Yamaha LC 135 Racing Engine Block 58.5mm
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Racing engine block is an oversize diameter of the piston and must be able to contain extreme heat and pressure inside it. This racing engine block for Yamaha LC135/Sniper/X1R is made from Taiwan. The durability of if is known and able to sustain long distance and endurance from the biker.
This racing engine block kit consist of engine block, piston, piston ring and piston pin.
There are two sizes available for the engine block that is 58.5mm and 60.0mm. The standard size of the Yamaha LC135 engine block is 54mm.
Oversize block gives more fuel to burn inside the combustion chamber, thus giving more power. Also, heat is generate more than standard condition with standard engine block. This one doesn’t give any problem to the LC135 since it is liquid cooled.
Tuning of carburetor is also essential when you change the engine block. What is needed to be tuned is the main jet and pilot jet only. Standard main jet for Yamaha LC135 is 105 and pilot jet 20.0. So, what you need to do is to change that main jet and pilot jet to a bigger size. Main jet upgrade size is available in 110, 115, 120 and 125. Changing to the maximum size is not always the best idea. Try 110 first, then upgrade to larger size until you get a good speed all around and smooth running engine. If not, your carb is going to be too rich or too lean with fuel. Pilot jet upgrade comes in size 22.5 and 25.0. Also, try the small one first until you get the best mix. Tuning carb is essential to get the most efficient fuel delivery to the engine block combustion chamber.
After that, you also need to change your exhaust to high performance exhaust to get a better airflow of the exhaust gas. AHM, YY Pang etc is a good exhaust to choose from.
Thanks for reading and happy tuning!