Just bought a 1990 js440. Is there anything I need to know about this thing before I get it ready to go? This is my first ski and I'm super pumped to get it in the water. The only thing is the whole pump housing including the prop has been taking out of it and I have all the pieces so I think. Is this a expensive rebuild? Is there anyplace to find parts? I'd like to go back with stock or OEM parts if all possible.
1990 JS440
- Thread starter txlineman
- Start date
It's a 2 stroke so mix TCW-3 oil with your gas.
Start searching pump diagrams for ideas on how to reassemble.
Probably has bad pump bearings which is why it was pulled apart in the first place
check yamahapartsnation.com for diagrams and parts
Start searching pump diagrams for ideas on how to reassemble.
Probably has bad pump bearings which is why it was pulled apart in the first place
check yamahapartsnation.com for diagrams and parts
- Location
- Jasper IN
That's a Kawasaki ski and the 440 pump has no bearings rather it has a bushing and a seal. Get a clymer manual to learn about the ski as well as the pump. Installing it is straight forward but you will possibly need some shims to do it.
- Location
- Jasper IN
The lines are supposed to be:
Supply to fuel switch main
Supply to fuel switch reserve
Return from carburetor
Vent with back check.
Hard to tell which line the filter is on but it should be on the line from the fuel switch to the carb. A stock ski has a fuel filter water trap type of unit mounted to the side of the hull. If you have no selector switch then the filter should connect the longest fuel pickup tube to the carb.
And yes you need a filter for sure. I run the stock one on a couple of my skis and aftermarket ones on others.
Supply to fuel switch main
Supply to fuel switch reserve
Return from carburetor
Vent with back check.
Hard to tell which line the filter is on but it should be on the line from the fuel switch to the carb. A stock ski has a fuel filter water trap type of unit mounted to the side of the hull. If you have no selector switch then the filter should connect the longest fuel pickup tube to the carb.
And yes you need a filter for sure. I run the stock one on a couple of my skis and aftermarket ones on others.
- Location
- Jasper IN
- Location
- Jasper IN
The line that goes up the pole is your vent line and that lets air back into the gas tank as the carburetor pulls it out. It should have a check valve in it that allows a little bit of pressure to build in the gas tank. A filter would only filter the incoming air to the tank, not necessary.
- Location
- Jasper IN
- Location
- Jasper IN
1/4" fuel line is fine although the nipple diameter is a little less than 1/4. I have been using 6mm OEM style on my more recent builds since its more flexible and seems to last longer.
Auto parts store will have line that will work and get you on the water.
Auto parts store will have line that will work and get you on the water.
- Location
- Jasper IN
Look inside the steering nozzle and the exit nozzle, the cone looking thing pointing at you has a zerk.
Inside the hull where the drive line exits the "firewall" there is a bearing box that holds the drive line, there is a zerk there as well.
There are likely opinions as to what sort of grease is best but for rec riding I just use marine wheel bearing grease like I grease my trailer spindles with.
Inside the hull where the drive line exits the "firewall" there is a bearing box that holds the drive line, there is a zerk there as well.
There are likely opinions as to what sort of grease is best but for rec riding I just use marine wheel bearing grease like I grease my trailer spindles with.