Valve Lash - Tappet Selection - Polaris ACE 900 2017 Service Manual

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:
The Valve Lash Specification and Measured Valve lash must be calculated in millimeters (mm)
1. Subtract the actual valve lash on the engine from the valve lash specification (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).
440 450
442 452
445 455
448 458
3.92
IMPORTANT
Available Tappets
460 470 480
462 472 482
465 475 485
468 478 488
490 500 510
492 502 512
495 505 515
498 508 518
9929422 R02 - 2017-2019 ACE 900 Service Manual
520 530 540
522 532 542
525 535 545
528 538
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