cylinder mix2  cylinder mix

JSR manufactures a full line of high-performance big bore cylinders made in U.S.A. All of our cylinders have reinforced ribbed skirts and cylinder walls to specifically handle nitrous & stroker motors.

'04-05' TRX450 – 99mm Bore, 101mm bore standard and tall deck height available'06 - up TRX450 – 101mm Bore standard and tall deck height available'02-08' CRF450 – 101mm Bore, standard and tall deck available

LTR450 – 100mm standard deck height available

'04-08' - YFZ450 – 98mm, standard and tall deck height available'04-08' – YFZ450 – 100mm, standard and tall deck height available'09-11' – YFZ450 – 98mm, standard and tall deck height available, 100mm Coming Soon!Raptor, Rhino, Grizzly – 105.5mm standard deck height available

We also offer Banshee & TRX250R big bore cylinders from CP Industries


exhaust 1 small exhaust 2 small

JSR offers a full line of high-performace exhaust systems made in U.S.A:

'04 -'11 TRX450 - N-Frame & Drag Pipes'04 -'11 YFZ/YFZR450 - N-Frame & Drag Pipes

ALL YRS. Raptor250 - N-Frame PipeALL YRS. Raptor700 - N-Frame & Dual Drag Pipes

ALL YRS. KFX450 - N- Frame

ALL YRS. LTR450 - N-Frame Undertail Pipe

ALL YRS. RAZR900 - 2 Slip-on Systems

All pipes listed above are available in 9" or 12", including big core silencers. Standard spark arrestors & quiet cores also available. All of our pipes have a LIFETIME WARRANTY. Short of misinstallation or crashing. We will repair or replace for free.


intake 1 radiator small

We are a full service engine shop. With 50 years of combined engine building experience, and certified mechanics in-house, we can take care of all our customers needs to the highest industry standards. For the past 15 years we have been a leader in high-tech solutions, from designing and manufacturing our own line of cylinders & pipes, including at the forefront of alternative fuel solutions such as E-85!

• We can weld, install guides & seats, including save most damaged heads
• We repair damaged cylinders (resleeve & renickelseal)
• We custom build motors from 2 stroke to 4 stroke, dirt bikes, ATV's, Side x Sides, including watercraft
• We offer basic tuning to over-ride transmissions