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  1. Replies
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    Re: 650sx with 750, WTB Parts, info

    I trust Bill's info on these carbs. As I mentioned, I haven't done the drilling mod but have a second set devoted to this. But I haven't needed to go that route yet. We have settings which are...
  2. Thread: 750 temp

    by theVetteman3
    Replies
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    226

    Re: 750 temp

    For just normal riding, not being able to hold your hand on the cylinder for a second or two seems very hot. Most of my dual cooling skis I can hold my hand on the cylinder for at least 10-15 sec,...
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    Re: 650sx with 750, WTB Parts, info

    I highly recommend using a better pipe. The 650 pipe is ok at best on a 750 single carb. On a dual, no way. It'll choke the power down and give you weird jetting and impeller settings. I recommend...
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    Re: VForce3 kawi 750

    What carbs are you using?

    Before reeds I would upgrade your pipe. In this application anything from Westcoast is on the bottom end of the performance range of what's possible. I recommend the PJS...
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    Re: VForce3 kawi 750

    My brother and I have used them on 800s, not 750s. Both are ported engines, and both have advent. They are good mods to do once everything else is modified and set up well. Such as cylinder porting,...
  6. Re: BJP Prize Ski Build Thread - 650 Jammer - Jet Blast 2019

    Yea I looked back at this thread and I saw the 16/19. Although I was skeptical at first with my friend's build, the 16/19 works very well with the stock pipe. For the price difference you had that's...
  7. Re: BJP Prize Ski Build Thread - 650 Jammer - Jet Blast 2019

    Very nice! Did you end up going with a 17/20 Skat LX impeller? That speed is right where mine was with that configuration, I believe I did 40.4.

    Our second 650 swapped jammer was just completed...
  8. Re: BJP Prize Ski Build Thread - 650 Jammer - Jet Blast 2019

    The WJ in my mind was actually better than the WB1 in so many ways. First off, it's the size of an actual ski, not a sit down.

    With the extra power, if you really work at it, you can rail turns....
  9. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    True but that's mostly because there is more support for the Mikunis. From tuners, engine builders, and just regular dudes. From certain aspects this is definitely because they are designed better...
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    Re: New to jet skis

    Yes welcome!

    The oil tank has been removed as well. It fit in the rectangular cut out on the top left portion of the gas tank.
  11. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Ahhhhhh, I forgot you made that modification. I can't help you there, I would ask Bill for info. Based on what Bill said previously I would suspect it has more to do with the mid jet than low jet.
    ...
  12. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    It is a coincidence that the single uses a 75. Completely different application. Unless you meant you just have to order one more.

    Get the settings like I mentioned, don't worry about pop off. See...
  13. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    So you're at 78 55 135 now. I would suspect that is way rich from what I have seen. I would not drop that much on the pilot. If you haven't tried 78 50 132 it's probably a good idea to do so. You...
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    179

    Re: WTB Yamaha WR / WJ 500 driveshaft

    PM replied.
  15. Replies
    2
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    179

    WTB Yamaha WR / WJ 500 driveshaft

    I'm looking for a Yamaha Waverunner / Wavejammer 500 driveshaft for cheap. I am going to cut the end off and turn it into a midshaft tool.

    Not looking for a full pump, but I might entertain one...
  16. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Lol nice! It's all about figuring it out the issue, and you've made good progress.

    Like I said, I would expect you to be rich now. See how it goes, ideally get a tach or gps and see where you're...
  17. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Chris I get my Keihin jets from Atlantic Jet Sports. But yea a few places have them. The actual Keihin rebuild kits come with springs. Beyond that, I have never had to change a needle and seat yet. ...
  18. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Ahh as I understood from what Bill quoted, we were talking a single 44-46 sbn vs dual 40 3 jet Keihins. Yes I understand Mikunis are a better carb. But if I was on the line for a race, I'd rather...
  19. Replies
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    233

    Re: 550/750 pump install help

    Yep just take your time. I would say I spent maybe 20 hours getting it set up right, at most. And that was doing everything perfectly. Cutting the pump by hand based on the template, ect.. Most of...
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    Re: Kawasaki Small Pin top end Rebuild

    Agreed. Stay away from SBT.

    Chris Newmiller (mcn6 on here) is an excellent choice for us form members here. He's located out of Oregon but offers good prices and always gives you tons of data....
  21. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Chris I actually don't disagree with what Bill said. But, you have to significantly change the jetting on the 3 jet Keihins and know what you're doing to address the weaknesses which they have stock....
  22. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    The only areas you'd see improvements with a single would be fuel economy and ease of tuning. Power and torque will be significantly down. Sometimes fuel economy matters. Not only that, but because...
  23. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Interesting. I have not tried drilling out the lower transfer holes as Bill indicated, although I do have a second set of carbs entirely devoted to this. Just on the back burner for now, as this...
  24. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Interesting. Are you still on 32:1?

