Additional performance item #1
Ignition Coil
Ignition systems do one thing, deliver a spark of several thousand volts to the spark plugs at exactly the right time from a six- or 12-volt battery.
Yamaha Yz125 Ignition Coil.
Part Number: 4SS-82310-00
Part combination withAftermarket CDI & NGK Iridium Spark Plug.
*Notes: Air fuel mixture is recommended to set a little bit more rich than normal.
Additional performance item #2
Clutch System
6 Spring clutch housing with stiffer clutch spring is used to gain more grip pressure on the clutch plate for quicker respond on gear shift and faster acceleration.
Using these 6 spring clutch housing with stiffer clutch spring will make gear shifting upward or downward a lot harder to press and the clutch friction plate would be exhausted quicker. It is recommended to use the stock oem clutch spring with these clutch housing.
*Notes: For durability it is recommended to use the stock clutch housing, alternatively we can add stiffer clutch spring for more grip & clutch pressure.
Additional performance item #3
Carburetor
These are some of the jetting size used & shared by other with 57mm cylinder kit on different carburetor size collected on the net. This is a reference to have an idea where to start from, result may vary on individual setup.
Mikuni VM26 Round Carb
Main Jet #155 Pilot Jet #20 |
Mikuni TM26mm Flatslide
Main jet #102.5 Pilot jet #30 |
UMA Racing 28mm
(need more info & update) |
Keihin PE 28mm
Main Jet #110 Pilot Jet #38 |
Keihin PE 28mm
Main Jet #115 Pilot Jet #35 |
Keihin Pwk28 Japan
Main Jet #110 Pilot Jet #37 |
Keihin PE 28 slow jet
#35, 38, 40, 42, 45, 48
Keihin PE 28 main jet
#82, 85, 88, 90, 92, 95, 98, 100, 102, 105, 108, 110, 112, 115, 118, 120, 122
125, 128, 130, 132 135, 138, 140, 142, 145, 148, 150, 152, 155, 158, 160
*Note: To replace the stock carburetor, the TPS sensor must be bypass with some minor modification.
http://www.yamahat135.com/tps-sensor-carb-bypass/#post-296401
Additional performance item #4
Bearings
Planning for an overhaul or for some reason the engine must be taken apart then free flow bearing or high revving bearing is a must for an a optimize performance. For daily use and durability avoid using fiber type bearings.
Bearing List
Crankshaft Left = 6305/C3
Crankshaft Right = 6305/C3
Camshaft = 6001-Z
Camshaft = 6906 /C3
Transmission =6002
Transmission =6202
Transmission =6004
Transmission =6204
Front Wheel Left =6300-Z/MT
Front Wheel Right =6300-Z/MT
Rear Wheel Left =6301-RS1/MT
Rear Wheel Right=6301-Z/MT
Rear Sprocket Drum =6004-Z/C3
Water Pump bearing =6000
Clutch Plate pressure bearing = 6901 (hand clutch version)
SKF Bearing Brochure and Catalog
SKF PDF 1 - Download
SKF PDF 2 - Download
Original source:
http://yamahat135.com/threads/yamaha-lc-bearing-code.9529/
Additional performance item #5
Cylinder Head Valve 22/19
"But I want bigger valves! Mine are too small!" OK, larger valves can help performance and if done right, volumetric efficiency... which helps everything. HP and mileage can both gain from this modification. Even with everything else the same, intake manifold, carburetor (or fuel-injection), cam specs - larger valves make it easier for the engine to breathe. That would require less throttle opening at highway speeds or it can take in more air/fuel mixture at wide open throttle.
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Additional item #6
RPM Gauge Meter
Keep in view item #7
Oversize Big Bore Kit
- 58mm 155cc
- 60mm 166cc
- 61mm 172cc
- 62mm 178cc
- 63mm 183cc
- 65mm 195cc
Two Additional item below for an a 62mm or 63mm Big Bore Kit upgrade.
- Keihin PE 28mm or any other compatible 28mm size carburetor
- Cylinder Head Valve 22/19
*For more item lookup, price survey.
Online Seller One (Facebook)
Online Seller Two (Facebook)
Preference for: yamaha lc135 shark block racing set fz150 x1r racing head
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