Description
The black Thermo-Bob 3 CR4D kit adds thermostatic coolant control to Honda CRF450R and CRF450RX models from 2021 to 2025. These models have no factory thermostatic control. The bypass system keeps coolant circulating through the engine while restricting flow through the radiators until the engine reaches operating temperature.
When used as a snowbike, more consistent coolant temperatures help reduce prolonged warm-up enrichment from the EFI system.
Features
- Machined aluminum Thermo-Bob 3 housing in black
- Included 180°F (82°C) thermostat
- Bypass coolant circulation for controlled engine warm-up
- Threaded port accepts compatible KOSO or Trail Tech 1/8-28 BSPP temperature sending units
- Kit includes Thermo-Bob 3 housing, bypass tee with hose barb, bypass hose and clamps
- Manufacturer kit code: CR4D
- 1st Track SKU: TB3-CR4D
Fitment
| Make | Model | Years |
|---|---|---|
| Honda | CRF450R | 2021–2025 |
| Honda | CRF450RX | 2021–2025 |