What engine does a YZ125 have?
The Yamaha YZ125 is a motocross racing motorcycle with a two-stroke 124.9 cc (7.62 cu in) displacement single-cylinder engine made by Yamaha since 1974. It is available to the public.
How much does a 125 2 stroke rebuild cost?
Approx Prices Guide: 2 Stroke 125cc – approx $699. 2 Stroke 250cc – approx $799.
How do you split a case without a case splitter?
If you do not have a crankcase splitting tool, splitting the cases is possible using a commonly available harmonic balancer puller (available at auto parts stores) along with 2 (long) 6mm x ~150mm bolts and a dead blow hammer.
What kind of engine does a Yamaha YZ125 have?
With its explosive engine power and ultra responsive aluminium chassis, this lightweight 125cc 2-stroke is a proven winner at the highest level.
Are there any cylinder ports on the YZ125?
Cylinder porting is where you can make or break the power-band on a 2 stroke engine. The YZ125 has pretty good ports from the factory, but there’s always room for improvement. If you don’t know what you’re doing, I strong warn you NOT to port the cylinder yourself.
Are there any mods for the YZ125 motocross bike?
I’ve owned several YZ125’s over the years, and there’s a lot of upgrades available for this motocross bike, but they don’t all have the same effect when it comes to an actual improvement. The single best mod for most 2 strokes, including the YZ125, is getting the jetting right.
Why do I need aftermarket cylinder head for YZ125?
An aftermarket cylinder head will give you more torque and better throttle response, as well as make jetting easier. This is done with correcting the squish clearance between the top of the piston and the head. A stock YZ125 has a loose squish tolerance, which is simply due to Yamaha manufacturing it on the “safe” side.
Is the Yamaha YZ125 a two stroke engine?
With Yamaha redesigning the 2015 two-stroke line, some of the styling work was done for us, so we got straight to work on the heart of our YZ125. The engine was disassembled and the top end sent off to Pro Circuit for some massaging by Mitch Payton and his porting tools.
What kind of crank kit for YZ125 engine?
This YZ125 engine received a complete Wiseco bottom and top end, including crank, piston kit, and the necessary gaskets and seals. Wiseco bottom end kits feature cost-effective OEM replacement cranks that go through a rigorous R&D and QC process. Watch the Wiseco crank engineering and QC process here.
What kind of engine is a Wiseco YZ125?
This YZ125 engine was completely rebuilt for reliability and performance. Read more below on the engine mods and internals. This YZ125 engine received a complete Wiseco bottom and top end, including crank, piston kit, and the necessary gaskets and seals.
What kind of hubs does a Yamaha YZ125 have?
Split Designs killed it in the graphics department, and the Talon carbon fiber hubs made people stop in their tracks. With Yamaha redesigning the 2015 two-stroke line, some of the styling work was done for us, so we got straight to work on the heart of our YZ125.