The 2021 MotoAmerica Twins Championship season was the 4th season of the Twins Cup class in MotoAmerica competition.
| Round | Circuit | Date | Race 1 Winner | Race 2 Winner |
|---|---|---|---|---|
| 1 | | April 30–May 2 | | |
| 2 | | May 21–23 | | |
| 3 | | June 11–13 | | (No event) |
| 4 | | June 25–27 | | |
| 5 | | July 9–11 | | (No event) |
| 6 | | July 30–August 1 | | |
| 7 | | August 13–15 | | (No event) |
| 8 | | September 10–12 | | (No event) |
| 9 | | September 17–19 | | (No event) |
[2] [3] [4] [5] [6] [7] [8] [9] [10]
| 2021 Entry List | ||||
|---|---|---|---|---|
| Team | Constructor | No. | Rider | Rounds |
| 419 Racing | Suzuki | 728 | | 7 |
| 626 Pack | Suzuki | 626 | | 3, 7, 9 |
| Adopt A Pet | Suzuki | 377 | | 1, 2, 3 |
| BARTCON Racing | Aprilia | 516 | | 4–8 |
| Yamaha | 270 | | 1–6, 8, 9 | |
| Bays Racing | Suzuki | 621 | | 1, 2, 9 |
| Blue Line Racing | Suzuki | 416 | | 6 |
| Calishine Racing | Suzuki | 204 | | 1, 3–9 |
| CarbonSmith | Aprilia | 934 | | 9 |
| Catalyst Reaction Racing | Suzuki | 147 | | 5 |
| Catalyst Reaction Suspension/Rattler's Rock | Suzuki | 215 | | 5 |
| Champ Racing | Suzuki | 98 | | 6 |
| Chiefs Racing Team | Suzuki | 676 | | 7 |
| 996 | | 2, 7, 9 | ||
| F'Cancer Racing | Suzuki | 959 | | 6, 7 |
| Feel Like A Pro/RiderzLaw Racing | Yamaha | 111 | | 5 |
| First XV Racing | Suzuki | 75 | | 1–5 |
| Fisk Brothers Racing | Yamaha | 112 | | 3, 6 |
| GCP | Suzuki | 128 | | 1–7, 9 |
| GDR Racing | Suzuki | 230 | | 2 |
| Hart Luck Racing | Suzuki | 136 | | 1, 2, 4, 5, 9 |
| Hayden Schultz Racing | Yamaha | 49 | | All |
| HeyNow CW Moto Racing | Suzuki | 787 | | All |
| HONOS Racing Team | Yamaha | 71 | | 5 |
| Innovative Motorsports/Mike's Imports | Suzuki | 79 | | All |
| Jackson Blackmon Racing | Yamaha | 18 | | 2–9 |
| JoeyO Racing | Yamaha | 150 | | 1, 7, 8, 9 |
| KingsKamp.com Racing | Yamaha | 23 | | 1, 2, 3, 5 |
| Kruzn1 Racing | Suzuki | 898 | | 3, 6 |
| Limitless Racing | Suzuki | 200 | | 1, 2, 5, 9 |
| LWT Racer | Aprilia | 60 | | 2–4, 7, 8 |
| Martin Racing | Yamaha | 262 | | 9 |
| MRP Motorsports | Aprilia | 173 | | 8 |
| Pure Attitude Racing | Suzuki | 16 | | 1–3, 7–9 |
| 37 | | All | ||
| Redleg Racing | Suzuki | 224 | | 9 |
| Reed 323 Racing | Suzuki | 323 | | 9 |
| Righteous Racing | Aprilia | 717 | | 1, 2, 4–9 |
| Riot Racing | Aprilia | 190 | | 1 |
| Robem Engineering | Aprilia | 27 | | 1, 2, 4–7 |
| 51 | | All | ||
| 58 | | 7–9 | ||
| 70 | | 8, 9 | ||
| Robem Engineering /Plastic Surgery Racing | Aprilia | 532 | | 7, 9 |
| Ruthless Racing Inc | Yamaha | 229 | | 3, 5–9 |
| Sizzle Maniac Racing | Suzuki | 124 | | 1, 3, 7 |
| SP8S Racing | Kawasaki | 138 | | 2, 8 |
| Tarmac Faction | Yamaha | 158 | | 5 |
| Team Biothermal | Aprilia | 227 | | 1–3, 6–9 |
| Team Legacy Racing | Kawasaki | 17 | | 5 |
| Ten Racing | Yamaha | 10 | | 3, 6 |
| Trees Racing | Suzuki | 154 | | 2, 9 |
| Unit F14/Bison | Suzuki | 545 | | 9 |
| Veloce Racing | Aprilia | 28 | | 8, 9 |
| 58 | | 7–9 | ||
| 62 | | 4–8 | ||
| Yamaha | 291 | | 4, 5 | |
| Vestment Realty | Yamaha | 310 | | All |
| VSV Racing | Yamaha | 192 | | 4, 5 |
| Wicked Flower/RiderzLaw Racing | Suzuki | 52 | | All |
| Wrench Motorcycles | Yamaha | 143 | | 5, 6 |
| 219 | | 1–4, 7–9 | ||
| KK47 Racing | Yamaha | 473 | | 9 |
Points are awarded to the top fifteen finishers. A rider has to finish the race to earn points.
| Position | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th | 9th | 10th | 11th | 12th | 13th | 14th | 15th |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Points | 25 | 20 | 16 | 13 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |