Feb 17, 2011 · There isn't a "fuel screw" on a two-stroke. The YZ105 is not just a big-bore, it's also stroked. That's a great set-up, but notoriously difficult to jet, they tend to be very finicky. …

May 18, 2005 · I plan to build a YZ105 from my son's current stock bore 2003 YZ85. He's running a VForce3 reed valve and FMF Factory Fatty pipe which will stay with the big bore.

May 29, 2006 · In fact leaner jetting may be required due to increased venturi signal. The KX100 actually uses a smaller main jet than a KX85 and the next leaner Kawasaki leaner needle. …

Dec 24, 2018 · I recently bought a Athena 105 big bore kit. After installing it (and honing the case out before install) I had a lot of smoke at first when it warmed up (no weird sounds thankfully) …

Apr 25, 2006 · YZ 103.5cc big bore Super Mini - Add $300 to package 2 or 3 price.

Nov 23, 2012 · Athena's Big Bore kit brings the raw power you have been missing in an easy to install, reliable package that bolts on with no machining needed in most cases, and includes …

Unleash Beast Mode Power with a 105cc Big Bore Kit. This 52.50mm big bore kit pumps your YZ85 up to a potent 105cc for absolutely epic power gains. The premium Nikasil coated …

Transform your YZ85 into a YZ105 for the supermini class with this big bore kit from Athena. Kit includes all items you need for the upgrade including cylinder, head, piston and gaskets.

Sep 21, 2023 · All Activity Home Forums Dirt Bikes Make / Model Specific Yamaha Motorcycles Yamaha 2 Stroke Yz105 kit questions

Nov 29, 2022 · This item: Big Bore 105cc Cylinder Kit Yamaha YZ85 2019-2023. Some of these items ship sooner than the others. All the cylinders are entirely engineered in Italy by Athena’s …