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Ivan's Jet Kit installed on my 750!

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  • Tokalosh
    started a topic Ivan's Jet Kit installed on my 750!

    Ivan's Jet Kit installed on my 750!

    I'm a very happy man, so is my KAT.

    I was running with a K&N filter and a Carbon Can Co slip on, until I order a jet kit from Ivan, as apposed to the Dynojet kit and K&N jet kit. After doing a lot of reading and asking a lot of questions I decided to take it to the Pros to install, so off to HM Racing I went.



    http://www.hmracing.co.uk/Default.as...&intLevel10ID=

    When the above setup was dyno'd I was getting 84.0bhp Max power at 11500rpm, and the fuel mixture was very, very rich.

    They then installed Ivan's jet kit to his specifications, so now it was set up with the stock filter and the needles where set on position #4.
    This set up was still not correct as the fuel mixture was still very rich. They then decided to change the Pilot jet's to 107 as apposed to using 110.
    They also changed the needle clip position to #3 then again to #2.

    The new set up was much better with the fuel mixture almost perfect and #2 clip position on the needle, with the stock air filter.

    When this was dynod I was getting 86.0bhp Max power at 11500rpm. I rode the bike home and could not get over how different it feels. It is so much more responsive and oh so smoooooooooooth, when idling the bike is quite and smooth, On the twisties the power is more responsive and there when you need it. All in all Im very happy with my bike. :mrgreen:



    Tokalosh

  • ThAzKat
    replied
    Originally posted by 01Katman
    Originally posted by THAZKAT
    14.7 is neer sea level and anywhere else will be higher. Thus the reason my bike runs richer now than it did in Arizona. Arizona is at sea level in Phoenix or damn close and at 14.7 a pre 98 750 or mine ran 97 hp.
    what kind of exaust do you have on there?? with that combo to make 97hp it seems everyone else is down in the 80's. i'm at 867ft. or thats what the airport says the elevation is here that should be lower that pheonix or close to it.
    That is on a pre98, 93 to be exact, 750 and so stock the air/fuel mixture caps were still in place.

    Leave a comment:


  • Tokalosh
    replied
    Originally posted by lu6an
    Tokalosh - so how much did they charge for the rejetting and dyno?
    It came to 140.00. I think it was reasonable considering that it was pulled apart 4 times and spent most of the day on the Dyno.

    Tokalosh

    Leave a comment:


  • Anonymous
    replied
    Originally posted by trinc
    Originally posted by kickitjp
    EDR?
    http://www.edrperformance.com/


    tim
    Oh, I was actually implying....Wow, you take it to EDR?

    Leave a comment:


  • lu6an
    replied
    Tokalosh - so how much did they charge for the rejetting and dyno?

    Leave a comment:


  • trinc
    replied
    Originally posted by kickitjp
    EDR?
    http://www.edrperformance.com/


    tim

    Leave a comment:


  • 01Katman
    replied
    Originally posted by THAZKAT
    14.7 is neer sea level and anywhere else will be higher. Thus the reason my bike runs richer now than it did in Arizona. Arizona is at sea level in Phoenix or damn close and at 14.7 a pre 98 750 or mine ran 97 hp.
    what kind of exaust do you have on there?? with that combo to make 97hp it seems everyone else is down in the 80's. i'm at 867ft. or thats what the airport says the elevation is here that should be lower that pheonix or close to it.

    Leave a comment:


  • Anonymous
    replied
    EDR?

    Leave a comment:


  • trinc
    replied
    Originally posted by The CyberPoet
    Originally posted by trinc
    here's my first run w/ sniffer
    Note that the dyno operator (someone I trust quite well -- a mechanical engineers by degree, and former investment analyst turned MMI mechanic) said that although 14.7 was theoretical perfect burn, DynoJet's tuning (both in their jetkits and fine-tuning on the dyno) always targets an idealized 13:1 air-fuel ratio as being optimal for power performance... I was rather amazed at that statement, thinking they would target a 13.8 to 14.2 range... but in retrospect, shooting for 13 should keep it from going too lean (i.e. - above 14.7) even in the worst scenario (high-rpm, shut-throttle decelleration) to keep the engine cooler and more ready to respond to fresh throttle inputs.

