Page 244 - Manual_Polaris_RZR_ProXP-20-21

ENGINE / COOLING SYSTEM

VALVE LASH - TAPPET SELECTION
A 440 tappet means the thickness of the tappet is 4.40 mm. Part Number: 5138477-XXX (X’s represent 3 digit tappet
size)
An Engine Valve Lash Adjustment calculator has been created and is located under Service and Warranty – News,
Forms and Links. Click or go to
https://www.polarisdealers.com/files/ServWarr/English/Engine%20Valve%20Adjustment%20Calculator.pdf
The proper valve tappet may also be obtained by completing these steps:

IMPORTANT
The Valve Lash Specification and Measured Valve lash must be calculated in millimeters (mm)

1. Subtract the valve lash specification from the actual valve lash on the engine (i.e. 0.29 mm – 0.20 mm) = 0.09 mm.
2. Divide the 3 digit tappet number by 100 (i.e. 450 / 100) = 4.5 mm.
3. Add the results of step 1 and step 2 (i.e. 0.09 mm + 4.5 mm) = 4.59 mm.
4. Multiply that answer by 100 to obtain the correct new tappet (i.e. 4.59 mm x 100 = 459).
5. Refer to the table below to find the closest available tappet size to the result from step 4 (i.e. 459 should be
rounded to 460 since there is a 460 tappet).

AVAILABLE TAPPETS

440 450 460 470 480 490 500 510 520 530 540
442 452 462 472 482 492 502 512 522 532 542
445 455 465 475 485 495 505 515 525 535 545
448 458 468 478 488 498 508 518 528 538

3.100 9930583 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual
© Copyright Polaris Industries Inc.