I boosted this Yamaha YZ250F up to a YZ290F with a 6mm big bore kit from Athena!! Monster torque doesn’t even come close to describing the dirt slingin, wheel standin, crazy power this little giant puts down now!! Third gear wheelies with just the flick of a wrist!!
I still recall the first time I met a Genesis motor back in the 90’s. Those five valve configurations really blew me away! The general idea is less mass with equal or more flow equals higher revving and performing engines! Four stroke design and technology has increased at an amazing rate in the last several years. The intense amount of horsepower while maintaining calm, controllable power from 2000 RPM’s and up has made these bikes more fun, frantic and fierce all at the same time. I love my job!!
Athena makes a quality product!
The old piston in the new big bore cylinder.
Shiny and beautiful!!
5 is better than 2.
But cords showing through the tread on your motorcycle tire ain’t!! This particular tire was on a cruiser with a large fender which hid the damage that was about to befall the rider. Can you count the number of plies? Do you see how a bias ply tire is constructed? The cords of nylon criss-cross one another to build strength to the carcass. But once you wear down to the point of having visible cords, it’s time to check up and replace with new rubber. The moral of this story? Maybe you should get down on one knee and have a glance up under your fender to see what kind of tread depth you have left. State Inspection guidelines call for a minimum of 2/32″, and most tires have “wear bars” denoting unsafe tread levels. Or take a penny and place it in the grooves of your tread, if you can see all of Pres Lincoln’s head, it’s time to get them bad boyz replaced…
You can’t drink this Cordial…
This “MAY-POP” was on a different bike, and even though it was clearly visible, the rider pushed it a bit farther than most sane folk would. Once you pass the outer layer of treaded rubber, it wears quite rapidly, because the material between the plies is softer for ease of manufacturing.
2001 Triumph Sprint ST 955i
There is just something fascinating about triples. Half a V6. Raucous exhaust note. Incredible torque. Heart pounding performance. Whether vintage Meriden Triumphs/BSA’s, old Yamaha XS’s, or late model Hinkley Trumpets, they have my complete respect and devotion!