Powroll general product information

GENERAL INFORMATION ON POWROLL PRODUCTS

Want parts for a specific model? click Products / Services above.

'Race Gas Required' or 'Race Gas Mix Required' means high octane!

Some new fuels designed to get the best power possible from STANDARD compression engines might not be high octane.

Occasionally, you will hear people say oxygenated fuels are the only fuels you should run in a four stroke -- NOT TRUE. You should match the fuel octane to your compression ratio, no matter what 'type' of fuel you use.

This also applies to Aviation Fuel, which is not designed for ATV and Motorcycle applications. Although aviation fuel octane ratings seem high enough for safe use in high compression engines, their rating scale is different.

Rule of Thumb:

If it's OK on premium pump gas - lower octane specialty fuels OK.

If compression is too high for premium pump fuel - DO NOT run ANY lower octane fuels.

If you'd like to learn more about octane, check out our Tech page.

For information about specific companies fuels: Nutec Sunoco (Cam2) Trick VP

Powroll piston kits are listed in one of four ways:

HIGH COMPRESSION PISTON

These are stock sized pistons with a taller dome. This kit will increase compression but not displacement.

REQUIREMENTS: Installs in place of your stock piston. No boring required, but clearances should be checked.

OVERSIZE: Some of our kits have oversizes available, these will be listed below the base kit as "BORE KIT - OVERSIZE FOR ABOVE"

BORE-IN KIT

This kit includes a piston that is larger than stock size, but will bore into the stock cylinder sleeve.

REQUIREMENTS: Your stock cylinder will need to be bored to fit the Powroll piston.

OVERSIZE: Some of our kits have oversizes available, these will be listed below the base kit as "BORE KIT - OVERSIZE FOR ABOVE"

RE-SLEEVE KIT

These kits increase the size of the piston past the maximum reliable limits of the stock sleeve. A larger sleeve is included with the kit.

REQUIREMENTS: Your stock cylinder will need the sleeve removed, the cylinder bored to fit the Powroll sleeve, the Powroll sleeve pressed into the cylinder, and the Powroll sleeve bored to fit the Powroll piston.

OVERSIZE: Some of our kits have oversizes available, these will be listed below the base kit as "BORE KIT - OVERSIZE FOR ABOVE"

RE-SLEEVE KIT REQUIRING CASE MACHINING

These kits require a sleeve (see Re-Sleeve Kit), but the new sleeve is larger than the opening in the cases.

CYLINDER CORES

We do not stock cylinder cores. You will need to provide your own cylinder.

BORING & RESLEEVING

If you provide us with your zip code, we can give you a list of shops in your area that offer these services. Powroll does not offer resleeving, but can bore cylinders for Powroll piston kits on a limited basis.

DOWNLOAD OUR STROKER INFORMATION BOOKLET

Includes complete info about what a stroker is and how to order one.

Powroll stroker cranks are listed in one of three ways:

STROKER

Part# will be all numbers, no letters

The price shown is to do the stroke work on your good stock crank assembly. It does not include ANY parts. If your crank needs a new rod or other parts, it will cost extra.

If your crank is more than 2 years old, expect to need some replacement parts.

STROKER WITH NEW ROD ASSEMBLY

Part# will end in ‘RA’

This price includes the work on your crank, a new rod, pin, and bearing. If other parts (cam sprocket, main bearings, etc) are needed, that will cost extra.

STROKER WITH HEAVY DUTY ROD

Part# will end in ‘R’

This is the stroke work with a stronger rod. Pin, bearing and other parts are not included in this price.

SHIPPING A CRANK TO POWROLL

WHAT IS A STROKED CRANK?

Strokers create more displacement (and generate more torque!) by relocating the crank pin further out on your crankshaft’s flyweights. If you'd like more information on how a stroker works, click here.

Stroke work is done on your good crank assembly. You send us your crank assembly (with all pressed-on parts), we do the work, and send it back to you assembled and ready to install.

