Big Bore Kits & Stroker Engine Kits
for Two-Stroke Honda Motorcycles

This page shows a list of all our big bore and stroker kits for 2-Stroke Honda motorcycles. Kit details and order forms can be accessed from the links on this page or via the "Fast Path" links on the right of every page in this section of our site.
HONDA  
CR90  90cc Big Bore Kit for Honda CR80 & CR85 - Click for Details and Order Form
CR90  90cc "Bolt In" Stroker Kit for Honda CR80 & CR85 - Click for Details and Order Form
CR98  98cc Big Bore Kit for Honda CR80 & CR85 - Click for Details and Order Form
CR105  105cc Big Bore & Stroker Kit for Honda CR80 & CR85 - Click for Details and Order Form
CR134  134cc Big Bore Kit for Honda CR125 - Click for Details and Order Form
CR139  139cc Big Bore for Honda CR125 - Click for Details and Order Form
CR151  151cc Big Bore & Stroker Kit for Honda CR125 - Click for Details and Order Form
CR265  265cc Big Bore Kit for Honda CR250 - Click for Details and Order Form
CR285  285cc Big Bore Kit for Honda CR250 - Click for Details and Order Form
 

 
A special welcome to all RPM's customers.
As of December 1st 2004 Max Power took over all of RPM's two-stroke business. This includes all two-stroke big bores and stroker kits as well as two-stroke cylinder repair and replating.

Max Power also carries all replacement parts for all RPM's (2-stroke) kits. RPM customers please be assured that Max Power will provide the same quality and customer service as you have come to expect over the past 20 years.

Max Power Inc. and RPM's have been building big bore kits and offering cylinder plating and repair for almost a decade. For several years Max Power and RPM's have worked cooperatively and have assisted each other at every opportunity. As Rick would say "we have become very friendly competitors."

Rick Peterson will be working closely with Max Power as a consultant for years to come and will be involved in future development of new kits. He will also be monitoring technical questions that are unique to RPM's kits. Please understand that Rick would not have chosen Max Power if he did not believe that we will take great care of his customers.

Max Power Inc brings you over 100 years of coating technology to their full line of Performance Big Bore Kits. For leisure or for the most demanding off-road racing. When buying a Max Power Big Bore Kit you are purchasing the best in coating technology and workmanship the industry has to offer.

This page explains the options we offer, but if you would prefer to go straight to the kits for your machine, please use the links in the yellow box or fast path links to the right.

THE MAX POWER SERVICE

When you order a big bore kit or stroker motor from Max Power, your cylinder / motor will be completely disassembled, parts inspected for wear and documented. (if items need repair we will contact you first).

After disassembly your original cylinder plating will be removed chemically to expose the aluminum casting. Then your cylinder will be chemically cleansed and precision machined to the specific size required, this includes all necessary port adjustments made to Max Powers' big bore specs for your make and model. Max Power uses a 48 step permanent spec sheet on every big bore cylinder we produce. Individual records are kept on every kit. This assures quality to our customers and assures when you need to order replacement parts you will get the correct parts on time.

Max Power will: Calculate deck height, squish clearance, trapped volume, port timing and compression ratio and list this on your permanent spec sheet.

Your cylinder will be coated with Apticote 2000 nickel / ceramic bore coating offering you the best in oil retention, and heat dissipation giving your motor the edge required for longevity and performance. Your cylinder will then be diamond honed with the latest honing technology, match fit to your new big bore piston.

Cylinder heads are modified to accept the larger displacement; these modifications take in to affect the octane of gasoline you run as well as how you would like the bike to respond. All modifications and CC's are documented on your permanent spec. sheet. If you sent your complete motor to Max Power, our technicians will have checked your squish clearance and compression before shipping.

Our qualified technicians will clean, machine, and re-install your powervalve assembly, timed appropriately. Carburetor jetting and gearing changes are generally necessary for optimum performance. (Our baseline suggestions are printed on your invoice.)

CHOOSE YOUR LEVEL OF PERFORMANCE

We are very pleased to offer our Big Bore Kit customers different levels of performance based on your needs and our Apticote 2000 coating technology:

All Max Power kits are provided with:

  • Apticote 2000 Nickel /Ceramic bore coating
  • Wiseco pro-lite piston kit with piston, ring (s), pin and circlips
  • All necessary gaskets for assembly

Optional: Max Powers' Xtreme coated piston kit, with our Xtreme head coating. This option offers you the best in extra protection for your piston, and provides enhanced combustion with our advanced piston dome and cylinder head coating. (additional $100.00)

Please click on these links for more information on Xtreme pistons and Xtreme heads!!


                                                                                                                                                                                                                                                                         
Fast Path Links

ATTN:
AMA changes
displacement rules! details>>

HONDA
CR90-BB
CR90-STR
CR98
CR105
CR134
CR139
CR151
CR265
CR285

KAWASAKI
KX76
KX82
KX99
KX105
KX134
KX139
KX151
KX265
KX285

SUZUKI
RM76
RM82
RM100
RM105
RM112
RM134
RM139
RM151
RM265

YAMAHA
YZ90
YZ92
YZ98
YZ105
YZ134
YZ139
YZ144
YZ151
YZ167
YZ265
YZ285

 

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  Primary communication points:
  
Telephone: 608 224 2524
Fax:   608 224 0447
Email: techsales@maxpower-engines.com
Web: http://www.maxpower-engines.com
Max Power-RPM’s Inc.
3001 Progress Road
Madison
Wisconsin, 53716, USA
 
Secondary communication point:
Telephone: +44 (0)1452 300800
Fax: +44 (0)1452 500400
Email: aptec@poeton.co.uk
Web: http://www.poetonaptec.co.uk
APTEC Ltd
Southbrook Road
Gloucester
GL4 3DN, UK