I saw this KHI helmet in HotBike Penang It cost around RM180

Basically the higher the octane rating the better the fuel burn and hence the detonation, nearly all motorbikes are designed to run on low octane fuel. 91 octane is best for most cars and bikes, but using 95 octane gas is a waste of RM and won't yield more power or improved mileage. Higher octane gas is beneficial and needed only if the vehicles engine has a higher compression ratio of at least 11:1
but it all depends on the compression ratio in the engine. The higher the ratio, the better it would be to use high- octane fuel. Something like that...
If you had a big Ducati you'd consider using high octane gas, if it's a moped, biasa nyer sudah okey.
my2pence

nice explainations. but is it any side effect to the bike's engine part if use low octane petrol (those RON92)?

High octane fuels burn slower and cause their own unique set of issues for low compression engine, built up carbon deposits which effect rings and ports, piston top deposits. The latter can cause "pinging" due to hot spots caused by glowing carbon.
The slow burn prevents engine knock when cylinder pressures are high.
If your engine runs well and does not knock or pinging on low octane fuel, there is no advantage in
switching to higher octane gasoline.

This is from my experience using Shell V-Power on different bikes.

Honda EX5
Normal petrol - top speed 100km/h
V-Power - top speed 110km/h

Modenas Kriss
Normal petrol - top speed 120km/h
V-Power - top speed 120km/h + engine less vibrate

Yamaha 135LC
Normal petrol - top speed 140km/h
V-Power - top speed 140km/h + more pick up.

This is just my finding. Maybe different ppl will get different result.

..hmm petrol for speed, i thought meant for mileage or money savings
go for performance parts if you need speed

Install V-Twin engine on ur LC135 haha

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Added on February 13, 2009, 1:08 pmCurrently i switch to V-Power for 2 days cuz i wana try if there's any difference in power or not.. but so far i didnt notice any difference from it.. the only difference that i might notice is when the i accelerate to the max for each gear..

V-Power = During long acceleration for each gear i notice that when its coming to the peak of each gear my engine gets kinda rough compared to using the normal petrol.. like you said the engine knock noise.. is it bcuz of the petrol? or it's just my silly head


btw im using a 60mm racing block and took off my air-filter box.. and of cuz CDI.. so im not very sure whats goin on myself.. maybe i should try to use the normal petrol again and see whether the knocking noise will decrease or not...

This post has been edited by samba18: Feb 13 2009, 01:08 PM

135LC can benefit from higher octane petrol. This is because our stock compression ratio is 10.9, which is near to 11.0.

Besides this, RON92 petrol in malaysia is bad in quality, in the sense that, there are more impurities compared to ROM97 petrol. So, RON97 will definitely give more smoothness and performance.

Shell V-power is also RON97, but the petrol quality is higher than normal RON97. This means there are less impurities, and Shell actually put some additive with helps to make the engine smoother.

I can guarantee V-power gives better performance in acceleration, especially nearing to high rpm. The engine is easier to rev up compared to normal RON97. Top speed can't really feel it, because at very high speed, the air drag has already neutralize the slight increase in horsepower. EX5 can feel because the top speed is low, where the air drag effect isn't that great yet. (Yes, I was a owner of EX5 and I can guarantee that).

This post has been edited by charge-n-go: Feb 13 2009, 02:37 PM

Octane alone won't increase power. It only allows the potential for an engine to run a high compression ratio - and that's what will increase power. Run a high-compression engine on low octane fuel and knocking occurs

Knocking - also known as detonations - occurs after the spark plug has sparked. The spark starts a flame in the middle of the cylinder, which should spread out to the edges with a single flame front. But if gas at the edges of the cylinder ignites (due to high temperature or pressure) before the flame meets them, it causes multiple flame fronts in the cylinder. When these collide they create a sharp rise in heat and pressure. Occasionally slight detonation isn't a problem but constant and severe detonation will wreck an engine.

difference between high octane fuel and normal octane fuel is their ability to withstand compression. If you put normal octane fuel in your engine, that's fine. If you put high-octane gas in your engine, that's fine as well. Because both will withstand the compression of the engine. At this point, it's a question of whether you want to waste your money. filling normal octane gas in a high-compression engine will cause knock as it detonates prematurely from being compressed beyond its limits. Only high-octane gas will stand up to the higher compression.
In summary, running a higher compression ratio is what gives more power. Higher octane gas by itself does not.
so guys get a cbr600rr or R6 if you wanna use V-Power and VRoooommm to the next shell station..

Nope..i prefer stock parts. Racing parts usually make the engine rougher even though it will increase the performance significantly. What i'm trying to say here is using V-Power u can feel the different compared with normal petrol. One thing i can sure is the engine will run smoother with this petrol..

[quote=charge-n-go,Feb 13 2009, 01:34 PM]
135LC can benefit from higher octane petrol. This is because our stock compression ratio is 10.9, which is near to 11.0.

