Super Jet 90 Squarenose build

[Kohldanielzimmer]

Here is my first yamaha. Ski is finally done for the moment. I had it ported, rerung, set up and tuned by a reputable builder in the area. All new seals and gaskets including the pump seal. Attached are some pictures.

Build list: Ported 61x barrel and 61 x cases
rejetted oem carb (120 low 150 main and a 2.0 N/S i think a 90 gram spring) with a hot products F/A removed the choke and installed primer
factory limited pipe with port matched exhaust mani
OEM modified CDI for no rev limit and reliability
650 head to bump compression
Carbon Tech Reeds
Dual Cooling to the mani and head with independent pisser for pipe and head. restrictor in stinger.
61x aluminum exit nozzle to reduce thrust flex of the 1990 plastic exit nozzle
10/16 hooker impeller
Jet dynamics top loader intake grate

 

[Byeai]

Nice anything u going to do to the hull

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[Kohldanielzimmer]

 

[Kohldanielzimmer]

No footholds for me. I plan on truing the bottom hull. Other than that no hull mods yet.

 

[WB1994]

I wouldnt run waterlines off the head like that if your running a stock headgasket.

 

[Kohldanielzimmer]

I didnt set up the engine so I couldn't tell you what head gasket it has. The ski runs great. The guy who built it has been building race skis for 25 + years for guys like aaren Davis. By no means am I saying you're wrong WB1994: what's your concern with it though?

 

[icecoled007]

Looks good, you should do the hood mod to keep water out of that nice motor.

 

[WB1994]

The head gasket guides the water a certain way so you need the waterlines to exit the head on the exhaust side. You could be creating a hot spot on the exhaust side of your motor running the waterlines the way he has it with a stock gasket.

 

[Kohldanielzimmer]

interesting I will discuss it with him and see what his thoughts are. Thanks for the tip.

 

[garretonufer]

The head gasket guides the water a certain way so you need the waterlines to exit the head on the exhaust side. You could be creating a hot spot on the exhaust side of your motor running the waterlines the way he has it with a stock gasket.

why the exhaust side? most AM heads have outlets on carb side... input is on the carb side. I would be concerned with the head getting too hot as your pulling the water out before it gets to the head, creating a hot spot in the gasket, so i don't question that logic. just curious on the reasoning for water outlet being on the exhaust side.

 

[Byeai]

Ha garret leave him alone lol jp yea every motor ive seen outlet is on carb sode

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[Kohldanielzimmer]

The way it runs feels right but I'm not discrediting anyone's suggestions or insight

 

[Kohldanielzimmer]

Time to update the steering and controls. What are some suggestions for steering, bars,grips and a finger throttle. I was looking at a full umi setup for the steeering plate. What bars can you run with it? Is it worth it? Finger throttle: I was thinking protec or umi? For grips I was looking at ourys and Odis..
I would like something that is transferable to alum pole if I go that direction eventually. Let me know what your opinions and thoughts are. Thanks