650/X-2 650sx newbe in nz

[kiwimidi]

Last week i picked up a 650sx. Was running with a slug of gas down the carb but that was about it. The inside of the hull covered In brown oily dried salt water (boat has no drain bung is this normal?).

First job I pulled the motor out and cleaned the hull up a bit. Found Its got a westcoast pipe on it. Also found it was missing a hose clamp on water box so glad I didn't put it in the water, had a broken engine mount and snapped a bolt of between exhaust manifold and pipe.

Right now she is all back together and I had first test in the water but it didn't seem to be cooling like it does on the hose the pisser was hardly dribbling. I have blown air back through all hoses and checked for blockages and all seems good. I had the ski nosed in to the wharf while testing it so wondering if cavitation was stopping the pressure in the pump therefor no cooling water?

Btw cool forum I'm looking forward to learning heaps.


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[stagesrt4]

make sure your not mixing up the cooling lines coming from the pump.... have to make sure they are correct of motor will have trouble picking up water

looks like ski has a few mods to get you started...(pipe, manifold, oil block off)... rear exhaust outlet is nice too


pick up a crank case block off plate while you have motor out.

I have tons of motor mounts if you still need any

 

[samsmith87]

The cooling jacket on the West Coast Pipe is probably corroded, make sure it flows will through there. Check all 90 brass fittings for things jammed in them.

 

[kiwimidi]

Is the rear exhaust not standard? I did see a repair in the hull on the port side just thought it had had some damage.

I removed and blocked off the oil pump. I just don't trust them. I was wondering if I should have blocked the crank case drain It doesn't seem to "pop" when I open it.

The ski was running like crap but I found the idle adjust screw was broke off and it the butterfly was completely closed. Does any one know what the standard jet settings on the carb are its a keihin 38mm I think they where set at about 3/4 on the low and 2/3 high.






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[kiwimidi]

First actual test run. Remember I am a complete novice and have never ridden a stand up before. I warmed it up at the ramp ( still not really pumping water). Pointed it out and gassed it, dragging along behind seemed all good, so got knees up once again seemed pretty stable so stood up and carried on for a bit then fell off.

What awesome fun!! Looking forward to my next outing.

Now the issues:

Cavitation. Its cavitating heaps seemed to get worse through the 5 mins I was in the water to a point where I had turn side to sied till it hooked up. On pulling it apart the impeller has had a really poor repair and is showing lots of cavitation wear.

there wasn't much silicone around the pump and it came off really easy. Would this cause the issues I'm having? The shaft bearing seems good and no water in the hull so I assume that's not what's causing it

Is the impeller beyond repair?

Is the cavitation lowering my cooling water pressure? I can't find any other reason for the lack of cooling.




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[Sospikey]

That impeller could really need a clean up. The cause of the cavitation is mostly the lack of silicone around the pump. Try getting the impeller cleaned up/replaced, read-up on how to properly seal the pump to the hull (this is VERY crucial) and let it dry properly before hitting the water again.

 

[Harbor]

Cooling issue

Here is my old 650 SX 1991 with stock rear exhaust. The stock exhaust I removed has small pisser and hose and water kinda trickled out sorta, water flows with about a 1 inch stream out the pisser once it starts flowing which take maybe 10 seconds after engine start up to begin flowing. Cooled fine like that for years but once in awhile the little pisser and hose would get restricted @ the pisser. I sold the ski to a friend and I added this kirker pipe for him, I drilled out the hole in the barbed fitting in the bottom of the manifold to let more water in, replaced the head fitting with one with slightly larger hole, bigger posse and larger water lines. The pisser out stream has more pressure now and a 8 to 10 inch stream. Here us a pic so you can see how it looked after wards

 

[kiwimidi]

Glued the pump back in on Saturday and took it out for a test Sunday night. Cavitation problem sorted hooks up well now.

Still not putting much water out the pisser but I ran it on and off for about half an hour and only got hot not on fire!!

What's the go when u let go of these? it has no lanyard I know it's supposed to turn to the left and come back but how there is no spring in the steering like my old 750zi (which also had a tether). I have been hanging on pretty tight every time I fall off cause I don't want wave good buy and have a long swim back.




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[stagesrt4]

either get lanyard, install spring, OR turn idle way down so it dies when your not keeping it in throttle

 

[eastcoastjumper]

With it running against a wall have a friend put his hands over the rear steer nozzle blocking off the water while you control the throttle giving it gas and letting off. Its a little tricky to do but this will increase pressure in the pump and lines and could help blow out what you have blocking the lines. at idle the pisser should be flowing a little and at slow cruising speed it should start coming out normal.The top elbow of the pipe should be somewhat cool/warm to the touch depending on water temp. The expansion chamber should be pretty warm, never burning hot. You should be able to touch the engine cylinders without getting instantly burned when its running.

