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Thread: STIC jetting thread:

  1. #911

    Default Re: STIC jetting thread:

    George just sent you an email to see if my carb has been posted back, sucks not having a running bike
    2018 KTM 300 XC
    2018 KTM 500 EXC
    2018 KTM 300 EXC TPI 6 Days - Gone
    2015 Husky FE 501 - Gone
    2014 Husky FE 350 - Gone
    2010 CRF250R - Gone
    2009 Husaberg FE450 - Gone

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  3. #912

    Default Re: STIC jetting thread:

    Bowser, email at vortex@sticfuel.us I will check shipping. Bob

  4. #913

    Default Re: STIC jetting thread:

    Quote Originally Posted by STIC Fuel Systems View Post
    Bowser, email at vortex@sticfuel.us I will check shipping. Bob
    Already did and no reply.... Sent again yesterday 24/3/20 when I posted the above message
    2018 KTM 300 XC
    2018 KTM 500 EXC
    2018 KTM 300 EXC TPI 6 Days - Gone
    2015 Husky FE 501 - Gone
    2014 Husky FE 350 - Gone
    2010 CRF250R - Gone
    2009 Husaberg FE450 - Gone

  5. #914

    Default Re: STIC jetting thread:

    Quote Originally Posted by bowser View Post
    Already did and no reply.... Sent again yesterday 24/3/20 when I posted the above message
    Another email sent and no reply. Wish I never sent the ****ing thing now, could see this happening from a mile away
    2018 KTM 300 XC
    2018 KTM 500 EXC
    2018 KTM 300 EXC TPI 6 Days - Gone
    2015 Husky FE 501 - Gone
    2014 Husky FE 350 - Gone
    2010 CRF250R - Gone
    2009 Husaberg FE450 - Gone

  6. #915

    Default Re: STIC jetting thread:

    It's on the way!!

  7. #916

    Default Re: STIC jetting thread:

    Quote Originally Posted by STIC Fuel Systems View Post
    It's on the way!!
    thanks, frustrating when you keep telling me to email you and you don't reply
    2018 KTM 300 XC
    2018 KTM 500 EXC
    2018 KTM 300 EXC TPI 6 Days - Gone
    2015 Husky FE 501 - Gone
    2014 Husky FE 350 - Gone
    2010 CRF250R - Gone
    2009 Husaberg FE450 - Gone

  8. #917

    Default Re: STIC jetting thread:

    I installed a stic block in my 2019 250xc with the hope to gain a smoother more liner throttle response, not necessarily more acceleration. Throttle response is much improved from stock. It pulls smoothly at very low rpm's in tight technical sections better than stock. I'm happy with that. What I would like to improve is gas mileage. With such large pilot and main jets mileage suffers. I ride very long trail sections that may go 100 miles between gas ups. My question is why can't I loop the bowl vent tube? Stic stated not to do this. What's the engineering reasoning? Jetting is 36mm carb, 113a tube, unnotched #7 slide, 190 main, 50 pilot, 3 3/4 AS.
    19 KTM 250XC
    18 KTM 350EXC
    04 Honda 150CRF
    78 Husky 390 Auto
    74 Husky 400WR (bike I made "A" rider on)
    72 Ossa 250 Pioneer

  9. #918

    Default Re: STIC jetting thread:

    Quote Originally Posted by jims View Post
    I installed a stic block in my 2019 250xc with the hope to gain a smoother more liner throttle response, not necessarily more acceleration. Throttle response is much improved from stock. It pulls smoothly at very low rpm's in tight technical sections better than stock. I'm happy with that. What I would like to improve is gas mileage. With such large pilot and main jets mileage suffers. I ride very long trail sections that may go 100 miles between gas ups. My question is why can't I loop the bowl vent tube? Stic stated not to do this. What's the engineering reasoning? Jetting is 36mm carb, 113a tube, unnotched #7 slide, 190 main, 50 pilot, 3 3/4 AS.
    Dear Jim, great questions. Here are the answers to your questions. Here’s what happens when you run the vent lines to the airbox; it goes lean. The carburetor functions on a process called differential pressure drop; atmospheric pressure (14.7 psi at sea level) pushes on the surface of the fuel in the float bowl (this is the higher pressure); air and suction flow communicating with outlets in the carburetor bore creates a shearing lower pressure drop; the higher pressure flows to the lower pressure.
    Notice that the vent lines and openings in the carburetor body are a determinate size. What happens in the real world; as the fuel is displaced it uses a certain amount of air; when fuel displacement exceeds the available air volume, the atmospheric air is reduced. During the 1990s Polaris accomplished this by placing restrictors in the vents within the carburetor body, and they ran the vent lines into the airbox; this effectively caused the carburetors to become lean on the big end. You could accomplish this by plugging some of the vent lines (caution do not plug all of them as the carburetor will not function. If you run the vent lines into the airbox you will place into a partial vacuum (reducing the atmospheric pressure).

    The reason the STIC metering block uses larger jets is due to the fact the STIC tube is heavily emulsified with a large number of passages (+11) that blend air in an adiabatic process (cooling and expansion), expanding and cooling while merging with the fuel. It takes additional fuel and air to accelerate. Easy on the throttle will also improve the mileage. You could ultimately go to a larger 38mm Keihin Air Striker; the STIC is designed to work with the larger carburetor, more air with the larger bore will improve the mileage. The smaller carburetors were utilized by some manufacturers due to poor carburetor signal; the STIC does not suffer for lack of signal; thus, it accelerates from all positions without hesitation. The STIC metering block is scientifically designed to accomplish a multitude of operations simultaneously. Hope this answers your questions, you can contact me directly at email vortex@sticfuel.us or phone at 715-479-7822. Inventor X
    Last edited by STIC Fuel Systems; 03-27-2020 at 12:19 PM.

  10. #919
    KTMTalk Member
    Join Date
    Jan 2012
    Location
    Surrey Downs
    Posts
    919

    Default Re: STIC jetting thread:

    Quote Originally Posted by jims View Post
    I installed a stic block in my 2019 250xc with the hope to gain a smoother more liner throttle response, not necessarily more acceleration. Throttle response is much improved from stock. It pulls smoothly at very low rpm's in tight technical sections better than stock. I'm happy with that. What I would like to improve is gas mileage. With such large pilot and main jets mileage suffers. I ride very long trail sections that may go 100 miles between gas ups. My question is why can't I loop the bowl vent tube? Stic stated not to do this. What's the engineering reasoning? Jetting is 36mm carb, 113a tube, unnotched #7 slide, 190 main, 50 pilot, 3 3/4 AS.
    Compared to my 36mm carb you allot richer i am sea level not real cold tho 15 to 30 deg c, if it runs smooth leave as is, i cant run a 50P just to rich

    you can adjust the float 1mm lower than stock that would then be 7.5mm that will help, you can loop the carb bowl vent hose, you have 4 others that are not routed to the airbox unless you have done that, loop it and see it's easy to reverse
    Last edited by dmills; 03-27-2020 at 11:36 PM.

  11. #920

    Default Re: STIC jetting thread:

    George, thanks for the explanation of the physics of carb operation. You may have misunderstood what I meant by looping the vent line. I don't want to run it into the air box, just loop it 360 degrees so the top of the loop is above the float bowl level. The end of the line will then hang down with the other vent hoses.
    19 KTM 250XC
    18 KTM 350EXC
    04 Honda 150CRF
    78 Husky 390 Auto
    74 Husky 400WR (bike I made "A" rider on)
    72 Ossa 250 Pioneer

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