MastercraftUSA
Mastercraft® Replacement Motor for Sootmaster 641M, 652M & Blower B650 — 2-Stage Thru-Flow, 850W, 120V AC
OEM replacement motor for Sootmaster 641M, 652M and Blower B650. 2-Stage Thru-Flow, 850W, 120V AC — restores full suction power and performance.
$210
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Mastercraft® Replacement Motor for Sootmaster 641M, 652M & Blower B650 — 2-Stage Thru-Flow, 850W, 120V AC
The Mastercraft® Replacement Motor for Sootmaster 641M, 652M & Blower B650 is a heavy-duty 2-stage Thru-Flow vacuum motor engineered for continuous-duty performance in commercial and industrial cleaning applications. Built on a proven 5.7" frame platform, it delivers up to 142" H₂O sealed vacuum and 146 CFM airflow at 850W, 120V AC. Its Thru-Flow design allows cooling air to pass through the motor for uninterrupted operation, while replaceable brushes ensure extended motor life. This motor is a direct drop-in replacement used in Mastercraft® Sootmaster® 641M, Sootmaster® 652M, and Blower B650 machines.
- OEM Lamb 116311-01 2-stage bypass replacement motor rated at 850 watts and 120 volts for direct field service replacement
- Compatible with Sootmaster 641M, Sootmaster 652M, and Big Red Blower B650 vacuum and blower models
- Direct replacement for the original Lamb motor maintains factory airflow and suction specifications in compatible units
- Drop-in fitment preserves original motor housing alignment and electrical connection points for efficient technician service
- Using genuine Mastercraft OEM Lamb motor ensures factory-matched performance and preserves remaining warranty coverage
- Contact Mastercraft USA with model number and serial number to confirm compatibility before installation
| Part Number | Lamb 116311-01 |
| Type | Replacement Motor — 2-Stage Bypass |
| Watts | 850W |
| Voltage | 120V |
| Stages | 2-Stage Bypass |
| Compatible Models | Sootmaster 641M, Sootmaster 652M, Big Red Blower B650 |
Each Mastercraft® replacement motor is identified by part number and matched to specific vacuum models. The part number is printed on the original motor label and listed in your vacuum's documentation. Use the compatibility information on mastercraftusa.com or contact Mastercraft® support with your vacuum model number to confirm the correct replacement.
Motor replacement on Mastercraft® vacuums is designed to be serviceable with basic tools. However, Mastercraft® recommends having motor replacements performed by a qualified service technician to ensure correct seating, gasket integrity (especially critical on HEPA and pneumatic units), and continued compliance with applicable standards.
Using a genuine Mastercraft® OEM replacement motor does not void your warranty. Installing a third-party motor may void the remaining warranty and, for HEPA-certified units, may invalidate the vacuum's HEPA compliance. Always use Mastercraft®-specified parts for regulated-use equipment.
Mastercraft® stocks replacement motors for all current production vacuum models. Availability for discontinued or legacy models may vary. Contact Mastercraft® USA directly with your part number to confirm current stock and lead times before ordering.
With proper maintenance — clean filters, no overfilling, no liquid pickup in dry-only models — Mastercraft® bypass motors are designed for thousands of operating hours. The most common causes of premature motor failure are clogged filters (motor overheats due to restricted airflow), liquid ingestion in dry-only units, and operation outside the rated voltage specification. Regular filter maintenance is the single most effective way to extend motor life.
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