2006 90 Yamaha throttle question

[mholman]

I need some help. I recently purchased a 2006 90 yamaha 2 stroke. I installed it and rigged it myself. When I was setting up the throttle, it would not go back to idle when shifted into neutral. After troubleshooting a while, I adjusted the slack in the cable on the control box side. Here is my dilemma....on the engine there is a throttle lever (not sure of the name) where the cable connects to. It connects on the bottom and pushes the bottom of the lever toward the rear of the motor when opened up. On the top of the lever there are two screws with red paint on them. It looks like there is one for the fully closed stop and one for the fully open stop. While troubleshooting, I adjusted the fully closed stop. I set it back where it was, but I may not have it exactly right. It may be off by just a hair. Will this hurt anything if it is not 100 percent accurate? It seems as if it only affects the idle. I tried to go by the red paint, but once you screw it in, it covers the screw when you back it out again. I guess this is how Yamaha mechanics tell if it has been messed with. I did not mess with the full open stop. There is also a linkage adjustment running from that lever to the carbs. I think it opens the butterflies on the carbs as the throttle is opened. I set the linkage back to where I thought it was, but again, I'm not sure if it is 100 percent accurate. When the throttle is closed, the butterflies are fully closed. The throttle has to move about a millimeter (or less) before the linkage makes contact with the piece that opens the butterflies. The boat runs beautifully with no noticable problems. Wide open throttle is running between 4800 and 5200 rpm which is within spec. The motor does "sneeze" on occasion when cold starting, but cranks up just fine. This may not have anything to do with what I did, but I had to ask. My question is...could I have messed something up that may not show up right away, or am I just worrying too much?

 

[rodbolt]

Re: 2006 90 Yamaha throttle question

if your gonna do the work your self why not go pick up the yamaha service manual? it shows how to set the engine up correctly and you need the predelivery inspection sheet properly filled out and signed to validate the warrenty. <br /> odds are its ok, <br /> when you start it are you advanceing the warmup lever?<br /> can you post the engine model number?<br /> have you checked the oil control rod and did you bleed the oil pump,if applicable, before starting?<br />most the time itrs all ok, occasionally its not, thats why yamaha has to have a signed PDI sheet on file or they can invalidate the warrenty at their discrestion.<br /> you need to prop it to turn 5500-5700 RPM.<br />if your gonna monkey with your motor I would suggest using the proper service literature.

 

[mholman]

Re: 2006 90 Yamaha throttle question

Thanks for the reply. I will check on the model number. Where are you getting the data for the rpm's? In the owner's manual it say that wide open throttle should be between 4500 and 5500 rpm. Does a Yamaha mechanic have to sign off on this PDI sheet? No one told me this when I bought the motor. I am considering bringing it to them just to give it a quick glance over to make sure it was set up properly. I did talk to their mechanic as I was installing it and asked him questions to make sure I didn't forget anything. I did not buy a service manual because I don't intend to work on my motor, I just wanted to install it myself. I wasn't ready to buy a motor yet, but the guy made me a deal right before Christmas that I couldn't pass up. My boat wasn't ready for a motor, so I bought the motor in the crate. Once I got the boat ready, I installed the motor.

 

[mholman]

Re: 2006 90 Yamaha throttle question

I almost forgot...The only thing I do at start up is turn the key. I do not push the key in for the choke nor do I lift the throttle lever. Once it fires up, (not sure how else to describe this) if it "seems" as if not all cylinders are firing, I will shut it down. This is where it may "sneeze". When I fire it up again, everything seems to run smoothly. I hope I am describing it right. I know all cylinders are firing, but if I had to describe the sound, that is what it sounds like. I did not check anything with the oil pump. The mechanic told me that all I need to do out of the crate is to add oil to the tank and go. I am running the 50 to 1 premix in my gas for the first ten hours. I only have about an hour or less on the motor.