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  1. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Yeah it seems to be good, i actually could probably go to a 80 low i had my low screw at 1 out and it had a mild hesitation so it's now at 1 1/4 and it's a tad rich idling in no wake but throttle is...
  2. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Well copied the 78/50/132 @ 28psi pop off and 1.6 needle seat and this is definitely the setup for these carbs, ran great the other day, will be doing plug readings the next time it's nice out!...
  3. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Well since i had a lean condition on my 72 low Jets i drilled them out to a 74 and some odd cents and there is no more bog and no hesitation, it just picks up and goes haven't changed the high jet at...
  4. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    So I'm looking at ordering everything, on jetsrus they list two different springs a 70gr and 40gr which one is which?
  5. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    So my next question would be how would that setup work with the transfer port modification Bill recommended, would it need to be smaller on the low jet because of the increased pull through the...
  6. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Well i still had the bog yesterday, i swapped the pilot back to a 72, i also have a 75 i can put in there, hopefully now that i have air leaks fixed it will be fine..... I know my oem single 38 has a...
  7. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Well I'm gonna try to water test again tonight, i have two sets of pop off springs, found my Gage is about 5psi high, when i was in the carbs last i set the psi to 25 but really it was more around...
  8. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Apparently the pop off have i used is 5psi off so i was running like 18 psi so now i have corrected that, i will see what happens tomorrow after work
  9. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    All right I will probably get it back on the water tomorrow so I will report back then
  10. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    So i ended up with 5/8 turn out on the high screws and 1 5/8 on bottoms, it seems a bit rich... But when i go to give it throttle there is a bog i tried leaning the low end and it got worse, it...
  11. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Yeah it might be a tad rich, i guess we shall see, but it fired up great cold with a couple primer pumps then without the primer after it's warm it fires up easily so i must be close on the low side,...
  12. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Well I'm not sure what year mine came from, but they came with a small pin manifold so I'm guessing they are the"good" years you are talking about, now i just need the weather to cooperate so i can...
  13. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Well can't say for sure until i water test..... But i think i figured out the issue..... I almost don't want to admit my mistake lol, but i got to looking at a diagram of these cdk2 and realized i...
  14. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    So don't change the pop off but instead increase the Jets? Like i said before I'm at 135 main 55 mid and 78 low and 1.75 low screw and 1.5 high screw
  15. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    So I'm reading that one of the other fellas on this post recommended using 40g springs to bring the pop off around 15-17 psi what are the thoughts of this? Could it be reasons why my high and low...
  16. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Well I'm going to change the fuel filter, i installed the r&d stuffers and new gaskets, i took my Dremel and evenly matched the intake to the stuffers the best i could, mostly just rounded out so it...
  17. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Yes they are connected to the oem fuel selector, i think I'm going to replace the fuel filter as it has a small Stone type filter that I've never messed with, previous owner installed it, the fuel...
  18. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    So would going to a single sbn44 yeild any benefit over the dual 40s?
  19. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Ok I'll just use my best judgement on them, still not sure why my fuel screws need to be so far out since I'm running richer Jets then you have, but it seems to run great where i have it at so I'll...
  20. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    I tried backing the fuel screws back in a tad and it got hesitant, so as it sits im at 1.75 low and 1.5 high and it likes it there....
  21. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Also which way do i install the r&d reed stuffers549013
  22. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Will do, I've been doing some tinkering with the pole spring tension and ride plate shimming so I'm itching to test it out and see if i need a different plate or not, will probably have the next tank...
  23. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Yes i have a R&D snail pipe on it, boysen dual stage reeds, vortex flame arrestors, timing advance, oe cdi, the d stamp head with 27cc domes on a no stamp small pin cylinder bored over 2mm, have carb...
  24. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    I can't exactly remember what i have the pop off set at but i want to say it is between 23 and 25 each carb and the "float" tab is at 1mm with a 1.6 needle seat combo
  25. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    I almost feel as if i could go up on the low jet, but i will hold off on that until my fuel ratio is where I'll be running it and for warmer Waters, also i just bought some r&d reed stuffers, will...
  26. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    My impeller is the oem sxi which i believe to be 9/17 stainless, and it's a 93 750sx hull, i was out yesterday and have the high side screw at 1.25 out, and low side at 1.75 and it ran great, hard to...
  27. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Well i little update i fully rebuilt the engine 2mm overbore, reused the crank, put in new seals, put 1/8" npt plugs with case sealer on them in the crank case drain holes, did the transfer port mod...
  28. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    The Pistons look good to me besides the scuff on the one, i flat sanded the dual carb base, and manifold, also disassembled and flat sanded the carb body where the oring seals the two, haven't tried...
  29. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Well i tested compression with 3 testers mine is 30psi low but the other two were the same, the engine almost seems to fire with the kill switch off, I'm dropping the core cylinders to be bored of at...
  30. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    So are there issues with air leaks at the throttle plates? On these 40s? I'm not sure what to call it, but rod that goes side to side that holds them? Do they get worn out?
  31. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    I think what i might be experiencing is pre ignition I've been using 91 octane non oxy fuel.... I put things together just to test compression and it was at 185psi and just like diesel fuel, gas will...
  32. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Well currently I'm doing a rebuild due to the sleeve cracking on port Bridges, then somehow loosening up in the jug and then dropping down, waiting on a new cylinder to arrive then get bored and...
  33. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    If i install my oem single keihin carb ski runs great, but isn't quite as peppy like it is with the duals lol
  34. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Crank seals are good, and it's hesitation, just totally cuts out, mid, send to idle and run full throttle great, it will idle all day at low screw set at 1 turn out but when throttle is applied would...
  35. Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Hello this is a old thread i know, but instead of starting another I'm curious about the 40mm 3 jet, i have a small pin bored over 2mm with about 175psi compression and vortex F/A, timing advance,...
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