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MXA check markMXA TEAM TESTED

DICK'S RACING/THUNDER PRODUCTS, INC. INTELAJET CARB MOD

WHAT IS IT?  Dick's Racing progressively bores out the stock KTM 250SX two-stroke carb from 36mm to 39mm
and installs the creative Intelajet system from Thunder Products, Inc.  It fits on all KTM two-stroke
carbs from 2004 to 2012.
___________________________________________________________________________

WHAT'S IT COST?  $425.00 (carb bored progressively from 36mm to 39mm with Intelajet
installed); $30.00 (Intelajet mounting kit); $40.00 (taper-bore carb ends).
___________________________________________________________________________

CONTACT?  www.thunderproducts.com  or  (320) 597-2700
                       
www.dicksracing.com  or  (916) 722-2373
___________________________________________________________________________


WHAT STANDS OUT?  Here's a list of things that stand out with Thunder Products/Dick's Racing 36mm to 39mm mod.

   (1)  Stock KTM Carb.  Believe it or not, KTM mounts small 36mm Keihin PWK carbs on their
250cc and 300cc two-strokes.  Most two-strokes come with 38mm or larger carbs.

   (2)  Dick's Racing carb.  Dick Wilk taper-bores the stock KTM carb so that it flows from 36mm
to 39mm; he can also taper-bore the ends for even more power.  Tapering the carb's bore makes
the Keihin PWK work like a 36mm carb below one-third throttle but a big carb above that.

   (3)  Intelajet.  What is Intelajet?  It is the two-stroke equivalent of the dual fuel-injection nozzles
on the 2012 Kawasaki KX250F.  The Keihin carb functions normally below two-thirds throttle,
but as air velocity increases, excess fuel is sprayed out of the Intelajet's emulsion tube upstream
from the main jet.  It has the feel of a supercharger.  The Intelajet doesn't dump raw fuel into the
carb as much as it sprays a fine mist into the air stream to enhance fuel burn at high rpm.  The
amount of fuel coming through the emulsion tube is controlled by an air-bleed dial, which is
accessible to the rider.

   (4)  Jetting.   The only jetting change that we made to our preferred 2012 KTM 250SX brass
was to replace our 160 mainjet with a smaller 152, because the Intelajet emulsion tube spray
makes up for any loss in high-rpm fuel.

   (5)  Performance.  Awesome!  Incredible!  Worth the money!  Amazing!  Fantastic!  Unbelievable!
Pick the adjective that you like best.  The gain in top-end power and overrev was immediately
noticeable to every MXA test rider.  It has no effect on power below two-thirds throttle, but once the
mist kicks in, the KTM 250SX feels like it has a jet pack attached to it.

___________________________________________________________________________

WHAT'S THE SQUAWK?  We had to fiddle with the needle clip and air screw to keep the
midrange tuned to the high-rpm overdrive, but it was not a big deal.

Motocross Action rating

                                                                                                                NOVEMBER 2011 / MOTOCROSS ACTION     109

 
 


THUNDER PRODUCTS, INC.

21676 Deep Lake Road
Richmond, MN  56368
Phone - 320-597-2700
Fax - 320-300-4830

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Summer business hours:  Mon through Thurs 9am - 5pm CDT
Friday and Saturday by chance only.  Closed Sundays.

Technical questions can be answered by telephone only during regular business hours.
2003-2012 Thunder Products, Inc.