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Strong water pressure through a hose will find the leak right away. A pin hole leak in a head gasket won't show up on a compression tester but will throw just enough water in the cylinder to make it hard to start. Be careful I had a buddy who ran a ski with a bad head gasket on the hose and...

If it's hard to start it's most likely a bad gasket and water is getting into the engine somehow. Out of the water run without hose shut it down and try to restart it. If it starts fine put it on the hose and run it and look for leaks. Kill the motor then try to restart it right away. If it...

This is a great thread. http://pwctoday.com/f72/turn-your-stock-slow-37mph-650sx-into-respectable-47mph-ski-around-200-a-157734-4.html Group K does great work. For the 650 motor a 44 or 46 sbn Mikuni & The pipe mod really wakes them up. The porting isn't as conservative as a 650 yamaha is...

Make sure you pull the drive shaft off the coupler running it without the pump. I've made that mistake before...

blown pump bearings right? My buddy didn't catch it in his 550sx just chalked it up to being old. The entire pump was trashed. The impeller and wear ring ate one another and the loose bearings blew out the back of the stator section. It also took out the mid shaft carrier.

I beat the nicked/bent edges on the anvil part of a vise with a flat hammer before I file them down. If your skilled in Neanderthal repairs you won't have much filing to do.

Making your turn angle tighter makes the wake bigger, steeper, faster and harder to get into. Once you figure that out you can tailor your wake to what you want to do. So for a stab I make the wake a little less than 90deg. For getting more height or getting the ski vertical I will make a 135...

Pop you gas cap off before you turn your fuel on.

Were they WSM or Mikuni? What gas did you run? It could just be something stuck in them. Blow in your fuel pickup line till all the fuel is purged out. THen pinch off the return and blow in. If you can blow air into it a needle & seat is open or bad. If you have a pop off tester or pump use that...

Bad n&s

I had a 61x @ 83mm that had the exhaust ports raised a bit more than a 62t cylinder and it pulled a 12/17 cutback skat swirl & stock nozzle to the rev limiter on glass without a problem. I Had a protec race limited cast head on it and it was only putting out 135-140psi with a fairly tight squish...

Where on the motor Is it injected?

Bike break levers work.

One of the best parts about this site is that it is if there is a hobby that I'm not really that into and I need advice, there is almost always someone on here that knows their stuff. I usually have better luck searching this site for advice on unrelated hobbies than I do a search engine. The...

My buddy has an old race 750 from the bud tour days. It has no flame arrestors on it and he had this happen. He fixed it and continues to run the ski with no flame arrestors! It still ran like a champ He only noticed cus he replaced the motor mounts. This looks like job for JB WELD!

It will def work. My buddy has barefooted behind a bone stock 650 sj. He also slalomed from a deep water start behind a 750sx. The 750 got him out of the water sooner than you average couch could. The slalom ski was more work for the guy on the Kawaski than the guy on the Connelly.

The engine Sound will change completely. Also the smell of unburnt fuel gives it away too. Cut back your plug wires and replace your plugs & boots. Make sure you use dielectric grease on the boots. If salt water gets on the plug insulators they can arc from the wires right to the head. Silicone...

The new sj rides on top of the chop. So long as you keep your speed up. Bog it down in a corner carving too hard and it can be tricky to get the nose down and hold a good line especially when it's low on fuel.

The sj's are way lighter and more nimble than the sxr. When I go from my new sj to an sxr it feels like a tank. The sxr just isn't near as much fun as an sj. It all depends on what you want to do with it too.

Are you running water injection? Was the ski running correctly before with this setup? What was changed that made it run poorly?