Sx-r 260

A

Austin_landers

Location
Wichita ks
Building the sx-r that Kawasaki should have.

Picked up this donor ski off market place that had a broken piston. 2008 Kawsaki 250x , supercharged 250hp 1500cc.
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Was able to find a 2018 sxr hull with some minor damage to the bottom about 6hrs south east of me . Met the seller at a lake and tested out my new revolver build. 58degree air 48 degree water temp made for a quick water test . But was good to get a first shake down ride in on a new build.
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Got then engine pulled out of the donor.
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Got a set of ultra 260 forged wossner pistons and a new oem cylinder. 250 and 260 have the same engine , 260 just received updated pistons with more compression to make the 10 hp and fix the 250 broken piston problems.
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Found a used blowsion pole and steering setup, then a local friend posted his ultimate hood setup for sale . Traded the blowsion pole and some cash for the hood setup. Rode his stock 1500 with this hood and it was a blast on a buoy course.
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Got the engine test fit so I could see where I’m going to mount an Intercooler as the oem is way to big. I’m going to have to build own exhaust outlet.
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Test fit the supercharger on the engine , supercharger just barely fits fit he side of the hull.
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A

Austin_landers

Location
Wichita ks
Got exhaust from manifold to hull outlet built . Planning to put my intercooler where the oem waterbox was . Hopefully not too loud being straight piped.
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Made an adapter to use the ultra fuel pump assembly into the sxr tank . Eventually I will make a larger fuel tank . Ultra oem tank was 22 gallons , sxr only 6.1. Fuel consumption claimed to be 22 gal/hr at wfo. Was able to modify the fuel sender so I will have a fuel gauge with the cluster.
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M

Mentzel

Location
Ak
Interesting build,, you may want to check weight and balance. The SC is heavy and it may lean way too much in a ski. Even the heavy ultra hull will list to the SC side when floating. May need to add weight to balance it out. Good luck on build.
 
A

Austin_landers

Location
Wichita ks
Mentzel said:
Interesting build,, you may want to check weight and balance. The SC is heavy and it may lean way too much in a ski. Even the heavy ultra hull will list to the SC side when floating. May need to add weight to balance it out. Good luck on build.
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I’ll for sure will be mounting the battery and such on the other side . I know I’ve ridden some skis that set low on one side and didn’t notice once moving.
 
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A

Austin_landers

Location
Wichita ks
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Progress has been slow , pulled the cylinder off and found a spun rod bearing . Found a crank / cases on eBay with 37hrs on them . Decided I wanted it to be 100% fresh since I was this far . Been waiting 2 months on backordered rod bearings and oil pump . Shows they have shipped so goal is have it running by Labor Day. Definitely would of been money ahead to buy a better running donor or a newer 300/310.
 
M

Mentzel

Location
Ak
Dump that engine if you can. They were not great to begin with. There were lots of changes for the 300/310 engine to improve reliability. The 300 supercharger is much larger and heavier though so this would be a big challenge for a standup hull build.

Also do not put that back together without disassembling the oil cooler. Especially if it had ANY salt water use! The small channels in the oil / water heat exchanger get corroded up and cause problems inside. Further the Kawi castings are not great. Look close at all pieces (even new ones) before re-assembly.
 
A

Austin_landers

Location
Wichita ks
Mentzel said:
Dump that engine if you can. They were not great to begin with. There were lots of changes for the 300/310 engine to improve reliability. The 300 supercharger is much larger and heavier though so this would be a big challenge for a standup hull build.

Also do not put that back together without disassembling the oil cooler. Especially if it had ANY salt water use! The small channels in the oil / water heat exchanger get corroded up and cause problems inside. Further the Kawi castings are not great. Look close at all pieces (even new ones) before re-assembly.
Click to expand...
The 300 charger actually sits tighter to the engine and I have one that I’m thinking of using . Fresh water ski but it’s getting fully rebuilt. I’m hoping with the forged piston setup , new 250 or 300 charger, new oil pump and engine freshened up it should last awhile . I am already searching copart for a 300 . I heard the 310s had piston issues as well.
 
M

Mentzel

Location
Ak
Back in 04-05 ish, Riva had a vortec supercharger kit for the 15F. It was much smaller than the newer kawasaki SCs.

Might be worth a search as it would likely be easier to install due to size. I do remember those being problematic for the race skis blowing belts though. But they were fast for the time.
 
A

Austin_landers

Location
Wichita ks
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Finally got time to get engine built over the 4th of July .
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Installed Amazon boat fuel tank level sender in oem tank and then gauge in factory key spot . Mounted the key on the right side.

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All stuffed in there . Very little room to work with 4” air inlet piping , 2.5” exhaust , and two 2.5” intercooler pipes .
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Got the engine harness and wiring installed , hood on and test rode it Sunday . Sounds incredible. List of small things left to do .

Steeper impeller 18/28 or so
Mount ecu
Mount gauge cluster to hood/ steering
Wire in fuel sender
Add more cooling to the exhaust
Replace some charge pipe clamps to t-Bolts
Possibly add a 3rd 1/2” cooling line
 
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