QUOTE(alexei @ Jun 4 2014, 10:28 AM)
pijuThanks for your contribution to the thread, and detailed update.
I hope others here will benefit from your guide. Post is pinned.
I think BS25 pilot screw is fuel jet. So, the more you open or turn counter-clockwise, the more fuel will be mixed. In other words, reduce air-fuel ratio, making the pilot circuit richer. The amount of air is constant, based on throttle opening. Don't forget, not to mess with air filter for BS25.
Exhaust tuning is a different animal. The size is just a part of it. The tuning involves measuring the port timing, and deciding the 'tune' for each sections of the pipe. A bad exhaust can over draw fresh air through the intake port to the exhaust, or block exhaust gas from exiting the exhaust port...
Smaller tyre is not a measure of performance, think safety first.
Also, suspension and brakes system.
For EO, I will always point you to first page, for the recommended oil link.
In my personal experience, is not to use a viscosity higher than factory recommendation. Imagine this:
- Higher viscosity oil needs high pressure to flow at the same rate than a lower viscosity oil. Since you're not increasing oil pressure, you may cause oil starve in some areas...
- High viscosity oil is harder to go through small clearance gap.
- High viscosity oil does not necessary have higher film strength for surface protection. Oil quality does.
For synthetic vs semi vs mineral in a wet clutch system, you need to point out the source, as I haven't heard of this.
What I know is there should not be friction modifiers, or things like moly additive, which could cause clutch slip.
As for oil treatment, consider this, 4 stroke bike EO works from the engine head to the gearbox. The mechanical stress to the oil is harsher than car. Should you add a car EO additive to your bike?
As for HDEO, it is designed for diesel engines. Diesel engine is high stress low (<6k) RPM engine. As for bike, they run at relatively higher RPM than diesel engines, up to 8k. Based on their design use case, should you use HDEO in a bike?
bro
alexei,
for my personal opinion, moped is not designed to be ride for a long and hard journey. moped is designed to be use for short distance. if we use our moped for a long journey daily, i think we need to use higher viscosity oil or higher grade rather than using what is written on service manual. as long as the oil is for bike, not for car or truck.
i once go to hong leong yamaha at sungai buloh near my work place. i asked the mechanic, what is the best oil for yamaha 135 lc ? he said depends on your purposes. what he mean is, if we ride long and far journey daily, better use fully syntethic and higher viscosity.
i am absolutely not going to use any of car oil treatment on my motocycle. i only use STP which is for motocycle. dont get confuse with my earlier post. oil treatment for motocycle has only low value of zinc dialyldithiophosphate to prevent wear on your engine. car oil treatment has higher value which is not good for motocycle since higher value of it can increase wear. like i already said, the keyword is balance. a more of something can be good but the too much of something doesnt mean good.
about the tyre, i dont recommend any of SOTONG tyre. front 80/90, rear 90/80 is already good for normal usage. what i think the best is, front 80/90 and rear 90/90. but it is too hard to find 90/90 tyre.
HDEO is not suitable for motocycle since it has more zinc dialyldithiophosphate. suitable for heavy duty engine like truck or lorry which running on diesel engine and has no catalytic converter.
btw, bro
alexei.
since yamaha 135 lc has its own oil filtering medium, i installed uma racing bypass valve replacing my oil tank cap to relieve the pressure inside my engine.
as stated on uma racing website,
"This product has many benefits. Firstly, the UMAbreather valve is used to replace the original motor oil tank cap to relieve pressure in the engine. As known, engine oil goes through the filtering medium, so it is important to ensure that the pressure loss in the filter does not exceed. This is why the bypass valve in place. If the pressure is incorrect, then the valve will open automatically, allowing oil to bypass the filtering system and balancing the oil pressures.
By controlling the engine pressures, the bypass valve can help the engine to run longer and work efficiently. In the long run, it significantly prolongs the engine life. On the other hand, it can speed up the oil heating especially when the engine is cold, and it will cool faster when the engine is off. Therefore, this product will give you steady and better warm-up RPM. Additionally, with good ventilation, the oil will stay cleaner for longer period.
Besides, the breather valve is also efficient in removing small particles and soot through breather hose. It ensures the engine oil will continue to flow even when the filter has clogged. The bypass valve opening is the only way to keep the motor from becoming oil-starved if the filter becomes clogged. Therefore, the Uma Racing high performance bypass valve not only will greatly reduce the engine pressure, but it allows you to ride with worry-free."
This post has been edited by piju: Jun 4 2014, 01:34 PM 
May 19 2014, 01:35 PM
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