Machine Rules for 115cc Sports Production (115SP)

Eligibility of motorcycle Sports Production 115cc

This class is open to locally available Yamaha motorcycles that are 4 stroke (single cam/2-valve) 1-cylinder, 4 gears underbone configuration motorcycles. Maximum engine displacement is 115cc.

The following models are eligible for this category:

1. Yamaha Crypton Z
   (Internal Model Designation: T110; T110SE)
2. Yamaha X1
   (Internal Model Designation: JT110)
3. Yamaha Crypton R
   (Internal Model Designation: T105SE)
4. Yamaha Crypton S
   (Internal Model Designation: T105E)
5. Yamaha Vega
   (Internal Model Designation: T115LSE)
6. Yamaha Vega Force
   (Internal Model Designation: X-15)

General specifications

The following items MUST NOT BE altered:

1. Type of engine, number of cylinder.
2. The material and casting of cylinder, cylinder head, crankcase and gearbox.
3. The materials of the internal parts of the engines.
4. The angle of the cylinder head and cylinder relative to crankcase cover.
5. The materials, casting and shape of crankcase cover.
6. Piston stroke.
7. Maximum size of carburetor is 24mm. Minimum cross sectional area of intake mixture air passage. Jet needle, butterfly shaft, valves. Throttle valve shapes and its sectioned area is not concerned.
8. Fuel tank (excluding Inlet opening and fuel cork).
9. Primary gear ratio & number of gears.
10. Frame body must remain as originally produced by the manufacturer for homologated machine.

The following items may be altered, but must conform to the general specification. (This is for clarification only. Other parts not listed above can be altered or replaced. Change of specification means modification, changes or removal of the parts.)

1. Change of valves, port areas & change of compression ratio is allowed.
2. Setting of carburetor, attachment or size change of air funnel.
3. Inlet opening of fuel tank for fuel charge may be modified but cannot be relocated.
4. Change of fuel pipe and fuel cock.
5. Change of exhaust pipe and muffler, but must have silencer.
6. Change of clutch discs and specifications of spring. Manual clutch is allowed.
7. Transmission Gear ratios are free.
8. Kick starting device may be removed.
9. High comp piston aftermarket piston, piston rings, piston pins, clips.
10. Modification or removal of air cleaner box, wire harness and control wires.
11. Removal of speedometer (including meter gearbox and cable).
12. Removal of drive chain case and cover. Change of drive chain is allowed. A minimal cover is required This cover should prevent the possibility of a riders body parts getting caught between chain and sprockets.
13. Change of final gear ratio is allowed (front –engine and rear sprocket).
14. Maximum width of rims must be as follows:
    FRONT: 1.20 to 1.60 inches
    REAR: 1.60 to 2.15 inches
15. Modification and change of rear brake parts and system is allowed.
16. Frame body may be strengthened.
17. Modification and change of brackets and pedals including footrest.
18. Front suspension unit must remain as originally produced by the manufacturer. However the following internal parts of the fork can be modified: shims, hydraulic piston, oil passages, springs and spacers.
19. Attachment of stabilizer to strengthen or reinforcing rear swing arm is allowed.
20. Removal of dust seals.
21. Rear suspension unit may be replaced. The rear suspension spring is free. The internal part of the shock absorber can be modified. The rear linkage must remain as originally produced by the manufacturer.
22. Handle bars, clutch and front brake lever may be changed by an after market copy.
23. Steering dampers may be fitted. They must not act in any way as a steering lock limiting device.
24. Materials of streamlining, shape and material of seat cowling (However, expensive material such as carbon fiber and Kevlar are not allowed).
25. Removal of rear mudguard. Bodywork must retain overall stock shape.
26. All lubricants are open.
27. Adjusting and polishing any parts are allowed. (Adjusting is defined as: "To select each part or assembly complete within the limit of single or total tolerance"; i.e. that of valve clearance, ignition timing, etc. Polishing is defined as "To smooth rough surfaces of each part within its dimension limit", i.e. polishing ports, connecting rods, piston combustion chamber, etc).
28. Cutting unnecessary stays is allowed (including part of seat-rail).
29. Flywheel and ignition is free.
30. Disc brakes may be added / modified.
31. Intake manifold may be replaced.
32. The materials, dimensions and shapes of crankshaft assembly (may be modified but OEM parts, balancing ok).

Bodywork

All plastic bodywork parts must be complete, otherwise mentioned above, and should be properly fastened.

Fuel

Fuel must be UNLEADED only and locally available at retail outlets. Fuel test for samples shall be done during post event tech control.

Tires

Slicks and hand cut are not allowed.

The following items must be altered if the motorcycle does not comply

1. Motorcycles must be equipped with a functional ignition kill switch (within reach of hands while hand grips).
2. Removal of equipment, i.e. stands, rear view mirror, auxiliary and turn signals. Headlight, tail light and signal light lenses may be taped.

The following are not allowed

1. Use of special materials such as magnesium light alloy, reinforced carbon fiber, etc. when modifying or changing parts. Except for exhaust silencer.
2. Light alloy in the construction of front and rear wheel spindle shaft).

Noise control

Exhaust must have silencer.

Eligibility of competitors

All Novice & Beginner riders may compete in this class. Riders below 18 years of age would require parent’s consent. Expert riders classified by NAMSSA are not allowed.

Interested? Contact us!

Office Address: 16-A Makiling Street, Hacienda Heights, Marikina City

Telephone no.: (02) 571-5945, Mobile no.: (0927) 272-7145

Email address: yamahagrandprix@gmail.com