Yz125 Big Bore Kit

Re chamber to work with the custom wiseco big bore piston.

Yz125 big bore kit.

This was not money well spent. Due to the math of it all when going big bore every time you add bore size your displacement goes up by half the bore size squared. Motorcycle big bore top end kits for 2001 yamaha yz125. Bore port and replate with ceramic nickel bore coating.

No crank mods required. 100 octane suggested for most conditions. This kit requires you to send us your cylinder head and power valves for modification. This means all things being equal.

A wicked fast yz125 big bore stroker. 2002 yamaha yz125 5 out of 5 stars 7 7 product ratings big bore complete cylinder kit athena p400485100030 for yamaha yz125 2005 2014. We strip your stock cylinder weld the ports for perfect port timing then bore the cylinder from 57 5mm to 56mm 134cc. Big bore cylinder packages 450 500.

The yz144 big bore kit does not come with an exhaust pipe so we ordered a 239 95 gytr exhaust pipe and 124 95 silencer to enhance the package. Kelley started riding a honda 50 at the age of 6 years old. It requires you to send us your yz125 engine and we will modify it to a yz167. The 2 stroke revolution is real and our yz144 m spec big bore kits truly make your 2 stroke equal to or better than modern 4 strokes.

To assemble this cylinder kit on models yz 125 lc 1997 1998 you have to replace the original muffler with a version for the year 1999 2003 and for 1997 1999 models you have to order the 2 torsion original springs valve yamaha year 2000 2003 all athena products which are manufactured with higher displacement and power than those permitted by law of the country where the end user. Precision machined to exact specifications. We have built more yz139 s over the years than any other kit we offer. In our opinion it is the perfect bore only displacement available for the yz125.

Big bore complete cylinder kit athena p400485100030 for yamaha yz125 2005 2014 fits. However the port area only goes up linearly. Namura top end rebuild kit yamaha yz125 2001 53 94mm std. The following parts fit a 2001 yamaha yz125 edit go to my garage.

The best value for your money is a top end big bore kit. Re chambered to work with the custom wiseco big bore piston and stroker crank. We can make the biggest difference in performance with the top end because we include porting with our kits with mods to the cylinder head and powervalves to suit your choice of fuel. The 1999 2018 yamaha yz125 134cc 144cc kits are our most popular m spec big bore kits.