 

[Harbor]

So on mine I wondered the same thing so I used one of those small, really small bungee cords and attached to steering turn plate and poll so it pulled steering plate to one side, rode like this for years, fall off and ski circles you, you then swim out near the path it's making and grab it as it goes by, I usually grab the top of the tray side walls. Later the bungee rotted away so I took it off but found the ski still did the same circle, so we run without a bungee now fir past two years no problems. One thing to keep in mind is when you fall off do not swim after the ski, you will be in the center and it will circle you, just swim out to the edge of the circle and wait for it to come by you and grab it.

 

[jri93]

its the (centrifugal?) force of the spinning engine that causes the jet ski to do a slow circle. im not sure if centrifugal is the appropriate term but i know it has to do with the force of the engines rotating mass.

 

[stagesrt4]

Centrifugal force


im not sure that this is what causes ski to circle around.

my X2 drives straight as an arrow once i fall off. Ive had a hell of a time trying to swim n catch up to it... usually i just never let go

 

[Harbor]

either get lanyard, install spring, OR turn idle way down so it dies when your not keeping it in throttle

These are good suggestions, with a lanyard if the throttle sticks wide open the ski won't potentially hurt someone. Crash or take itself a cross the lake unattended. Low idles good if you don't trust it circling, some people with ski that don't circle and chose to run no lanyard use the low idle so it stalls out when not aboard.

 

[stagesrt4]

little lawn dart action.... this runaway could be you ha

Ive also seen runaway motors keep going once lanyards pulled, so its not 100% fail safe

 

[High Speed Industries]

Glued the pump back in on Saturday and took it out for a test Sunday night. Cavitation problem sorted hooks up well now.

Still not putting much water out the pisser but I ran it on and off for about half an hour and only got hot not on fire!!

What's the go when u let go of these? it has no lanyard I know it's supposed to turn to the left and come back but how there is no spring in the steering like my old 750zi (which also had a tether). I have been hanging on pretty tight every time I fall off cause I don't want wave good buy and have a long swim back.




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What part of NZ are you in?
Have you checked out http://www.dalusionfwx.co.nz/ you should be able to find some people to ride with on that site.

 

[kiwimidi]

Thanks eastcoatjumper that's what I needed to know. It's defiantly running hotter than it should I would burn my self if i was to touch the exhaust elbow. Even the hose from the elbow to the stinger gets pretty hot and flexible.

I will look into it some more tomorrow. I will start removing some hoses and testing flow while it's in the water.


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[Harbor]

Thanks eastcoatjumper that's what I needed to know. It's defiantly running hotter than it should I would burn my self if i was to touch the exhaust elbow. Even the hose from the elbow to the stinger gets pretty hot and flexible.

I will look into it some more tomorrow. I will start removing some hoses and testing flow while it's in the water.


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the 650 in post 7 runs about like your describing, blue hose to stinger and pisser get pretty flexible and soft, water is hot to the touch but doesn't burn you, elbows hot, this happens when riding

 

[eastcoastjumper]

Thanks eastcoatjumper that's what I needed to know. It's defiantly running hotter than it should I would burn my self if i was to touch the exhaust elbow. Even the hose from the elbow to the stinger gets pretty hot and flexible.

I will look into it some more tomorrow. I will start removing some hoses and testing flow while it's in the water.
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The cylinders are water jacketed and so is the pipe. When a ski sits and the water jackets start to corrode from salt it could create a restriction. I have dual cooling into my exhaust manifold. I tapped my pump on the other side and ran it through the bulkhead on an unused line. Then ran it to my westcoast exhaust manifold so I have 2 lines going to the bottom. You can also tap the stock head above the rear cylinder and run an outlet to another pisser overboard. But i would definitely sort out your flow issue. There should be plenty of water coming out of that pisser at idle and above when riding. i blew through my pipe fittings with compressed air to make sure there was plenty of flow.

 

[kiwimidi]

I have just pulled all the pipes and blown compressed air through with no restriction. Putting my lips to the and blowing its free from the input to the manifold through. The only bit where there is any restriction to me blowing is the hard pipe running under the foot well. Although it's not blocked (can pass a length of rod through it) it does restrict the flow. The pipe had a internal diameter of 6mm.
Is this standard or has someone sleeved it inside?

I ran the ski for about an hour today after checking all the lines and it was pissing a bit more water but still not heaps. The head and elbow where still too hot to hold a hand on. I checked the plugs after a full speed run into the beach. It seems the aft cylinder is a bit hot