Original Yamaha 135LC Big Valve Head (Intake: 23.19mm, Exhaust: 20.13mm)

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Original Yamaha 135LC Big Valve Head (Intake: 23.19mm, Exhaust: 20.13mm)

yamaha-135lc-big-valve-head-ori-13 — Yamaha 135LC Big Valve Head Original

Using big valve means allowing for more air and fuel mixture to enter the combustion cylinder for more power delivered to the crankshaft. As usual, any modification that relates to increasing the power (hp) of the bike will increase the fuel usage.

This original Yamaha 135LC head is coated with copper. Why? This copper coating comes stock from the factory. It is used to make the slip much more heat resistant and also scratch resistant. When the valve got bigger the stock slip become much more thinner, so copper need to be adhered to the valve seat for protection against heat and scratch.

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26 more pictures after the jump

All of these images are courtesy of syark86. Find him here

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Keshy Dhillon

Co-founder of Bikes Republic and a motoring journalist by night. He is a self described enthusiasts with a passion for speed but instead rides a Harley and a J300. A man of contradictions, he is just as passionate about time off in the quiets as he is about trail braking into turn one at Sepang Circuit on two or four wheels.