Download GENERAL RULES 1. Only stock Honda GX120K1HX2 engine and gear box will be used in this class. All parts will be stock Honda specifically made for the Honda GX12OK1 HX2. 2. All stock Honda parts must be used and properly installed with the following exceptions: A. Governor system may be partially or fully removed with the exception of the steel drive gear on the crankshaft. This gear must remain intact. If shaft is removed hole must be plugged. Hole can be tapped for thread or epoxy. No wielding. B. Air cleaner may be removed. If used, all parts except for top cover and foam filter must be removed. If have stock air filter, must have vent hose connected to air filter. If factory air filter is removed, then hose from valve cover must go into a catch can. C. Stock Honda fuel tank must be removed. D. Recoil starter must be removed. Pull cup may be cut down for washer. E. Exhaust: Stock Honda muffler will be removed. Mounting flange may be cut off of muffler and used as adapter flange. Any transition from the “D” shape of the exhaust port to round must take place with in the thickness (0.250″ max.) of the flange. This applies to all exhaust systems. No steps or tapers allowed, grind marks are allowed past .25″ flange area. No suspension for exhaust flange or pipe infraction just disqualification. If an after market flange is used, maximum allowable flange thickness will be 0.250 inches. If slip on type flange assembly is used, pipe stub will be a maximum 0.880 inches outside diameter tubing with a maximum overall length of 1.500″ inches. Pipe stub must be inserted into exhaust pipe at least 0.750 inches and will have minimal exhaust leakage. Muffler to be used will be 4 to 8 hp Briggs & Stratton, part number 294599 or equal equivalent. Muffler will be internally unaltered except that the round cup shaped baffle may be welded to the perforated baffle without moving it’s original location. Threads will not be removed from muffler. Exhaust pipe will be a maximum of 1.000″ inches outside diameter with a length of 20.0″ to 26.0″ including a threaded pipe coupler to welded to the end of the pipe in order to screw muffler in place so that muffler may be removed for inspection. Pipe coupler will be a standard, unaltered, ¾” NP, threaded coupler. Length will be 1.000″ inches minimum to 2.250″ inches maximum. There will be no steps or tapers in exhaust pipe or flange assembly. Exhaust pipe length will be measured by using a small diameter hose inserted though pipe to measure over all length. Flange and coupler will be included in the overall length when measuring pipe. No coating of any type may be applied to the interior of any part of the exhaust system. The intent of this rule is to have all of the exhaust pass through the muffler. All measurements are to be taken with the component pieces in the same position as they were installed and on the car. F. Choke butterfly and shaft must be removed. Hole may be filled only with silicone. G. Oil level switch may be disconnected but switch assembly must remain intact in crankcase. H. Gearbox may be rotated to any desired position. I. Main jet in carburetor may be a maximum of #65. J. Off-On ignition switch may be removed, and hole covered. (any material; no welding)
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