33M777-1506-B1 Husqvarna RZ 4621 RZ4621 966659101 33m7771506b1

    GENERAL DISCLAIMER - PLEASE READ! The following engines on this page have some similar specifications as your HUSQVARNA RZ 4621's engine.

Although any of these engines may not be exactly (100%) the same as for your HUSQVARNA RZ 4621's engine , we feel very confident and are doing our best from our many years of experience to show you the closest engines we have in stock that have some similar specifications as your original engine, such as crankshaft diameter and length and mounting bolt pattern that may work for your equipment. Your exact original engine may not be available because it may: be too old to be in production or discontinued due to some EPA regulations.

Our customers may had bought any of these engines from us and may had done some modifications to adapt to work with their equipment including, but not limited to: transferring the wire harnesses from their old engines to the new engines, tappering the mounting holes, drilling new mounting holes on mower's decks, cutting and welding mufflers, ...etc.

Although we spent a lot of time to prepare, review and compose this page, the information here may not be 100% accurate as we collected them from our experience and from our customers on the daily basis. You should replace your old engine with the same brand, type, and series, specifications to avoid major modifications. Please contact us first if you have any questions or want to confirm before purchasing. We are here to help!
OUR POSSIBLE REPLACEMENT ENGINES FOR

HUSQVARNA RZ 4621 with: Product# 966659101 and BRIGGS & STRATTON
33M777-1506-B1
(33M777-1506 or 33M7771506 or 33M7771506B1)


Our engines on this page have the following similarities. Choose the engine HP and the displacement (cc) accordingly to fit your needs:
    1. Bolt pattern - The mounting hole pattern are the same.
    2. The dimmension.
    3. Muffler configuration is the same (you can reuse your old muffler)
    4. Although spent a lot of time to carefully study about your engine, prepare, review, and compose this page to believe that your engine crankshaft size is 1" diameter x 3 5/32" length, it is still your responsibility to measure your engine crankshaft to double check if it is the same.

Other minor things that you may have to do when you buy the long block to replace your engine including but not limited to: transfer your wire harness from your old engine to the new one if it is not the same (most of these have similar wire harness though), tap/thread the mounting holes (as most of brand new engines did not have the mounting holes threaded/tapped by the manufacturer) etc..

YOUR EQUIPMENT BRAND & MODEL#
YOUR ENGINE BRAND, MODEL, SPEC/TYPE #
OUR POSSIBLE REPLACEMENT ENGINES
(If you matched your equipment's information on the left, buy one of the following engines )
HUSQVARNA

RZ4621
(RZ 4621)
Make sure your mower has ALL of the following information or CALL us!
BRIGGS & AND STRATTON  540cc ENGINE

33M777-1506-B1
(33M777-1506 or 33M7771506 or 33M7771506B1)

and this PRODUCT NUMBER may be found under the mower's seat:

966659101





 BRIGGS AND STRATTON Single Cylinder Intek OHV.

As always, if in doubt or the information here is not correct, please contact us FIRST. Your current engine on your mower may looks similar to one of the Reference Pictures below. reference picture

If you believe more or less Horse Power (HP) CC or Gross Torque than your current engine will be fine with your mower, you can buy any of the engine in this box. Please choose HP, CC, and Gross Torque and engine choke style accordingly.
Reference PicturesAvailable engines
reference picture
click to buy
15.5 (Gross) HP, 500 cc 31R7070041B5500CC155GHP-ENGINE

CLICK TO BUY $829.95 ON SALE    FREE SHIPPING.
reference picture
click to buy
19 (Gross) HP, 540 cc 33S8770043G1540CC19GHP

CLICK TO BUY $998.95   FREE SHIPPING.
reference picture
click to buy
17.5 (Gross) HP, 500 cc 31R9770027G1CC0001

CLICK TO BUY $949.0   FREE SHIPPING.