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Polaris RZR 900 HP4 VALVE TRAIN Kit
PRODUCT INFORMATION With today's modern ATV 4-Stroke engines, making additional Horsepower is no easy task...This makes it critical that Engine Tuners have the Experience, Knowledge and Equipment to do the job properly.

Duncan Racing International's HP4 Valve Train Kit is designed to give you the utmost in performance and reliability by using the most advanced equipment and techniques in the industry. All porting work is performed by our master technician and valve seat cutting is done on our in-house SERDI valve seat cutting machine..

MODEL: 2011-14 Polaris RZR 900

DRI HP4 PURCHASE OPTIONS
HP4 KITS are OFFERED IN 3 OPTIONS:
1. DR-900K: DR sell Customer all necessary Parts- Customer does own Port Work and Valve Seat Machining-Customer must send in stock camshafts or pay core charge.
2. DR-900KP: DR does all Port/Machine work-supplies Customer with all necessary Parts-Customer must send in stock head and stock camshafts or pay core charge.
3. DR-900KPH: DR Supplies New Head and Camshafts and does all Port/Machine work-plus supplies Customer with all necessary Parts-Customer sends in Nothing

DR-900K - $1795.00 DRI Valve Train HP4 Kit Camshaft Includes: Big Valve Kit (+1mm S/S IN & EX), HP Valve Guides, HD Valve Spring Kit w/Titanium Retainers, HardFaced Camshafts (see cam profile options below)

* Porting / Serdi Valve seat cut not included in this kit.
**Kit must be installed by a trained professional with proper equipment.

DR-900KP - $2495.00 DRI Valve Train HP4 Kit. Includes: DR Head Port, SERDI Valve Seat Machining Big Valve Kit (+1mm S/S IN & EX), HP Valve Guides, HD Valve Spring Kit w/Titanium Retainers, HardFaced Camshaft (see cam profile options below), 8pc HP Valve Lifters

*Customer must send in head for modification or purchase new head from DRI
** Customer must also send in stock cam core. (or pay $175 core charge)

DR-900KPH - $3400.00 DRI Valve Train HP4 Kit Includes: NEW HEAD and NEW Camshafts, DR Head Port, SERDI Valve Seat Machining Big Valve Kit (+1mm S/S IN & EX), HP Valve Guides, HD Valve Spring Kit w/Titanium Retainers, HardFaced Camshaft, 8pc HP Valve Lifters (See Cam profile options below )

CAMSHAFT OPTIONS
Grind #1096293
Lift .385”/.360” Duration 259/248

NOTES: 1, 3,4,5

Contact DR for other camshaft grind options

NOTES:
1. HD Valve Springs are required for this camshaft.
2.Shortened Bronze Guides are required for this camshaft.
3.New or modified piston required for this camshaft. Additional valve pocket relief in piston is required due to increased camshaft lift.
4.Customer must send in stock camshaft core. If no core is supplied, customer must pay core charge of $175.00
5. HP Performance Valve Lifters strongly recommended