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Author Topic:   Repowering W/Yamaha 90
jstarzy posted 01-20-2003 06:08 PM ET (US)   Profile for jstarzy   Send Email to jstarzy  
I've just bought an '03 90HP Yamaha and will be swapping it out with a Yamaha 70 I will be selling. Any tips on how an 03 90 will swap with the 70? Also...I have bought a new digial tach and start switch. Wondering what the Primestart AutoChoke system is and what I can expect will be different from the 70 that had a toggle switch. What does the key-push switch on the new key assembly do? Thanks alot. Any help is much appreciated. Oh...the boat is an 89 Montauk.

Jim.

Bigshot posted 01-21-2003 09:22 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Swap out will be easy. Key switch does the same when pushed as you toggle did. I suggest you study the owners manual.
jstarzy posted 01-21-2003 04:05 PM ET (US)     Profile for jstarzy  Send Email to jstarzy     
Bigshot....thanks for the reply. The 2003 Owner's manual does not state anything about pushing in the keyswitch. Nor does it explain Primestart in anyway. I checked this a while ago. From some of the info I've pieced together on the net, it seems Primestart chokes the engine much like a carb on a car...by temperature. Unfortunately, all the manual states is to turn the key to start and return it to the run position when the engine starts. I'm not kidding!...Does anyone know of any articles on the net that may explain Primstart in depth? Thanks.

Jim.

Bigshot posted 01-21-2003 04:23 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Maybe they did something like that....should not be hard to tell when you go to start it. If it starts right up....then choke is automatic. If it does not or eventually starts and pushing in the key stalls it, then you need to push in key to choke.

Is this a 4 stroke or 2 stroke 90hp. If a 4 stroke you probably do NOT need to push in the key if fuel injected, etc.

LiquidDiet posted 01-22-2003 12:50 PM ET (US)     Profile for LiquidDiet  Send Email to LiquidDiet     
the toggle switch is the choke on that yamaha motor. Pushing the key in will accomplish nothing. I had a 1991 115 Yamaha with the same set up. Confusing at first since on most outboards push key in for choke. In regards to prime start it is simply a warm up feature. Theoritically, the new yamahas should not need choke, but I would not count out choking a cold carb outboard.

LD

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