RPJ Performance: Motorsports Machine Shop

It's Simple, Mail us your Cylinder, We Mail it back! 

Call or Text Us At  (585) 415-8617  

                              (Business Hrs. Monday - Friday 9am to 5pm)

Cylinder Repair Price Guide (some prices may vary) 
Bore & Hone 4 Stroke Cylinders up to .080 over size (cuts over .080 are considered big bore, Additional charges apply ) $40.00 Pr Hole
** Bore & Hone 2 Stroke Cylinders Includes chamfering ports. ** $45.00 Pr Hole
Bore Harley torque plates used $45.00 Pr Hole
4 Stroke Replace Sleeve Drop In Type Includes Bore & Hone $65.00
4 Stroke to Big Bore or sleeves that have to be cut out $95.00
Sleeve 2 Stroke Non Power valve $95.00
Sleeve 2 Stroke Includes power Valve Service - please send pwr- valve with your cyl.  $125.00
Harley Davidson 883 to 1200 Big Bore $100.00 Pr Hole
Bore Automotive Block Call $
Bore Small Engine Block Kohler Briggs Etc Call $
Bore Marine Block call $
Motocross Special * Sleeve 4 Stroke Cylinder (CRF450 CRF250 YZF450 ETC.) Includes Sleeve & Labor!! $200.00
** Cut Power Valve (Required on some cyls. when boring .040 or over) ** $20.00

Top End Kit Prices:

Includes Wiseco Piston Kit, Top End Gasket Set, Sleeve, Sleeve Installation, Boring, Honing, Powervalve & Stud R&R, Deck Head Gasket Surface and Return Shipping within the US! (wrist bearing not included, add $15)

* 80 85cc Top End Kit price $290.00

* 125cc Top End Kit Price $335.00

* 250cc Top End Kit price $390.00

* 500cc Top End Kit Call For Price

For Models such as Honda CR. Kawasaki KX, Suzuki RM, Yamaha YZ

We also offer competitive priced Bottom End Kits, complete with Crankshaft, Bearings, Seal & Gaskets to go along with the top end kit for a complete rebuild, for Motocross and other Off-Road Bikes & ATV's.

Call or Text for a Quote  today (585) 415-8617 After Hours Service Leave message or text and we will get back to you as soon as possible, Business Hours Mon. - Fri. 9 am to 5 pm.

Email us:  mailto:2strokeking@gmail.com

Business Hours: Monday to Friday 9am to 5pm Eastern.

Location: We are centrally located between Rochester and Buffalo NY.

Payments: We accept major credit /debit cards & Paypal. When work is complete we call and email you an invoice that can be securely paid online, or take payment info over the phone.

Shipping: Cylinders can be mailed in from any State for $10 to $15 using USPS Flat Rate Boxes available Free at your Local Post office. When shipping us your cylinder be sure to include, Make, Model, Year, Your Phone Number, You can also submit an online work order from the "contact us page" Also it is best to send the Power Valves along with the cylinder so we can check fitment after the sleeve is installed.

 

How It is Done, Motorcycle cylinder boring and sleeve installation.
* Cylinder Boring - Motorcycle ATV and Snowmobile cylinders are bored on a special machine designed just for this type of cylinder.  First the cylinder is cleaned and gaskets removed to ensure the cylinder mounts on the boring bar square. The cylinder is measured to determin bore size, then measure the oversize piston to be used, the cylinder is centered and jigged into the boring machine. Using a special instrument the carbide bit is adjusted to the desired cut then secured into the bar. Now the machine does the work until piston size is obtained, leaving aproxamently .002 of an inch for the honing. 

 

Using a bore guage to measure the cylinder is honed with a 45 degree cross hatch pattern until we get the correct piston to cylinder wall clearance. On a two stroke the ports have to be chamfered with special grinders so the rings don't snag the ports.

Angle Die Grinder used to chamfer ports pictured above.

 

* Cylinder Sleeve install - When a plated or sleeved cylinder is damaged or worn beyond spec. a Carbon Steel Sleeve can be installed. 4 stroke sleeves can usually be pressed out but 2 stroke sleeve needs to be cut out.
The cylinder will have an interferance fit of .002 - .004 depending on application, the cylinder has to have a flange cut into the top to match the sleeve, Afer macining the cylinder it is heated in an oven to 400 degrees, this expands the cylinder so the sleeve can be slipped in, there is about a two second time frame to alighn the ports. If the ports are not aligned properly the sleeve will have to be cut out and start all over again. Once the sleeve is in place it has to be held in a press with a couple tons of down pressure to keep the sleeve from moving during cool down time. The sleeve would be set into the cylinder about .002 above the cylinder head gasket surface, so now the head gasket surface has to be decked so it is perfectly flat using a surface grinder or milling machine. Now the ports all willbe cut to match the aluminum cylinder casting using small straight and angle grinders with carbide bits.
Not done yet! back to the boring bar, the sleeved cylinder now needs to have the bore match the piston and honed to size.
* Quality Control - every cylinder is then cleaned in an Ultrasonic cleaning machine, then all guages are recalibrated and the piston to cylinder wall clearance is re-checked befor shipping back to the customer.

Thank You for chosing RPJ Performance for you cylinder boring and machining!!

About Motorcycle Cylinder Repair - Boring & Sleeving.

Specialist in Motorcycle ATV Snowmobile Cylinder Repair. Cylinder Boring, Sleeve Installation, Sleeve Replacement, Honing.

Payment: We accept, PayPal, Master Card, Visa, American Express, Discover, Money order & Cash. 

 

 

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