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Over the years
karting has seen a several classes come & go. 125 Shifters are a
unique breed of their own as they seem to have gone a full circle
due to the extreme durability and fun factor they offer.
The supply chain
is structured differently from most karting products, and as such
there are not many kart shops that will carry a complete motor
package. Many do carry replacement parts and that will increase
over time. Unlike most kart parts Kart Retailers only get a
discount if they also happen to be a Honda retailer, so they pay the
same price anyone else does.
If you know of a supplier who would like to be added
to the suppliers directory have them email us at
tech@kartweb.com with a list of the parts and services they
offer.
Basic parts list
-
Honda CR125
Kit Motor with 1993-96 Gearbox and 1999 Cylinder/Head/Ignition
-
Exhaust Power
valve Plug
-
J-Arm Lever
-
Exhaust Flange
-
Carburetor
-
Pipe &
Silencer
-
Fuel Pump
-
Motor Mount
-
Drive
Sprockets
-
Axle Sprockets
-
Radiator Hoses
& routing
CR125 Motor Kit
Honda supplies
motors in Kit Form to Honda dealers as a big box of 343 parts.
While this package is available to all their dealers, only a few of
them have chosen to fully support the karting market by keeping
inventories and low margin pricing. Some even assemble the motors
which is probably the best option for most karters. If you know
what you’re doing to put one together, plan on about 3 hours to open
the bagged parts and sort them out, and another 3 hours to
assemble. It’s probably best to buy a motor already assembled.
Honda motors are constructed such that a “blueprinted” assembly is
pretty much limited to getting the exhaust plugs correctly shaped,
base gasket thickness correct and advancing the stator timing.
Motor Kit prices
vary from about $1600 in unassembled form to as much as $2400 in
assembled form. In addition to Motor Kits are the accessories
to consider.
Honda Kit Motors
Extreme Motorsports
(530) 222-6787
Price for an
assembled 125, including Ignition, Exhaust Plugs, Kickstart Boss
cut/welded and plugged - $1899
J.R. Clasen
Phone: 760.715.7740
Email:
johnclasen@adelphia.net
Expertly
Assembled Honda
CR 125 (99’ Kit Engines)
·
HPP Power Valve Plugs installed
· HPP
Shaft Plug installed
· Kick
Start Plug installed
·
Pulse Tube installed
Kokomo Honda
394 S. CR 00 EW
Kokomo, In
46902-5105
(765) 864-0500
Service Honda
5634 Hohman Ave.
Hammond IN. 46320
800.828.5498
Honda of Troy
4790 South Dixie Drive Dayton OH 45439
Phone: (937) 294-1577
Toll Free: (800) 755-2112
Leary Hi-Tech
(Dyno tested Turnkey packages)
(619) 670 -0754
Acceleration Karting
5225 S. Valley
View Blvd. Ste. 7
Las Vegas, NV 89118
Toll Free 1-888-466-KART
Fastech
Racing
Fastech-Racing
425 Garden Ave. #10
Monterey, CA 93940-3739
Orders Toll Free: 1.888.333.4181
CKT Racing
Engines
2901 West Main
Street
St. Charles Il 60175
Phone: 630-513-5857
SRS Engines
Murphy Texas
972 422 5847
Accessories
-
Exhaust Power
valve Plug
-
J-Arm Lever
-
Exhaust Flange
-
Carburetor
-
Pipe &
Silencer
-
Fuel Pump
-
Motor Mount
-
Drive
Sprockets
-
Axle Sprockets
-
Radiator Hoses
& routing
Exhaust Power
valve Plug
Extreme Motorsports (530) 222-6787
Swedetech
J-Arm Lever
Extreme Motorsports (530) 222-6787
Swedetech
Exhaust Flange
Shockwave Karting (best quality) 800-608-3457
Extreme Motorsports (530) 222-6787
Swedetech
CKT Racing
Engines 630-513-5857
Carburetors
Kiehn, Mikuni –
Sudco (Look up Dealer List)
Kiehn, Mikuni -
Extreme Motorsports (530) 222-6787
Dell’Orto VHSB 38 –
Green Flag – (248) 674-2325
Pipe
& Silencer
RLV
RCE
Extreme Motorsports (530) 222-6787
Swedetech
Fuel
Pump (Round Mikuni)
Extreme Motorsports (530) 222-6787
Swedetech
Motor
Mount
Shockwave Karting 800-608-3457
Extreme Motorsports (530) 222-6787
Drive Sprockets
(15T – 18T) and Axle Sprockets (22-29T)
·
Most Kart Retailers can order Sprockets
Radiator
& Hoses
Shockwave Karting (best quality) 800-608-3457
Extreme Motorsports (530) 222-6787
Most Kart Retailers can order Radiators
Most Auto Parts stores carry Hoses required
What to know about
Performance and Parts selections
Motors won’t
make a much difference in the bottom end assembly if it comes from
one of the above sources. There may be several other great sources
they just haven’t yet been identified to us, so this list will
probably grow.
