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You are here:Home > TRX 250R 86-89 ATC 85/86 PERFORMANCE PARTS KITS > TECK INFO
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TRX 250R 86-89 ATC 85/86 PERFORANCE PARTS / KITS
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LONG ROD 130.3
LONG ROD 130.3

Here are the manufactures of long rods (130.3) you can identify our crank  long rod cranks require spacer to install our cylinder kits
SHORT ROD 125.3
SHORT ROD 125.3

Here are the manufactures of short rod (125.3 ) short rod do not need a spacer for cylinders kits
PORTING INFO
PORTING INFO

Here is a trx7 310 sleeve and a trx9 310 sleeve most of the power that comes from the  cylinder comes from port design and port timing its not so much from the smoothness( most engine builder dont wont you to know this is how they make money) we c.n.c. the port windows on the machining center to a 7 or a 9 port they will run very good  without porting and poishing because the port timing is done in the machine more accurate than hand porting so we designed the cylinder to need very little porting and we c.n.c machine the port windows we owen all the tooling to do the casting of the cylinder we use a great fondery here in the  u.s.a.  we machine the head and dome here at esr thats why we can offer a great price
310.CEO.P.V.CYLINDER.KIT
310.CEO.P.V.CYLINDER.KIT
Our Price: $980.00

NEW PISTON AND HEAD DESIGN ( race fuel only)

COMES WITH THE FOLLOWING
CYLINDER POWER VALVE
PISTON CEO
HEAD CEO
GASKETS NUTS BOLTS
ONLY ONE PORT AVAILABLE DOES ALL MX OR DRAG
Capturing Efficiency Optimized = CEO
PATENT IS APPLIED FOR # 13523.02 SIERRA IP LAW PC