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Auto Cycle Union - The governing body of UK motorcycle sport

 
Junior Motorcycle Grasstrack Categories
 
Yorkshire Junior Grasstrack Club operates according to the class rules and regulations laid down by the governing body of British motorcycle sport, the ACU. grass track classes are governed by both rider age and engine capacity. The following information describes the differences between these classes and is intended as a general guide only. Please feel free to contact us if you require any further information.
Auto Cadet  
The ideal way to start the sport for 6 and 7 year old riders. Machines used are fully automatic 50cc bikes ranging from the ever popular Yamaha ‘Pee-Wee’ PW50 to highly tuned mini motocross bikes with speeds of up to 50mph. These simple to ride machines offer the opportunity for youngsters to learn the skills required in a safe and controlled environment.
Auto Cadet

Cadet  
A class for 6-8 year old riders using purpose built machines of up to 60cc (2-stroke) or 90cc (4-stroke). The class presents the ideal opportunity for youngsters to get their first taste of a real grass track bike and competition is always fast and furious. Also eligible for this class are motocross machines of up to 65cc, most popular of which is the Kawasaki KX60.
Cadet

Junior  
A class comprising of pure grass track machines using engines of up to 100cc (2-stroke) or 130cc (4-stroke). A very competitive class which always guarantees a good turnout of riders, Juniors range in age from 9-11 years. Similar in overall size to the Cadet bikes, the 100cc machines offer quite a bit more speed and power.
Junior

Intermediate
12 to 14-year old riders on 2-stroke powered machines up to 150cc or 4-strokes of up to 200cc. The light weight of a grass racing bike combined with the power of a modern 125cc engine makes a potent combination. Usually slightly larger in physical size than the 100cc bikes, Intermediate is largest engine capacity class reserved exclusively for youth riders.
Intermediate

Senior A 250
Historically a favourite class of grass track stalwarts, most 250cc machines are powered by single cylinder ex-motocross engines. With razor sharp handling due to their light weight but explosive power delivery, 250's are not always the easiest of machines to handle. Sadly not now as popular as they were, in youth grass track they can be ridden by 15-17 year old competitors.

Senior A 250cc

Senior B 350
A fairly recent and increasingly popular class in youth grass track. Most 350cc machines use speedway derived 4-stroke engines running on methanol. Hugely powerful, yet infinitely more tractable than the 2-strokes, most machines have a 2-speed gearbox. In youth competition riders will range in age from 15-17 years, though most have progressed through the ranks before attempting to manage this sort of power!
Senior B 350

Motocross Classes
You don't necessarily need a grass track bike to race with us! - Yorkshire Junior Grasstrack Club also runs classes specifically for Motocross bikes of 65-125 cc. You don't need to modify your bike to take part, and many of our riders are also regular Motocross competitors.
Motocross 65
One of the most popular classes in youth motocross, and becoming increasingly popular at club level in youth grass track racing. Whilst the vast majority of machines used are the ever popular Kawasaki KX 60 and KX 65, the class is open to all MX type machines of up to 65cc with manual gearbox. Riders range in age from 7 to 11 years
Motocross 65

Motocross 85
Another class popular in junior motocross and becoming increasingly popular in youth grass track. Big and small wheel versions of these rapid machines are eligible at club level, and for the first time this year there has been a new class introduced at National Championship level for small wheel versions. Riders range in age from 9-15 years.
Motocross 85

Motocross 100/125
A real 'handful' on a flat grass oval, this class can produce some exciting racing. A modern 125cc motocross bike combines light weight with plenty of power to break the back end away in the corners! -Riders range in age from 14-17 years.
Motocross 125

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