MC Boxstock

Martin County Box Stock

Martin County Box Stock is a class of open karts that uses a 6.5 hp Honda "clone" engine. This adult class is for anyone who is looking for an ecnomical way to get into kart racing. Most racers in the class are adult novice racers. Class and engine specifications are listed below.

MC Box Stock Racers: (l-r) Tim Gottshall, Keith Henderson, Mark Freese, Chris Ellis, Kami Lipari, Ron Armstrong, Paul Destito, Jennifer Martindale, Chris Martindale and Ricky Moxley

2009 Point Leaders: (l-r) Kami Lipari, Ron Armstrong and Chris Martindale

Martin County Karting Association Modified Box Stock Rules:

Martin County Modified Box Stock is not FKA or ARKA legal. The class is unique to Martin County Kartway.

Class Structure
MODIFIED BOX 6.5 OHV Honda clone. Age 15 years & up – 375 lbs. – Alcohol Only – 6.5hp OHV stock engine (any color). Steel drum, Noram-type clutch only with 16t gear.

Any clone motor may be used. The engine does not have to be a Box Stock Project (yellow) motor. The Honda clone motor may be purchased at any retailer including Harbor Freight and may be prepared by the owner or any motor builder. The only modifications allowed to the motor are:

-Aftermarket air filter and adapter may be used.
-governer must be removed.
-low oil sensor must be disabled or removed.
-ignition kill switch may be removed.
-aftermarket header with muffler may be used.
-Carberator jets must be drilled to run methanol.

Carburetor must remain stock except jet size (must be modified to burn alcohol). Floor mounted fuel tank required (stock tank to be removed). Pulse type fuel pump allowed. Fuel pump must be pulsed from either the crank case or the valve cover. Stock emulsion tube must be used and unaltered.

Header and Muffler Requirements: Any one-piece header. A maximum 2.5” long swedged flange is required at the end of the pipe for muffler mounting. Maximum outside longest length of the header, including flanged portion for muffler is 22”. Header may be bent in any configuration to keep it away from the driver and so the muffler will not extend past the rear bumper. The RLV B-91 muffler/silencer is mandatory and may not be modified in any way. Header must be securely wrapped from flange to swedge prior to the race.

All MC Box Stock motors must meet posted AKRA BSP specifications (with the exception of carb. jet size and header requirements). All motors must submit to tech inspection upon request.

Tire Rule: Maxxis (any compound) or Vega tires may be used. All four tires on a kart must be of the same brand.