ZHEJIANG KAYO MOTOR CO., LTD.
www.kayomoto.com
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abnormal noise
sprocket wear
Timing chain
stretched
The timing chain
automatic tensioner
fails, or the guide
wheel is worn
Check whether the
driving gear and the
driven gear produce
abnormal noise
Abnormal noise in the
driving and driven
gears
Gear machining
accuracy is not enough
The gear teeth are
worn
The matching
clearance between the
driving and driven
gears is too small or
too large
SELECTION AND RATIO OF ENGINE OIL
In the process of engine work, the oil has the functions of lubrication, cooling, cleaning, rust
prevention, sealing and noise reduction. Compared with the four-stroke engine oil that only
lubricates and does not participate in the combustion, the two-stroke engine oil needs to be mixed
with gasoline and then be used as fuel. So, the fuel of two-stroke engine is also required to play a
lubricating role while participating in combustion.
The difference between two-stroke engine oil and four-stroke engine oil is as follows:
Item
Two-stroke engine oil
Four-stroke engine oil
Flash point [1]
low, flammable
high, flash point >200℃
Thinner
Yes
No
Viscosity
Low
high, the viscosity is 40, 50 or
60
Compounding agent
without ZDDP [2]
with ZDDP
Viscosity index improver
Low molecular weight PIB [3]
High molecular weight PIB
Ash [4]
Low
High
[1] Flash point: Flash is kind of fleeting flashing phenomenon. It is occurred when flammable gas,
which is mixed gas of vapor produced on the surface and air, encounters a fire. The flash point is the
lowest temperature of flash.
[2] ZDDP: Abbreviation for Zinc Dialkyl Dithiophosphates, which is an antioxidant and
anticorrosive agent in lubricating oil additives, that is, a multifunctional agent. Adding this series of
additives to oil can control the oxidation of oil, and has anti-oxidation, anti-wear and anti-corrosion
effects.
[3] PIB: Abbreviation for Polyisobutylene, used as a thickener, and used with other materials to
improve adhesion, flexibility, aging resistance, air tightness and electrical insulation.
