Thread: THAR SHE BLOWS!!! (piston)
06-22-2009, 01:58 PM #1
THAR SHE BLOWS!!! (piston)
Well, I finally managed to join the all-inclusive Fuji blues club.
Thing is, 3 weeks ago I had her out at the lake and the ski ran great. But I had all this junk in my fuel lines and tank. So I took the tank out and cleaned it, replaced all fuel lines, checked the carb screens.
I did pull apart 1 carb to check, it was clean. This was the one I had trouble getting the diaphram back in. Could that be? The only other thing was I had to make my own carb base gaskets. The old ones had that white stuff motor builders use (#'s?) for good seal, and it wrecked 1 of them, so I made 3 new ones.
06-22-2009, 02:10 PM #2
So, me and my son drove to the Sac. Delta area for the '09 freedom ride. Took 'er out, and could only get 45-4700 rpm. A coupla times after idle, it would run up to 62-6300, and go right back down.
Seemed to be starving for fuel.
So took her in, put on trlr, and went thru everything again. Re-set carbs to factory, plus 1/4 turn. Put it back in the am, for the ride. Got right up on plane at 6200 for 10 sec. and died.
Bummer to as I was the only Polaris Pilot present. Pirate didn't show 'til the afternoon. He had said Al was coming, so I was going to ask the what they thought. I know Al would have found whatever it was. I just don't have the experience or the knowledge.
So my son took the Kaw 1200 on the 90 mile ride, and when he got back, I did get to go on a 40 mile mostly wot run on the Kaw with 17 other ski's along. Fun!
1. How do I ensure the bottom end doesn't have cosmic piston dust in it?
2. Best source for piston and rings?
3. If only breaking in 1 cylinder, do I use pre-mix, etc.
4. The jug seems in good shape, but needs a hone.
Was trying to represent with my fine metro-sexy color and design Polaris ski, but I did get to meet some great people and take a great ride thru some interesting waterways.
06-22-2009, 02:29 PM #3
Robert and I were talking your troubles yesterday. I notice from the pic that the head gasket is upside down Bro. Take a look at the other pistonies, and see if they were running lean too. If they are ok, you may have an air leak. Rear seal, base gasket perhaps.
06-22-2009, 02:34 PM #4
If they are all lean, I'd suspect the tank venting. Perhaps the intake check/vent stuck closed? Or the fuel cock restricting, or leaking/ sucking air?
06-22-2009, 02:45 PM #5
- Join Date
- Jul 2007
- near Toronto, Canada
06-22-2009, 02:50 PM #6
I checked the fuel valve, it is okay. I dont think tank venting has anything to do with it because it is the same set up it was. The tank on a 94 doesn't pressurize. I will upgrade to the 95 set up as soon as I find a check valve that has 1/4 barb on both sides so I can vent to the pisser port by the bars, and will use an in vent from a t on the out vent.
Would the bad carb diaphram do it?
How hard is the rear seal to deal with?
Any sugs. on my previous questions?
Man, what a bummer. Was really looking forward to that ride.
06-22-2009, 02:50 PM #7
Thx XLint. Duration?
06-22-2009, 02:53 PM #8
Eric, upside down as in holes are in right place, just upside down or...?
06-22-2009, 03:08 PM #9
- Join Date
- Jul 2007
- near Toronto, Canada
06-22-2009, 03:19 PM #10
The vent on my ski looks like a Kawasaki pisser thing up by the bars. It has a two way check valve. It allows air in or out and has a thing on it for turn - over, so no gas gets to the engine comp.
It has never pressured up. I also need a new fuel cap gasket, the one from the supply lines. (blue) The old one was shot. I put a cork one in for just the weekend from a John Deere tractor fuel seperator. Fit great and sealed, but its cork. Figured I could get away with it for the weekend. Should I make one out of innertube? No one has rubber gasket material any more.
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