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Powroll

13840 Commercial Lp

Crooked River, OR

97760

 

Mail:

PO Box 920

Redmond OR  97756

 

Phone

541-923-1290

 

Fax

541-923-5637

 

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Powroll - 4 Stroke Performance
 
 

 

Powroll products for the Yamaha Raptor and Warrior 350

STOCK SPECIFICATIONS:   

83mm BORE X 64.5mm STROKE 

9.2:1 COMPRESSION

FYI:  In 2004, Yamaha released the Raptor 350.  Utilizing the Warrior engine and chassis, Yamaha did some work on the frame geometry and added goodies like the YFZ450 footpegs to make the new Raptor a better handing and easier riding machine.  All the internal components are essentially the same as the Warrior, with the exception of the camshaft and headpipe.  The Raptor header was designed to increase torque and midrange over the earlier Warrior design.

365cc BORE KIT

#00305

$265.00

 

85mm Piston, 10.5:1 Compression

Nice increases in torque and midrange power

INCLUDES: Piston, pin, rings, circlips, headgasket

REQUIRES: Boring, rejetting

BORE & STROKE 430cc

#00272-16082LR

$680.00


 


86mm Bore, +9.5mm Stroke, 11.5:1 Compression

Excellent torque and great midrange power increases.

INCLUDES: 86mm Cast Piston, pin, rings, circlips, headgasket, sleeve. Work done on your crank.

REQUIRES: Your cylinder and cases will need to be machined. Send in your crank for modification. Download our Stroker Booklet for details. Rejetting, fuel octane 100+. Piston will not work with stock crank.

REBUILD KITS for 430cc

+.050mm

#00272B

$225.00

+1.00mm

#00272D

$225.00

#00272B = 86.5mm, #0272D = 87mm

11.5:1 Compression

INCLUDES: Piston, pin, rings, circlips, headgasket.

REQUIRES: Bores into Powroll sleeve from our 430cc kit listed above. Will not work with stock crank.

CAMSHAFTS - HARDWELD, DONE ON YOUR CORE

TORQUE GRIND - Lift .390” Intake, .390” Exhaust

$150.00


Designed for good torque and excellent midrange when used alone. Paired with our 365cc bore kit, it’s a great torque grind for woods riding.

REQUIRES: Send in your good cam core for work, approx. 4 week turn-around.

NOTE: Yamaha has updated the cam design for this engine 3 times. THE DESIGNS ARE NOT INTERCHANGEABLE. Be sure to select the proper year and model.

MIDRANGE GRIND

Lift .430” Intake, .430” Exhaust

$150.00


Designed for good torque and excellent midrange when paired with a bore kit or bore/stroke combination.

REQUIRES: Valve Springs #24028T. Send in your good cam core for work, approx. 4 week turn-around.

NOTE: Yamaha has updated the cam design for this engine 3 times. THE DESIGNS ARE NOT INTERCHANGEABLE. Be sure to select the proper year and model.

RACE GRIND

Lift .430” Intake, .430” Exhaust

$150.00


The massive duration on this cam makes it a great choice for MX or TT.

Designed to work with our 430 Bore and Stroke combo.

REQUIRES: Valve Springs #24028T. Send in your good cam core for work, approx. 4 week turn-around.

NOTE: Yamaha has updated the cam design for this engine 3 times. THE DESIGNS ARE NOT INTERCHANGEABLE. Be sure to select the proper year and model.

VALVE SPRINGS

#24028T

$110.00


Designed for use with any higher lift camshaft.

INCLUDES: Spring set (inner and outer springs), Titanium

Retainers, Bottom Cups, Heavy Duty Keepers.
 

VALVES -

STAINLESS STEEL

$55.00 each

INTAKE - STANDARD #24520

INTAKE - 1mm OVERSIZE #24520A

EXHAUST - STANDARD #24521


Valves are sold each. You will need to purchase 1 intake and 1 exhaust valve for a complete set.

Increased longevity and better airflow characteristics make these a much better deal than OEM replacements.

CARBURETOR

38mm MIKUNI ROUND SLIDE

#20528

$400.00

Special order, allow 2-3 weeks for delivery.

Pre-Jetted for engines 400cc or larger.

INCLUDES: Throttle Assembly, K&N Filter. Will not work with stock airbox.

EXHAUST
Powroll recommends the White Brothers (Vance & Hines) E Series or Supertrapp IDS2 slip-on mufflers for the Warrior and Raptor 350.

 

 

 

 

Powroll Motor Performance

13840 Commercial Lp  Crooked River, OR  97760     Phone (541) 923-1290    Fax  (541) 923-5637

Copyright © 2010 Powroll Inc.  All rights reserved.  All photos and text are the intellectual property of Powroll and cannot be reproduced without permission.

Descriptions and pricing are subject to change without notice.