BEST BUY OPTIONS! – TRANSOCEANIC FAST-TRACK SERVICE
$495 USD= 333 Euros, 240 Pounds Sterling, 490 Canadian

We offer a FAST-TRACK SERVICE for customers living in Canada, Europe, Scandanavia, and Australasia. Plus we offer fast return on your new 144 kit with 4-day Global Express Mail service for the flat rate of only $50! We know how to handle the customs documentation so the taxman doesn’t overcharge you. Plus we offer discreet invoices emailed to you, and we can invoice your business or sponsors for tax advantages. We offer payment methods of Visa/Mastercard, bank wirements, and Paypal.

Also, there are no external markings, engravings, or embossments on our 144 cylinders, just a serial number that entitles you to a 1-year warranty on the Nickel-Composite plating. With the US Dollar at an all-time low against the Euro and the British Pound, this is a deal that you can’t get in Europe!

Technical Notes: You can send a clean top end to us but not a complete engine by airmail. We supply photos and instructions for grinding the crankcases on Suzuki and Yamaha motorcycles. If you’re a race mechanic or engine builder/tuner and handy with a lathe and hand-grinders we’ll give you specs for those parts and all you need to do is send the bare cylinder. The price for cylinder boring, porting, and Nickel-Composite plating is only $300 Please include a completed copy of the International Service Order Form with your parts, and use airmail for the fastest turnaround time.

GO-JET-SET-GO!

International Fast-Track Service Form
Print this form from your web browser

Instructions for RM/YZ 100/144 Case Mods
See what’s involved with case mods for big bore piston kits

COMPLETE KITS – WHATS INCLUDED?
Parts, Labor, and Return Air Mail

Our kits include everything you need including the piston kit, alignment pins, top end gaskets and bearing. Our big bore service includes boring, porting, cylinder head mods, Nickel-Composite plating, powervalve and crankcase mods plus re-assembly on applicable models. Also we take the time to re-machine any damaged gasket surfaces, Tig-weld casting or inherent design flaws, and inspect and polish the powervalves all as part of the basic big bore package price. If any of the powervalve parts need replacement, we’ll source them for competitive mail-order prices.

SUPERMINI MODEL CHART $400
Honda
CR80/85 1986-2007 $400
Kawasaki
KX65 to 85cc 2000-08 $400
KX80/85 1991-2008 $400
Suzuki
RM85 2002-2008 $400
Yamaha
YZ80/85 1993-2008 $400

BIG BORE MODEL CHART $495
Honda
CR125 1989-1999 134, 139, 144cc $495
CR125 2000-2004 134 & 139cc $495
CR125 2005-07 134, 139, & 144cc $495
Kawasaki
KX125 1994-2008 134 & 144cc $495
Suzuki
RM125 1990-2008 134 & 144cc $495
Yamaha
YZ125 1994-2008 134, 139 $475, & 144cc $495
GasGas
125 MX,XC 2000-2008 134, 139, & 144cc $495
Husqvarna
CR/WR125 2000-2008 134, & 144cc $495
TM125
1998-08 144cc $495

How to Choose the Best Powerband For Your Riding Needs

Porting is included with every big bore kit and powervalve and head modifications must be performed for piston clearance. We offer two basic options; more low to mid and more mid to top end. Big bores make more low-end power just because of displacement. Choosing more mid to top end gives a wider powerband overall. The more low-end option works great for heavier riders, off-road, stadium mx, and it’s the #1 choice of female riders because it gives a 125 a similar powerband to a 4-stroke. The best part is we offer free updates to the porting for two years and we’ll inspect and diamond hone the cylinder too.

Production dirt bikes are designed to burn race gas with octane of at least 98MON. We offer you the choice of race gas or pump gas, however in choosing pump gas we lower the compression ratio below stock and you will sacrifice a bit of potential but overall it’s still better than a stock sized engine. For riders who live and ride in the mountains at high altitude, we offer a special head modification to compensate for the lower air density. The Service Order Form has boxes to check for all of these options and you need to print that form from your web browser and send it along with your top end or engine parts.

What Size 125?

In the application chart above you’ll notice that there are as many as three displacement options; 134, 139, and 144cc. The displacement options are based on two factors; piston sizes available from Wiseco and the relative thickness of the cylinder casting and the powervalve design. For example the 2000-04 Honda CR125 can’t be converted to a 144 because the cylinder is very thin above the exhaust port. There are a lot of myths about big bores propagated by the dirt bike magazines, like 139s make more power than a 144. That’s bunk! Another funny myth is that a 144 piston is so heavy that your hands will vibrate off the handlebars and your engine’s crankshaft will shake apart. That’s baloney too! A 144cc piston is only less than 1 ounce heavier than a 124cc piston. The biggest myth in the dirt bike business is that you have to spend $2,000 on a 125 to make it competitive with a 250F.

Who Rides 144s?

Eric Gorr invented the first 144 in 1976 for a customer who was bigger than average but still loved the handling of a 125. Since then 144s have become popular in off-road racing where 125 race with 200s. Pro mx racers used them illegally in 125 Supercross to get into the main event. In recent years the greatest demand is from 125 2-stroke racers trying to equalize against the 250F advantage.

