Hi guys
today i just had a new valvespring installed.
im planning to install it myself but since i dont have the necessary
tools like valvespring compressor, they i decided to install it through
a yamaha service center.
why did i decided to change valve spring?
based from my experience, our stock t135 valve spring can only
run upto 10,000rpm. beyond that it will have a valve float.
if you have a stock cdi, you wont reach 10,000rpm because
the stock cdi limits its rpm to 9200 only.
but if you have aftermarket cdi like mine i use rextor.
the cdi doesnt have limiter, its your engine thats now the limiter
in this particularly the valve spring.
valve spring will float or they simple call this valve float.
its a status where your valve spring will bounce like a basketball
and cannot do its function properly due to too much rpm.
the stock valve spring just "cannot" take more than 10,000rpm!
beyond 10,000rpm you will hear the famous "krrrrrt" sound in your engine.
it simply says, lower down your throttle or shift to next higher gear.
btw, if you want to see valve float video
so to get rid of that valve float (bouncing ball effect).
you need a stiffer spring designed for our bike.
ive got a TK racing valve spring (yamaha asean cup specs)
You can use any other aftermarket valve spring designed for our bike too
but havent tried others. anyway any aftermarket valvespring will definitely
increase rpm range.