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DEFINITION
A Group 3 lawn mower is a small garden ride-on, wheel driven machine designed to cut grass for domestic purposes.
See General Rules and Regulations and remember, if it doesn’t say you can do it, you can’t do it.
ENGINES
1.The upper horsepower limit is 10hp (manufacturers rating) for a side valve engine and 7.5hp for overhead valve engines.
2.Engines as fitted by the manufacturer (including carburettor), or an engine offered by the manufacturer as an option for that particular mower, must be used. The engine must be retained in its original position, or if an optional engine is used the crankshaft must be on the original axis. You may be asked to provide proof.
3.Engines must remain standard and may not be modified or ‘blue printed’ in any way apart from the following:
•The exhaust pipe and silencer may be altered or changed.
•The governor may be removed or disconnected.
•No other alterations or modifications are allowed.
4.Should a rebore become necessary because of wear or damage, only the manufacturers standard or ‘oversize’ available piston and rings etc may be used as replacements.
5.The fuel for any engine must be ordinary pump fuel and be free from any performance / power increasing additives.
6.Should the entrant be in any doubt about the legality of his/her engine, they must consult the race committee.
DRIVE
1.The original type of drive i.e. belts, chains, gears or whatever, must be retained. Pulleys, gears etc, may be changed for bigger or smaller ones to alter ratios. If the drive was originally through a chain case on the side of the mower, it must continue to be through the chain case on the original side.
2.A Gearbox may only be used if originally fitted, then it must be standard and to the original specification. No variable transmissions i.e. no torque converters or variable pulleys are permitted.
3.Lawn mower tyres and wheels must be used. Cleated or Quad tyres are forbidden. Particular attention should be paid to the fixing of wheels to the axles.
SAFETY
1.Mowers must be fitted with an automatic throttle closing device, which will work whenever the driver’s hand or foot leaves the throttle control. Two independent throttle closing devices to be used e.g. two springs.
2.An ignition cut out, which will work under any circumstances should the driver loose contact of the mower. A noose around the driver’s wrist is not acceptable. The cut out connection must be positively fastened both to the driver and the cut out and must not extend further than 3 feet.
3.No sharp edges or protrusions are allowed.
4.A braking system must be fitted.
5.Any part of the exhaust pipe that could be used as a grab handle must be wrapped or guarded.
CHASSIS and BODYWORK
1.The overall chassis profile may not be altered from standard. By chassis we mean the basic chassis
specification, i.e. body, bonnet, fairings, mudguards etc, as produced by the manufacturer. By profile we mean lengths, widths, heights, and visual appearances etc. The only exceptions are as follows:
•Discreet out of sight strengthening to the chassis
•Discreet transmission accommodation i.e. if a large drive pulley will not fit in the chassis without cutting out the metal, then this may be done, but only as much as necessary.
2.Seats may be lowered, but only to the seat panel, seat panel to axle centre may be checked by refering to the homologation table.
3.The actual seat may be modified or changed but the backrest may not be higher than the driver’s shoulder blades.
4.Suspension of any kind, springs, shock absorbers, may not be fitted to any mower unless fitted as original equipment and in this case must all remain exactly as standard.
5.Cutting blades must be removed.
HOMOLOGATION
It is the responsibility of members to contact the race committee to agree details, dimensions, and evidence of eligibility of any lawn mower type not currently homologated, prior to its acceptance.
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