top of the carburetor with 2 wires connected to it. If it does, get a jewelers screwdriver and screw the small screw on top of the Prime Start down until it bottoms out and then back it out 3 turns. That is the staring point and you may have to adjust it from there. After I did this, my engine always started and ran with out stalling with in a second or 2 of cranking. |
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| I have a 2006 15hp fourstroke, I have to give it full gas with the choke on in neutral to get mine going when its cold. |
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Location: Chesapeake, VA, USA | ryoung - 12/10/2007 9:34 AM
I had a 95 9.9 High Thrust with the same problem and got the same advice about twisting the throttle several times before cranking. That helped a bit, but it would start/stall start/stall until it finally warmed up enough to keep running. It was a real pain. Does your 2000 model still use the Prime Start cold enrichment system? This will be a small round black device on top of the carburetor with 2 wires connected to it. If it does, get a jewelers screwdriver and screw the small screw on top of the Prime Start down until it bottoms out and then back it out 3 turns. That is the staring point and you may have to adjust it from there. After I did this, my engine always started and ran with out stalling with in a second or 2 of cranking.
Ryoung,
Thanks. Yes, mine does have the Prime Start. I'll try this too.
Bill
Edited by bbogue 12/10/2007 3:05 PM
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Location: Madison, CT | Funny, my 9.9hp High Thrust Yamaha is also hard to start. What helped it a lot was cleaning the Carb.. Most kickers aren't used much, so the gas sits in the carb and gums things up. Yamaha carbs also have very small orefices and the clog easily. You can't clean them by spraying cleaner in them. They need to be disassembled and done right. |
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Location: jax fla, | mine start's fairly easy but hard for it to stay running till it warms up good. |
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Location: Chesapeake, VA, USA | I tried the priming procedure described by derekd. It took 3 tries before my engine started. Next time, I might try tweaking the prime start as suggested by ryoung. The good news is, I can start the engine now without taking off the cowling.
Thanks guys.
Bill
Edited by bbogue 12/13/2007 10:28 AM
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Location: Mystic Island NJ | I've worked at a Yamaha dealer and would not own a small 4 stroke. Honda the same. Every small 4 stroke I've seen was a problem starting. I own a few OMC 2 strokes and they start on the second pull. I'll keep'em forever. Capt.Matt |
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| I had an older 9.9 in a well on a sailboat and it would only start hard the first time in the spring. Are you using fresh gas??? I was always shocked that my old 9.9 would be running before I completely released the starter button!!! |
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| I am glad it is starting better for you bbogue, but please do try tweaking the Prime Start next time. I would just back the screw off 2 or 3 full turns from where it is now and try it. If it doesn't make any difference, you can easily put it back to where it was. If it responds like my motor did though, you will be amazed at the difference in starting. |
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Location: Chesapeake, VA, USA | Ryoung,
Yesterday, I tried the prime start tweak you suggested and the engine started on the first try (after priming, 8 pumps of the throttle). Thanks! Sweet!
Bill |
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Location: canada | 9.9 and 8 Yamhi-thrusts. I have both. Pump ball till firm,, put in gear, give her full throttle and back 3 times, back to neutral, choke on, and start. Should go right away...leave in neutral with some revs for a minnute or so, and they will purr and sip gas all day. |
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Location: marysville wa | my last 9.9 tiller started at the slightest touch of the button as long as it was primed . my new 2006 t8 not as good and was getting worse .
I found the rod the runs from the enrichment solinoid on the engine side gets a little corssion where it connects and moves the choke butterfly . it was sticky and not letting thechoke to come on all the way
finally it got bad enough that choke would stick and pop cowel ect .....you know the drill . dont know if this helps on the 9 hp but look for corrsion and
I put a larger pilot jet in stuborn merc once and solved the hard start issue good luck |
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Location: Arcata Ca | Ok I have a t-8 and readup on the starting woes of the 9.9 before buying. Those all have auto chokes vs manual on the t-8s. There has been alot of talk on this topic at http://www.ifish.net/board/showthread.php?t=153249&highlight=yamaha...
Here is one guys take
I had a 50HP yamaha 4 stroke and a 9.9 HP high thrust yamaha. I loved the 50 and hated the 9.9. It was electric start and auto choke. Terribly cold blooded. Couldn't be relied on to use with fish on off an anchor ball. I had to have the carburetor cleaned every spring even after using Stabil and running the carburetor dry before winterizing. Finally traded it in on a Honda 9.9 and it works good. Having said that i have several friends who have the T8 and they love it. I also know 2 other guys who had the same bad experiences with the Yamaha 9.9. My recommendation is if you want to stay yamaha go ANYTHING BUT the 9.9 auto choke. |
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| That's great news Bill, I know how frustrating that hard starting is. The next time you are out though, you could also try starting the motor without pumping the throttle. I think that you might be surprised. |
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Hard Starting Yam 9.9 4-Stroke
