2012年2月23日 · The YZ144 kit includes a brand-new nickel carbide-plated cylinder (with enlarged water passages), cylinder head, 58mm piston with rings, pins, clips, gaskets, modified powervalves, O-rings and ...

2017年10月2日 · The Yamaha YZ144 we built has a much stronger hit over the YZ134, but the powerband is shorter and signs off faster. To make the YZ125 into a YZ144, we utilized a used Athena cylinder that was...

2017年11月15日 · Between the YZ134 and YZ144 BBs, I think the YZ134 is a little more mid-top and the YZ144 is a little more low-mid, but this is just from what I've read. Also, based on what I've read, the YZ144 can be tuned to rip/screen.

2023年8月12日 · The easiest route to making your YZ125 a YZ144 would be to install the Athena big bore kit. It has everything you need, from piston and cylinder, to all the gaskets.

We installed an Athena 144 big-bore kit that included a brand-new nickel-carbide-plated cylinder (with enlarged water passages), cylinder head, 58mm Vertex piston with rings, pins, clips, gaskets, modified power valves, O-rings and complete instructions. Best of all, it fits all 2005–’12 Yamaha YZ125 models.

2016年1月26日 · Athena's yz144 kit tend to have head leak issues. Also the yz125 (at least the 05 up) need the cases trimmed for the crank clearance when doing a big bore. Denn700 wrote: My best friend has not raced since he was 12 years old or ridden an MX bike. He wanted to get back into it at 39... More.

2011年8月17日 · What a timely topic. We are looking into Eric Gores YZ144 kit for offroad racing vs. the Athena kit. I gave him a call last night. Eric was more than willing to answer all of my questions and raised my comfort level dramatically. Probably spent …

2020年5月6日 · Start out with the pilot jet using standard pilot jet jetting methods. Then the needle and followed by the main with plug chop testing. Maybe post what was the stock jetting on that year 125x and then post your current jetting. Include your altitude riding range, average temps, oil ratio, and fuel used.

2006年10月25日 · Build your stock cylinder to 144. Depends on what you are looking for. Eric will custom port it for you. Want low end, or want a rocket he'll make it work. He can also get parts to you quick.

2004年12月3日 · More detailed reports to come later, but in a nutshell my project bike is done and finally got to practice on an indoor mx track. -Eric Gorr 144 engine with more better porting. Pipe/shorty silencer. -187 lbs, all fluids, no gas. I dropped nearly 10 lbs on the lightest bike made.