Catalog Parts Not Custom! Cheap and Easy Everywhere.

We build kits using AMA approved Wiseco piston kits, which are available from Forward Motion, Wiseco dealers, Parts Unlimited dealers, or virtually any mail order motorcycle company. These are catalog commodity parts, not high priced frequently back-ordered custom pistons like our competitors use. Also our kits use stock or aftermarket replacement kits on the models that use head o-rings. Models like the Honda CRs and Kawasaki KXs use steel head gaskets and companies like Cometic and Moose Racing make oversized gaskets for the same price as stock. Our competitors use expensive spacer plates so you’re stuck buying replacements from them.

Warranty?

Although no new dirt bike comes with a warranty, Forward Motion has a liberal policy regarding top end failures and warranties. However all the damaged parts and sometimes the engine must be submitted for evaluation. FM developed a special program for people with our big bores that had problems beyond the scope of a normal warranty. The “Warranty Special” covers everything from normal wear and tear to dirt scratches from not oiling your filter, piston-seizure from not pre-mixing oil with the fuel, too-lean jetting, crashing, overheating from failed cooling systems, broken studs, cracks, powervalve breakage, and connecting rod failure. The cost is only $125 to repair the bore and you don’t even have to disassemble the powervalves. In fact we insist that you send us the complete top end so we can help you determine the root cause of the engine failure to fix it right the first time and save you money. We also offer free diamond honing ($25 value) of supermini and 144 cylinders for two years after you buy it. Nickel-Composite cylinder plating is so tough that in many cases, even when the piston seizes, we can clean it up with just honing!

NEW 144CC KITS FOR 2003-07 CR, KX, RM, & YZ

These kits are based on new original parts and fit late model Honda CR125, Kawasaki KX125, Suzuki RM125, and Yamaha YZ125. You will need to swap the studs and other hardware from your top end, and the Suzuki and Yamahas require minor crankcase clearance modifications that can be performed on an assembled engine with the proper masking techniques. Instructions are included. These kits are ideal for people who want to keep their original parts rather than sending their top ends to America for tuning. We’ll sell you the new parts and tuning for less money than our competitors like Max Power, Varner, PR2, and Stan Stephens, Hardcore, and Aptec (UK) charge for just the labor to your parts alone! These cylinders come with a 1-year warranty on the Nickel-Composite cylinder plating. There are no markings or embossments on the cylinders either; they look completely original, unlike the Athena cylinders. For all international orders, we’ll ship them by Global Express Mail free of charge within 4 days, email you the tracking number and the invoice, plus we’ll write the export documents to streamline the process for your country. These are all special order parts that we can process within 10 days. You get to choose customization like cylinder tuning for more mid to top end for mx or more low to mid for enduro or beginner mx plus the type of racing petrol you use. If you want to order a kit, email Eric at ericgorr@hotmail.com Americans and English speaking individuals can just call 1-630-825-5645 6am to 6pm -7 hours GMT.

EMAIL ORDER FORM for NEW 144s
Click here to place an enquiry for purchase details and delivery date.

PRICES FOR ORIGINAL PARTS, TUNING, Nickel-Composite, & PISTON/GASKET KITS

	PART NUMBERS	US$	EUROS
HONDA CR125 2005-07
Cylinder	12120-KSR-730	$350
Head	12201-KSR-730	$75
Valve set	14200-KSR-730	$100
Big Bore Machining & Nickel-Composite		$350
Wiseco 58mm, extra ring, & Gasket kit		$125
Total Price		$995	€690

 

	PART NUMBERS	US$	EUROS
KAWASAKI KX125 2003-08
Cylinder	11005-0026	$350
Head	11001-0013	$75
Valve set	12005-0012,14	$140
Big Bore Machining & Nickel-Composite		$350
Wiseco 58mm, extra ring, & Gasket kit		$125
Total Price		$995	€690

 

	PART NUMBERS	US$	EUROS
SUZUKI RM125 2005-08
Cylinder	11200-36870	$371
Head	11111-36F11	$101
Valve Center	11250-3G6F40	$103
Big Bore Machining & Nickel-Composite		$350
Wiseco 58mm, extra ring, & Gasket kit		$125
Total Price		$1,050	€729

 

	PART NUMBERS	US$	EUROS
YAMAHA YZ125 2005-08
Cylinder	1C3-11311-01-00	$333
Head	1C3-11111-10-00	$92
Valve L	1C3-1131D-00-00	$125
Valve R	1C3-1132D-00-00	$125
Big Bore Machining & Nickel-Composite		$350
Wiseco 58mm, extra ring, & Gasket kit		$125
Total Price		$1,050	€729

 

ATHENA YAMAHA YZ 2005-08 and KAWASAKI KX 2003-08 144 KITS

Eric Gorr performs tuning to the stock Athena 144cc cylinder kits for a gain or more mid to top end power and can supply custom head domes to fit Wiseco flat top pistons or Eric’s inexpensive universal 58mm piston kit. Comes with cylinder, head with changeable domes, powervalves, piston and gaskets for $895

EMAIL ORDER FORM
Click here to place an enquiry for purchase details