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,
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).
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
(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
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.
The only jetting change that we made to our preferred 2012 KTM 250SX
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.
Awesome! Incredible! Worth the money! Amazing!
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
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.
NOVEMBER 2011 / MOTOCROSS ACTION