.. 10.9...!!?? Kawasaki ZX-10R at 12.7:1.
Suzuki SV650 runs at 11.5:1 at 10.9 your LC should be right behind them..
check your service manual again probably a typo,
it's said that standard compression was 5.6 kg/cm2, minimum compression is 4.9 kg/cm3 and max 6.3 kg/cm2.
maybe my manual is a typo..

Just tested my new bike,
abit disappointed,
though I am not belongs to this club (Honda 125X owner here )

The top speed of it just 100km/h
while my old Honda Class1 110cc Japan engin can run 120km/h..
Is it recommended to change the CDI?

Because my 125X can run 100km/h with 3rd gear,
when change to 4th gear, no improvement of speed at all...
the CDI has limit it...

Other than that,
how much you guy bought your sport rims?
Thinking to get Racing Boy 5 batang or 8 batang better?
Price is around RM195...

This post has been edited by cschun86: Feb 13 2009, 04:05 PM

Wah..125cc only can go up tp 100km/h only? Perhaps the speedometer is very accurate

Ei guys do u all heard about tat the speedometer of LC in M'sia is 20% higher than its actual speed?? In PH their stock LC can only reach 110km/h y??? N if our LC speed is 20% lower than our speedometer shown then y we can simply ''kill'' ex5, wave or anything???

Wave all are implant with CDI speed limit,
top speed is around 100-110km/h,
while EX5 top speed is also around tat...

LC if higher 20%,
stock LC can run 140-160,
so, still can pawn even after the 20% over rated.

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Added on February 13, 2009, 5:29 pmnot related to the speedometer problem,
confirm problem is lying with the CDI,
they dont want us to rempit it,
but sometimes u know in the high way,
it is hard for us not to speed while a truck or bus speeding 100km/h just beside you...




This post has been edited by cschun86: Feb 13 2009, 05:29 PM

I wanna ask u guys, where can i get the cover set LC at page 1.i never see before those cover before.where can i buy.....those cover very nice!!

Which 1 u talking about, but most of them has only 1 sit if u change d then u can carry ppl liao think about it.. N the coverset is no cheap at all....

not my Webpage

This post has been edited by scoffer: Feb 13 2009, 06:03 PM

already doing some review on 125S, which i bought for my mom a few pages back.
yeah, just like u said at 4th gear, i can't feel any torque at all. other than changing cdi, maybe u can try diff sprocket combination to overcome this prob. Lc135 also got limited rpm setted in the CDI. with anything stock, mostly will only unlocked from 9k rpm to 10k rpm....usually CDI will only changed after u've done other mod on ur engine such as camshaft, piston head, valve spring, etc since the effects is minimal with stock engine....

about the V-power petrol, tested today, filled up my tank full and tackling corners near my workplace. actually i felt that the effects on my engine performance is minimal, hardly noticible...i can only feels a slight better in acceleration, but its also might affect by my newly changed engine oil..

for engine oil, as what being told by other forumer b4 and also in the manual, the sweet spot to change our engine oil after 3k km is confirmed true. i am using fully synthetic oil, after 2900 to 3000km, i can feel my engine performance slightly degraded. after changing new engine oil, my engine performance back to normal again... yup, we can still use our EO up to 4-5k km, but if u are always riding ur bike with its true potential, then 3k km is a good limit...

I dont know how about the RON92 today, but a few years back in Malaysia, it really makes the engine feel heavier when I use RON92.

Theoretically is true that, octane alone wont increase power as long as the minimum octane is achieved. Under normal circumstances, RON92 and 97 should be the same, but again, the impurities level in petrol will determine the smoothness and responsiveness of engine. Perhaps long time ago RON92 is leaded. Maybe you can educate me on this.

Anyway, for V-power case, it really helps a lil in terms of engine smoothness, responsiveness and horsepower. Yeah, theoretically the same RON97 vs RON97 should have no diference, but practically, I can't cheat the feeling from my body and the result from dyno machine. I can see the graph is smoother when using V-power. Horse power increased very slightly at top rpm region. This is a dyno result of my fren who is driving a modded Kancil 660.

I enjoy the slight increase in smoothness and power with V-power. Its a difference of RM100 per year compared to normal RON97, but I am happy to spend that money. to pump V-power, normal RON97 or RON92, it all depends on the rider preference.


It is 10.9:1.

I have shaved off 0.6mm from the cylinder head and the compression ratio is about 12.0:1. The engine is more powerful now, but there is still no way to keep up even with a stock 125Z 2-stroker.

Compression ratio helps in horsepower, you are right, but what about the difference in engine size and etc? I really cant understand how LC should b right behind some big bikes.

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Added on February 13, 2009, 8:40 pmTry replacing the EFI to carburetor. It may help you to gain the speed that you should have.
FZ150 also has this problem. One of my friends replace the EFI to 28mm carb, and he can go from 140kph max to 170kph max.
Anyway, just for your reference, please ask someone who are more expert. It's js my 2 cents.

This post has been edited by charge-n-go: Feb 13 2009, 08:40 PM