    Cheers
    =-= The CyberPoet
    on that run i was running the clip in position 2 and a 120 main jet.
    since i've raised the needle to 3rd position and went to a 118 main.

    i really need to make another run one of these days ! they are really busy building race motors & the owner crashed at the track so they are super busy now

    tim

    Leave a comment:


  • ThAzKat
    replied
    14.7 is neer sea level and anywhere else will be higher. Thus the reason my bike runs richer now than it did in Arizona. Arizona is at sea level in Phoenix or damn close and at 14.7 a pre 98 750 or mine ran 97 hp.

    Leave a comment:


  • The CyberPoet
    replied
    Originally posted by trinc
    here's my first run w/ sniffer
    Note that the dyno operator (someone I trust quite well -- a mechanical engineers by degree, and former investment analyst turned MMI mechanic) said that although 14.7 was theoretical perfect burn, DynoJet's tuning (both in their jetkits and fine-tuning on the dyno) always targets an idealized 13:1 air-fuel ratio as being optimal for power performance... I was rather amazed at that statement, thinking they would target a 13.8 to 14.2 range... but in retrospect, shooting for 13 should keep it from going too lean (i.e. - above 14.7) even in the worst scenario (high-rpm, shut-throttle decelleration) to keep the engine cooler and more ready to respond to fresh throttle inputs.

    Cheers
    =-= The CyberPoet

    Leave a comment:


  • trinc
    replied
    Originally posted by The CyberPoet
    Update: I just got off the phone with Ivan, and he sez...
    "that big dip [in the fuel-air ratio around the halfway mark] is a combination of a bad resonance in the exhaust and the fact that some DynoJet's Dyno's [including this model] use a load control that is artificially high". He asked if I could get it run again with the load-control off (since the drum weight alone is 800lbs), in which case he would expect the major dip half way through the RPM range to become a very small downward dimple instead.

    He also again re-emphasized the idea of using a weaker spring or cutting the stock springs down -- said it would reduce that off-idle initial drop depth and increase the speed of the rebound upward as the engine starts to compensate for the throttle coming wide-open. I'm going to talk to the dyno guy later this week and see if I can get him to run it again with the load-control turned off to see what happens.

    Cheers
    =-= The CyberPoet
    thanks for posting that CP - interesting results & shows why fine tuning is important.

    i will only add that with the dynokit i used (k$n label ) it came with new springs that i thought were a bit stiffer. the instructions stated you could use them or not ( i did ). i've never been able to 'tune' out the off idle problem - it would be interesting to see a new run with a cut spring.

    tim

    here's my first run w/ sniffer

    Leave a comment:


  • The CyberPoet
    replied
    Originally posted by THAZKAT
    where is the pre98 750 kit?
    Is there one? Did you bring him a pre-98 750?
    Go the easy route: swap to the post-98 carbs :P


    =-= The CyberPoet

    Leave a comment:


  • The CyberPoet
    replied
    Update: I just got off the phone with Ivan, and he sez...
    "that big dip [in the fuel-air ratio around the halfway mark] is a combination of a bad resonance in the exhaust and the fact that some DynoJet's Dyno's [including this model] use a load control that is artificially high". He asked if I could get it run again with the load-control off (since the drum weight alone is 800lbs), in which case he would expect the major dip half way through the RPM range to become a very small downward dimple instead.

    He also again re-emphasized the idea of using a weaker spring or cutting the stock springs down -- said it would reduce that off-idle initial drop depth and increase the speed of the rebound upward as the engine starts to compensate for the throttle coming wide-open. I'm going to talk to the dyno guy later this week and see if I can get him to run it again with the load-control turned off to see what happens.

    Cheers
    =-= The CyberPoet

    Leave a comment:


  • ThAzKat
    replied
    where is the pre98 750 kit?

    Leave a comment:

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