Spec.---------------------------
Displacement：3.49 cc / 0.213cu.in.
Bore: 16.08mm / 0.633 in.
Stroke:17.20mm / 0.677 in.
Output 2.8 ps / 2.76 hp / 35,000 r.p.m.
Practical rpm range: 4,000-45,000 r.p.m.
Weight:340g / 11.99 oz.
Standard accessories：
Glow plug RP7 /Dust cap set/Exhaust seal ring
TR02 EFRA2165 /MR03-WC Silencer & Exhaust Manifold
O.S. SPEED Flywheel Colette

Shoki Takahata won the 1st prize of 2019 IFMAR 1/8 IC Track World Championship held in Steel City Speedway, California, USA on 02 November, and Takaaki Shimo won the 2nd.　　 Both of them used O.S. SPEED R2104. It is the first time for O.S. Engines to win the championship in this category. In commemoration of the one-two finish, we are proudly releasing O.S. SPEED R2104 WORLD CHAMPION EDITION. The picture shows a prototype.