Super Jet Pre Daytona Rebuild

[Proformance1]

Well I wanted to wait till after Daytona to rebuild my 05 motor, but it wasn't in the cards. I knew last year it was getting weaker, and by Wavedaze I had my fingers crossed. A few more rides, and it was rattling so bad Drew Productions could hear my motor while riding. LOL Figured I'd better do it before the real damags starts, so I pulled it down after the last ride. I was rattling so bad the exhaust was wearing a hole in the side of the ski. Pat said the crank was .0055 out so that may have been part of it.



Thaks to Pat, (Moto360) for hooking me up rebuilding my OEM crank to better than OEM specs. He used Koyo bearings, and new rods. These are some disassembly picts.

I picked up the crank from Pat last night and just got out of the garage from firing her up. I had everything pre cleaned and ready to go, so it wasnt too bad. I switched back to the 38's and a stock flywheel for now. The other parts are for my next project coming next week. Other than the shims, it went pretty well. Hopefully tomorrow i'll go for a water test.

 

[Proformance1]

Water test went pretty well, I have my FP cooling line strung up the handle pole for my hand warmers. It was running about the correct temp, considering the water is in the 40's now. My 4mm restricted line coming out of the top of the head was running way too cool, so I restricted it to 2mm, and the motor still would not get that warm. Maybe 80-90 deg max. I'm running single cooling to the bottom of the FP manifold currently, out of the otp of the head to the overboard, via restrictor mentioned earlier, the other one out of the head goes into FP. Then out of FP non restricted. Motor is 190 psi now with the fresh rings.
Should I restrict the water coming out of the FP also, for this cold weather riding, or what?

 

[Tyler Zane]

just brain storming.... i would imagine more watter is going out the pipe than the 2 mm restrictor out the head. im thinking maybe a 2mm restrictor before the pipe as well, that way you are keeping the water flow equal... ?

im curious to see who chimes in and what they have to say.

 

[Proformance1]

Just sent Art an email on it. I dont want to cold sieze it trying to break it in.

 

[ADDict]

Restricting before the headpipe has been discussed 1,000 times and affects the performance of your headpipe. The headpipe works like intended when you you have full pump pressure from the rear and restriction on the pisser, building pressure in your headpipe and spraying the water through the injection holes. Restricting before hand would mess up your water flow.
So your running one single line in from the pump to the fp mani, and running two off the head, one overboard(restricted) and one to the headpipe? IMO, your dumping too much water. If thats the setup, I would T your two head nipples together and run T'd line to your headpipe. Insert your pisser between the headpipe exit nipple and the stinger. That way your flowing one line in, one line out. With one in, two out, your water will always pick the path of least resistance, and just bypassing your restriction.
All just my .02.. I could be way off base.

 

[Matt_E]

Water test went pretty well, I have my FP cooling line strung up the handle pole for my hand warmers. It was running about the correct temp, considering the water is in the 40's now. My 4mm restricted line coming out of the top of the head was running way too cool, so I restricted it to 2mm, and the motor still would not get that warm. Maybe 80-90 deg max. I'm running single cooling to the bottom of the FP manifold currently, out of the otp of the head to the overboard, via restrictor mentioned earlier, the other one out of the head goes into FP. Then out of FP non restricted. Motor is 190 psi now with the fresh rings.
Should I restrict the water coming out of the FP also, for this cold weather riding, or what?

I have a cooling setup almost identical to yours, and our water temps ate pretty close, too. I don't restrict the water coming into or out of the head pipe. You want full pressure. The colder water affects pipe tuning a bit - take care of that with the screws if you must. I never mess with it, and don't really see a performance difference between winter and summer.
I run dual outlets from the head, both restricted to 2mm in water below 45. It gets the motor warm enough.

 

[Proformance1]

Matt, I think Art is going to be in line with what you are saying. Def restrict after FP, he has already said that much. I'm not looking for any more perfofmance, just trying to keep those cylinders warm enough. So you are running your one head water line to your FP also?

 

[Matt_E]

Eh, no.
I have two water lines coming from the pump.
One feeds the motor, the other feeds the pipe. Two outlets on the head (restricted), one going to a pisser, the other going up the pole to my bars.
The head pipe outlet goes to a tee. Straight end of the tee to a pisser, the other end to a restrictor, then a flow control valve, then the pipe stinger. That water box is pretty dry, lol.

 

[Proformance1]

Talked to Art. He said for Freestyle, with no long full throttle blasts, "The risk of cold seizure is more when the exit water is closer to around 60 or 70 degrees. Under load this lower temp causes the sleeves to actually get smaller as you are starting to develop more power while at the same time you are flowing more and more water AND the piston is growing because of the extra heat due to the extra load. This normally does not take place under 5 or 6 seconds"
I'm going to put my digital temp gauge on it next ride and see, but if anything, I will restrict after the FP. Right now its going up my pole to the hand warmers. So I hate to restrict, but the motor is more important than my hands being toasty.

 

[Matt_E]

Your hands will be warmer WITH the restriction.

 

[Proformance1]

Good point, guess I'll just have to move them closer. I was thinking about the reduced spray

 

[Matt_E]

I've done it both ways. Personally, I prefer less water that's hotter. Also gives less chance of freezing up the throttle cable.

 

[Proformance1]

Good points.

Changed my bottom turf out while it was down, added 25mm Hydro Turf under pad. Wow is that nice to ride on. I had to sand a bit under the footholds but it's so nice and cushy now. Even my front foothold is nicer now. I just have a few more things to clean up bofore the trip down. Tighten the steering up again, for the 20th time, etc