    If they look symmetric and fit both ways I wouldn't worry about the direction. I can't remember off the top of my head. Also this is one of those mods that...
  25. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    I would get to your final ratio, 40:1, and see how things go. Less oil it will be richer.

    Based on all the skis we've done at that point I would consider your jetting to still be rich. The 135...
  26. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Wow very nice!! Glad all that work paid off!

    Yea get that 32:1 done and see how things are. The bit of bog could be from the 135 main jet. When you feel the need it might be worth swapping to a...
  27. Replies
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    Re: 550/750 conversion cavitation

    Need to know a bit more about your set up too. I was running a 10/16 with a 750 dual carb engine. Limited, no porting. 80mm nozzle, PJS pipe, Supertrap waterbox, stock ignition. 10/16 was perfect...
  28. Re: Kommander Domes for SXR 800 head - 29cc

    bump.. still looking guys
  29. Replies
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    Re: How to get more torque

    Thank you Bill! That is some good info there. I'll definitely experiment with this.
  30. Replies
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    Re: How to get more torque

    For more low end torque, also consider changing pipes. The 650 factory pipe is a good all around pipe, but my friend has a dual small pin with a waveblaster factory pipe and there is definitely more...
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    Re: How to get more torque

    He is alive!

    Bill, do you have any guidelines on jet selection for reverse jetting the Mikunis? I'm curious how it compares to factory pipe's jetting. Which so far on a variety of flame arrestor /...
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    Re: 650sx resto-cavitation

    Wow really weird that the wedge stopped it. Did you ever check the pump silicone? You shouldn't need the wedge stock. This might be masking the true problem, but if it works go with it.

    I was...
  33. Re: Unusual Condition Found On 650 Crankshaft

    Echoing what BL and JHR said, it looks like fretting from the surfaces moving relative to each other. The material transfer is the give away with this. This happens when you have relative motion of...
  34. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    This is a good point. If I didn't mention it, I should have. My settings apply only to the 3 jet 40mm Keihin CDK2s which came on the 94 ss xi and xir small pin dual carb 750. Maybe some 95 ss xi skis...
  35. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Wow crazy. That sounds like an air leak. Any time an engine is doing something you didn't pull the throttle for, suspect an air leak. I had a 750 that was vaguely similar and it had a massive crack...
  36. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Meant singles here.. obviously. Lol.
  37. Replies
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    Re: Carbon pipe build

    Wow interesting. I encountered the same thing going from the side draft xir pipe to the nynja in my pro, when my ported 800 race engine briefly swapped hulls. My xir side draft jetting was way too...
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    Re: Carbon pipe build

    Nice Mike. I know exactly what you mean. Keep up the good work, interested to see this ski at some point this season!
  39. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Duals are great if you want fuel economy or don't like copying one carb setting to another. There are no other positives. I only run a 44 sbn on my wavejammer so it's small tank can last a while, but...
  40. Replies
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    Re: 550/750 pump prop size

    I was running a 11/17 hooker with a 76mm nozzle on my ported 550/800. It was still under pitched, I actually gained low end from going from a 80mm to 76mm nozzle.

    I'm not sure if I know enough to...
  41. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    So a few questions.

    How old are the crank seals, and are you sure the bottom end is air tight from a leakdown test? Literally you can't do anything else until you are positive that's the case.
    ...
  42. Replies
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    Re: 750 ssxi carb tuning

    I have used these carbs on a lot of 750 conversions. These should be the 40mm 3 jet type, with the jets 72 45 135. All three should be on the same side (later Keihins were different and I can't speak...
  43. Re: Kommander Domes for SXR 800 head - 29cc

    Sending a PM now. I dont believe at $60 each it will be cost effective to purchase them from you unfortunately. Shipping will probably be at least $30-40 usd which is right at the cost of new domes...
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    Re: Carbon pipe build

    Awesome Mike. There are maybe 3 people ever from this forum who have designed pipes which have been actual improvements over existing ones. Most you can tell by looking at them are just horribly...
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    Re: 98 SXI Pro Carb Kit

    If they are the 3 jet Keihin 40mm type, such as off the ss xi and xir, they can be tuned right. I actually prefer them to the 2 jet ones off the sxi. The third jet is a mid range which is useful to...
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