Gauze type Air
Filters will perform slightly better then Air Boxes without foam
filters, and much better then Airboxes with Foam Filters. The noise
output of a 125 Stock with an Air Filter is comparable to a CIK
legal ICC so Airboxes should avoided where CIK Legal ICC’s are
allowed to operate.
Japanese
Carburetors like the Keihn and Mikuni usually need to be modified to
a Pump-Around style to avoid flooding and starvation issues.
Pump-Around Mods are relatively easy to do but still require a twin
fuel pump. Instructions for Pump-Around conversions are available
in the Kartweb Subscriber Service or can be updated commercially for
about $150. The Dell’Orto VHSB 39 has been added to the list of
Carburetor Options and offers identical performance to the 38mm
Keihn and Mikuni Models although no Pump-Around modifications are
necessary.
Exhaust Flanges
are available from several sources, although we tend to prefer the
Shockwave version for the durability and tight fit on Pipes.
Flanges will need O-Ring replacements and these are available at
most local Bearing Shops. Look for a Viton O-Ring and order 50 of
them at a time to save money through the year.
Pipe & Silencers
are the most controversial component of the pick. The RCE T3 and
Leary Hi-Tech generally offer the best choices while the RLV T4, and
RLV B4 have been proven to work very well also. By limiting the
port timing, compression, and ignition, any of these pipes can be
tuned with header spacers to achieve relatively equal performance on
the track. 12” minimum Silencer length is specified, although a 14”
may actually be a better choice to build backpressure at higher
revs. There may be a spec pipe & silencer coming in the future
although there will be a minimum 6-month warning to the requirement
of a spec pipe. Most pipes tend to lose their “tune” after a full
season of racing anyway.
Radiators may
range from “Heater Core” sized units up the “Barn Door” size.
Generally a radiator that measures 150 square inches will give a
Delta T of about 40° on a Sprint track for a 125 Stock – so at 95°
ambient, the water temp will run about 135°. The 125 Stock is a
little more tolerant of higher temps then a fully modified Moto so
take that into account on sizing a radiator.
A properly
assembled and tuned 125 Stock will produce in the range of 35 HP and
offer a good usable powerband from 9500 RPM to 12,200 RPM.
Comparing the Stocker to a fully blueprinted/Modified S1 spec 125
producing 41 HP on the same Kart with the same driver would be about
1.2 seconds faster on the typical Sprint track. The S1 Spec motor
will have a much wider powerband and require 4-6 less shifts per
lap. The 125 Stock will emphasize Carb Tuning, Gearing, chassis set
up, and most of all driving.
Keep watching
for future Kartweb articles on the Stock 125 Shifter class. Next up
will be a guide coming on complete package installation along with
cooling and fuel hose routings. Also in July we are opening a
registry for those competitors who are competing in Stock 125
Shifter class. |
