Out of Stock
OS Engines - Item No. OSMG2097
4.1 out of 5 Customer Rating

O.S. Speed R21GT 1/8 GT Engine with T-2060SC Pipe

RC Club points earned on this item shown at checkout.


We are proudly announcing O.S. SPEED R21GT for a relatively new category 1/8 GT class. The new engine aims at IFMAR world championship to be held in the United States in January, 2020. So the design of the engine is fully conformed to IFMAR regulation. The crankcase is modified version of R2101, cylinder/piston is new design: 5 scavenging ports + 3 exhaust port, the crankshaft is also newly designed: double counter weight made of Phosphor bronze for better torque, of course the crankshaft is DLC coated to minimize mechanical friction and with silicon filler for light weight. The carburetor is also new design, 22E(B)GT double adjustment type carburetor for smooth and better response from cornering with a 7.0mm restrictor, which conform to IFMAR regulation. The cooling head is designed to optimize heat dissipation and light weight.

Video Overview


Piston & Cylinder
Piston & Cylinder

5-scavenging port + 3 exhaust port design is conforming to IFMAR regulation



DLC coated, Silicon filler, double counter weights for powerful torque and response



New carburetor 22E(B)GT: Double adjust type, smooth acceleration from cornering


Product Specs

Product Height
Bottom/Mounting Tabs to top of Cylinder Head 3.4" (86.5mm)
RPM Range
4,000 - 42,000
Cylinder Type
Five Scavenging Ports, three Exhaust Ports
Engine (Only) Weight
13.2oz (369g)
Muffler Type
Tuned Muffler
0.213 cu in (3.49cc)
Oil Type & Content
12-16% Synthetic Oil Mixture in Fuel
Product Length
Backplate to Front Bearing, 2.5" (64.6mm)
0.633" (16.08mm)
Crankshaft Type
Power Type
Plug Type
RP6 Turbo Type, Medium Heat Range
0.677" (17.20mm)
Crankshaft Threads
UNF 1/4-28
Product Width
At Mounting Tabs 1.8" (45mm),