A post collecting information on popular modifications to the Yamaha YZF R125 may do a post on each time and money allowing. Im not a big fan of wasting lots of money for little return but your opinion may differ.
Yamaha YZF R125 EGR delete
EGR system is fitted to reduce emmision by circling exhaust gases into you inlet system to reduce temperature of the combustion chamber. Obviously this is going to have an effect of the combustion and the power.
Yamaha YZF R125 air valve mod
The air valve is a reed valve when the exhaust go negative it sucks in air from the air valve and this helps burn off any unburned gases.
Yamaha YZF R125 Air box mod
Theory here is more air in more, more air available for combustion , more exhaust out and more power,
Yamaha YZF R125 Air filter ( sports )
Same as sbove less restriction for air equal more air for engine and in theory more power.
Yamaha YZF R125 Sports exhaust
As above the moving air through the engine more efficiently adding more power , and noise. although an exhaust baffle has been shown to improve things on sports exhausts.
Yamaha YZF R125 Sprockets
Increase top or bottom end by adjusting sizing of sprockets.
Yamaha YZF R125 Power commander ~ O2 sensor
Finer control of fuel injection and custom fuel maps more fuel at the correct time equals more power.
Yamaha YZF R125 Big bore kit and Injector upgrade
Increase bore size more power, increase injector size more fuel, therer are different size injectors for differing bore size increases.
Yamaha YZF R125 after market shock ( adjustable )
Increase handling and steering buy adjusting you suspension to suit your riding style
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