CRANK CORES

Powroll does not have crank ‘cores’ in stock. You will need to send in a crankshaft. Turn around is typically 2 weeks, except during busy times, when process time can increase to 4 weeks or more. Call or email us to find out what current turn-around time is.

Fine Balance, Crank Pin Welding, and other Specialized Services

All Powroll strokers are aligned to very exacting specifications (more stringent than most OEM requirements!). Additional services (like fine balance, etc.) may be available as time allows. Cost for these additional services is based on time and materials. Please call us for an estimate.

& HARDFACED ROCKERS

IS YOUR CORE GOOD? CORE CHARGES CORE PARTS LIST SENDING CORE FOR CREDIT

Powroll cams listed in one of the following ways:

BILLET

Made in the USA from all new materials, no core is required when purchasing a Billet camshaft.

Contrary to popular belief, we have found no quality difference between a US-made Billet cam and a US-made hardweld cam. Damage to most camshafts can be traced to oil issues (low oil, no oil, bad oil), incorrect valve springs, or installation issues.

Powroll does not recommend, sell, or install performance camshafts made anywhere but the US.

HARDWELD WITH NO CORE REQUIRED

These camshafts are made by adding material to a stock camshaft, then grinding it to our specifications. They are finished by adding a hardface material to the surface which is thicker and stronger than the stock coating.

HARDWELD WITH CORE CHARGE

Made by adding material to a stock camshaft, then grinding it to our specifications. They are finished by adding a hardface material to the surface which is thicker and stronger than the stock coating. Hardweld Camshaft prices include the core charge.

Your order will include the core charge. We will credit your charge card for the core charge as soon as we receive your good core.

Unsure if your cam core is good? See Requirements below.

HARDFACED ROCKERS

Made by grinding the stock (thin) surface from the rocker lobe, then adding thicker hardfacing and grinding to stock specifications.

Our hardfaced rockers are sold in 2 ways:

1. Set of OEM rockers, hardfaced, with core charge. Your order will include the core charge. We will credit your charge card for the core charge as soon as we receive your good core.

2. Work only. Send in a set of useable rockers and we will do the work and return them to you. Price listed is per rocker, quantity required is also listed.

CAM CORE CHARGES

CORE#	MODEL	PRICE
22733G	HONDA 250X - 300EX	$90.00
22734G	YAMAHA WARRIOR - WOLVERINE	$110.00
22740G	YAMAHA TRX90	$100.00
22745G	HONDA TRX400EX	$170.00
22747G	YAMAHA TTR	$80.00
22749G	YAMAHA RAPTOR 660	$190.00
22753G	YAMAHA TTR	$80.00
22754G	YAMAHA KLX110	$100.00
22756G	HONDA CRF150 - CRF230	$75.00
22760G	KYMCO 250 MONGOOSE	$80.00
22761G	KYMCO 90 MONGOOSE	$45.00
22762G	HONDA TRX450R	$225.00
22763G	YAMAHA RAPTOR 350	$80.00
22767G	KYMCO 300 MONGOOSE	$80.00

GETTING YOUR CORE REFUND

Two Options:

1. Send us your core (with a copy of the Packing List), then we will ship your Powroll part.

-OR-

2. Order the part and pay the core charge When you receive our part, return your core to us, along with a copy of your invoice. We will credit your charge card as soon as your good core is received.

Needed for a full refund on your core:

1. Useable core - include all pressed-on parts (bearings, etc).

2. Copy of your invoice (or a letter with your name, address phone number, and the invoice number).

3. Returned within 30 days.

SENDING CORES TO POWROLL

Remove part from engine (or have a qualified mechanic do it) and take off any bolted-on parts (Timing Sprocket, etc).
Parts included with Powroll camshaft are what you send back with the core. See list below.
Place each part in a plastic bag, then wrap it with bubble wrap or newspaper. Then place the parts in a box FULL of packing material (p-nuts, bubble wrap, foam, newspaper). If you re-use the Powroll box, don't forget to keep your installation instructions and warranty card.
Make a copy of your invoice, or enclose a note listing your name, phone number and Powroll invoice number (or if it's an exchange, note that).
Ship to (don't forget to insure your package)

By US Mail:

POWROLL

PO BOX 920

REDMOND OR 97756

By UPS, Fed Ex, etc.

