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Manuals & SupportPremium power, entry-level ease.
Club racers rejoice! The R21 engine delivers an unbeatable blend of power and value for 1/8 on-road racing. Its crankshaft and piston/liner are designed with premium performance and easy maintenance in mind, which makes it an ideal choice for beginners. Best of all, they can be upgraded with O.S. Speed parts when you want to step up to Spec-class competition. High performance. Low price. That’s what you can expect from the R21, only from O.S.
- The perfect power plant for rookies and club racers!
- Upgradable, newly developed crankshaft and piston/liner lets you transform the R21 into a Spec-class performer.
- RP7 Turbo glow plug.
- 8.5 mm carb reducer.
- Speed flywheel collet.
- Exhaust seal ring.
- Dust cap set.
Product Specifications
Specs
| Bore | 0.64 in (16.3 mm) |
| Crankshaft Threads | UNF1/4-28 |
| Cylinders | Single |
| Displacement | 0.213 cu in (3.49 cc) |
| Power Type | Glow |
| HP | 2.75 PS 2.71 HP @ 32,000 rpm |
| Plug Type | Turbo RP7 glow plug |
| Product Height | 3.6 in (91.2mm) from backplate to front bearing |
| Product Length | 2.5" (64.5 mm) |
| Product Width | 1.8 in (45 mm) at mounting tabs |
| RPM Range | 4,000 - 44,000 rpm |
| Stroke | 0.67 in (17.2 mm) |
| Total Weight | 12.35 oz (350 g) |
Club Points Information
Horizon Hobby RC Club:
The points displayed are points you will earn based on your membership level and the cost value of the product. Be sure you are Signed In to your account to see the most accurate points you will earn on your purchase.
|
Points per $1 Spent |
Standard |
Pro |
Legend |
|
10 |
12.5 |
15 |
2000 points = $5 Discount
Points displayed here do not include Bonus Points for select product. If the product is marked with the Bonus Points badge you will also earn the extra "Bonus Points" points listed in the banner in addition to the calculated points displayed
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