Perfectly balanced power for today’s truggies!

With input from top truggy drivers, O.S. has developed the ideal engine for these hybrid hot rods! The 28XZ produces more low-end torque, providing the rpm/torque balance that heavier truggies require. The result is power that’s incredibly smooth, for truggies more drivable than ever thought possible!

• The larger head aids in cooling, and is a 2-piece construction with inner head button.
• A sealed front bearing and high-performance inner bearing are part of the new crankcase design.
• The high-performance con rod features oiled bushings.
• Three needles enhance fine-tuning on the 21J slide-valve carb.
• Comes with a high-performance P3 hot turbo plug.
• The Mark Pavidas Edition Tuned Pipe (OSMG2969) is the perfect accessory for the 28TZ; flywheel sets are required (OSMG2648 for Mugen, OSMG2649 for Kyosho, both sold separately) for certain truggy models.

SPECIFICATIONS
Stock Number: OSMG2074
Displacement: 0.284 cu in (4.65 cc)
Bore: 0.728 in (18.5 mm)
Stroke: 0.681 in (17.3 mm)
Practical rpm: 4,000-38,000
Power Output: 3.31 hp @ 32,000 rpm
Weight: 13.1 oz (375 g)
12830 28XZ Parts Listing