POWROLL

13840 COMMERCIAL LP.

CROOKED RIVER OR 97760

If your core is acceptable, your charge card will be credited for the core price within 1 week of receipt.

CORE REQUIREMENTS

Is your core serviceable?

Some things that can cause your core to be unserviceable:

- Scoring on the journal areas

- Stripped or Broken Bolt holes

- Journal areas out-of-round

- Excessive Overheating (blueing) of cam or bearings

- Previously modified (Hardweld or Re-Ground) cam (call for more information)

- Aftermarket Billet camshafts cannot be re-worked

GOOD CORE EXAMPLE

The Journal areas, sprocket holder and even the lobes are in perfect, unworn condition. There is no discoloration of the metal from heat, and no stripped bolt holes or broken sprocket holder ears.

EXAMPLES OF BAD CORES

	Hopefully yours doesn't look like this! This photo shows a worst-case scenario. This cam is obviously bad, even to the untrained eye!
	Most bad cam cores aren't that easy to spot. Although this camshaft is in good overall condition, the deep gouge in the backside of the lobe is a problem. Though the top section of cam lobe is re-worked in a Hardweld cam, the underside is left alone. Small imperfections are not a problem here, however, this gouge is too deep to allow the rocker to ride over it smoothly.
	The camshaft in this photo (front) is discolored from excessive heat (see regular cam shown behind it for comparison). Heat like this not only discolors the metal, but actually changes the hardness and strength of the material. This can be caused by low oil, no oil or improper oil. Any metal item in the engine that has changed color will need to be replaced -- including this cam! Cams showing discoloration are not acceptable as a core. NOTE: Some engine parts (rods, crank flyweights, etc) may be heat treated from the factory - these will show color even when new.

ROCKER CORES

If your rockers have a good shaft area (bore where the rocker shaft sits), a good thread area (where tappets thread into), and have not been discolored from excessive heat, they will be useable as cores. Lobe area can be nearly destroyed, and the rockers will still be ok as cores.

If you have any questions, give us a call. Even better, if you have a digital camera, shoot a few photos and email them to us. We'll be happy to evaluate it!

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CAM CORE REQUIRED PARTS

ALL PARTS LISTED ARE REQUIRED FOR CORE CREDIT

*** TS=Timing Sprocket BRGS=Bearings SPKT=Sprocket

CORE # MODEL: PARTS REQUIRED

22601G             OHC EARLY 50,70: BARE CAM
22614G             SL 100/125 CAM AND: LOCATOR PIN, NO BRGS
22680G             XR75 '77/XR80/XR100: BARE CAM
22714G             HONDA 185/200 CAM AND: LOCATOR PIN, NO BRGS
22726G             ATC 350X: BARE CAM
22733G              TRX 250X, 300EX: BARE CAM
22734G              WARRIOR, WOLVERINE: BARE CAM
22740G             TRX90 93-05 CAM AND: BEARINGS & DECOMP
22745G             TRX400EX CAM AND: DECOMPRESSOR, SPROCKET HOLDER
22747G             TTR CAM AND: BEARINGS
22749G             YAM 660 RAPTOR CAM AND: DECOMPRESSOR HOLDER PARTS: ROD, LOCATOR PIN, SPRING & DOWEL.
22754G             KLX110 CAM AND: BEARINGS
22756G             CRF150/230 CAM AND: BEARINGS & TS HOLDER
22760G             KYMCO 250 CAM AND: BEARINGS & TS
22761G             KYMCO 90 CAM AND: BRGS & TS
22762G             TRX450R 04-05 CAM AND: 1 BRG & SPKT HOLDER
22763G              YAM 350 RAPTOR CAM AND: BUSHING
22767G             KYMCO 300 CAM AND: BEARINGS, DECOMPRESSOR, TS
22768G             TRX90 06> CAM AND: BEARINGS