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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

Email

Powroll piston kits are listed in one of the following ways:

HIGH COMPRESSION PISTON

Standard-sized pistons with a taller dome. Increases compression but not displacement.

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

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

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

REQUIREMENTS: 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.

RE-SLEEVE KIT - REQUIRES CASE MACHINING

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

REQUIREMENTS: Same as Re-Sleeve kit above, plus: Lower end disassembled to allow the case opening to be bored for the larger sleeve.

CYLINDER CORES

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

BORING AND RE-SLEEVING SERVICES

Powroll offers these services, or you can have a qualified local machine shop do the work.

SENDING PARTS TO US

STROKER INFORMATION BOOKLET

Includes ALL our information about stroker cranks; what they are, how they work, how to get one, how to ship parts to us.

SENDING PARTS TO US

WHAT IS A STROKED CRANK?  

Powroll stroker cranks are listed in one of the following 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

All 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. 

SPECIAL SERVICES

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.

IS YOUR CORE GOOD?

SENDING PARTS TO US

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

These camshafts are made by adding material to a stock camshaft's lobes, 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. We typically offer these cams as "Send in your core for work", or "Includes core charge".

SEND IN YOUR CORE FOR WORK

Hardweld cam done on your good stock core. Send in your acceptable camshaft and we will do the rest. Turn around is approximately 3 weeks. Unsure if your cam core is good?  See Requirements here.

INCLUDES CORE CHARGE

You will receive a modified stock camshaft, usually on a new stock core. We do not use Chinese or other aftermarket cores.

HARDFACED ROCKERS

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

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.

SENDING PARTS TO US

'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.