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Four-Stroke Technical Information

Exhaust Noise Test Data (67KB PDF file) - This PDF file contains exhaust noise level (dB) ratings for different model ATK, Bombardier, BSA, Bultaco, Cannondale, CZ, Gas Gas, Husaberg, Husqvarna, Thunder, TM, and VOR dirt bikes with stock and various aftermarket exhaust systems. Please go to the California State Parks Off-Highway Motor Vehicle Recreation Division Website for the latest edition. Submitted by John Franger

Free Lift Solution For Your Panterra 49cc (50) (Forums) - From the first day I bought the Panterra 50 for my son his biggest gripe was the ground clearance and it seemed to bottom out over the smallest of jumps. By soooner

Measurement of Exhaust Sound Levels of Motorcycles (40KB PDF file) - This SAE Standard establishes the test procedure, environment, and instrumentation for determining the sound levels of motorcycles under stationary conditions. By SAE Motorcycle Committee

Mini Four-Stroke (to 110cc) Powertrain & Drivetrain Related Specs - By 4Strokes.com Forums members

Modifying the Muffler of a DR70 (Forums) - In order to modify the muffler to make it sound like the name brand bikes all you have to do is follow a few simple steps... By RockOn

Baja Motorsports DR70 Rear Shock Mod (Forums) - Here is one solution for replacing the rear mono-shock on the DR70. By RockOn

The Guide to Derestricting Panterra Scooters (Forums) - By pranakhan

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