What do power valves look like in Motosport?
The cylinder houses the power valves which look a bit like airplane flaps (see diagram). You’ll need to remove the bolts to extract the valves. But check your service manual before removal. Some valves only install a certain way so jot down notes and/or take photos as you remove and disassemble.
What causes a sticky valve on a bike?
A sticky valve takes longer to open or close making the bike hard to ride. Running too rich for long periods, using crappy gas or low quality premix prevents a clean burn and eventually carbon residue and oil muck up the valves thereby narrowing the exhaust port and/or inhibiting the valve opening action.
Can you adjust the power valve on a Honda Accord?
You can adjust most power valves for lower or high-end speed but not all manufacturers use the same method. KTM uses a tensioner and spring contraption while Honda uses a cable operated system. Adjusting the valve enables you to increase power on the bottom or top end depending on your preference.
What happens when power valve is clogged on bike?
Several scenarios result in clogged or sticky valves giving you a slight idea of what it was like to race in the 70s with a diminished power band but mostly just frustrate the heck out of you. A sticky valve takes longer to open or close making the bike hard to ride.
Are there any problems with the Yamaha YZ125?
Another unique problem that the stock YZ125 has is the way it has a flat top piston with a large bevel on the side. This makes conventional head designs not pair well with it. Normally one would have to choose an angle to match either the bevel part, or the flat part which leads to a compromise in how the squished gasses are dealt with.
Which is the best insert for Yamaha YZ125?
Apex SX/XC insert has the highest compression, slightly higher than stock and has the highest msv that we’d advise running. This gives broad snappy power and a boost in power throughout the entire front side of the power curve.
How old is Aden on a Yamaha YZ125?
My 14 year old son Aden has been going back and forth between two different colored 125’s, but has seemed to take a liking to the YZ125 the most lately. I decided see which simple mods could help this Yamaha YZ125 two stroke the most in order to get him some extra ponies.
What kind of Silencer does a Yamaha YZ125 use?
The YZ125 runs much cleaner with the FMF pipe/silencer (compared to stock) and looks stealthy as the silencer is hidden behind the number plate. I like that the FMF pipe comes with o-rings already installed and is ready to put on.