Two Strokes Are a Superior Racing Engine

by Rodd, Karen & Kids
(Richmond, VA)

The combination of fewer moving parts, and maximum horsepower at a lower RPM makes two strokes superior in racing conditions. I do believe that four strokes have their place in play / trail bikes as they are very reliable under regular riding conditions whereas 2t's tend to need rings, etc on a regular basis whether racing or not. Four strokes however when raced are required to run at such a high rpm in order to make the necessary horsepower to compete that they have evolved into ticking time bombs that still require a large displacement advantage (handicap) in order to compete (i.e. 125 2T vs. 250 4T & 250 2t vs 450 4T).

Also, two strokes have a better ability to rapidly accelerate in situations that are preset in motocross, and while four strokes have evolved a great deal it still takes twice as many rotations (strokes) to accelerate at the same rate resulting in increased engine wear and eventual failure.

That being said two strokes fail as well, but compare the cost associated with a complete top end rebuild on a two stroke (+/- $200) with a four stroke (+/- $1000). Bottom line in my personal opinion... If it's a four stroke it should have a license plate and turn signals on it.

Current Stable of 2 Strokes:

99 Husqvarna WR360
78 Yamaha YZ250 (Post Vintage Racer)
75 Yamaha DT400 (Enduro Play Bike)
73 Yamaha AT125 (Wifes Enduro Play Bike)
71 Yamaha AT125 (Sons Enduro Play Bike)
95 Yamaha Blaster (Family Toy)
09 Kawasaki KX85 (Sons Racer)

Current Stable of 4 Strokes:

02 Harley Springer Sportster (One for the Road)
09 Kawasaki KLX140 (Kids/Wife Trail Bike)
02 Yamaha Raptor 80 (Youngest Daughters Toy)

What it all boils down to... If you wanna haul ass, you gotta mix your gas!

- That's an impressive list of horses you have. Thanks for your input Guys.

Hayden -