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Friday, October 31, 2008

Yamaha LC 135 Coverset Model B

Yamaha LC 135 Coverset Model B

Nice design with nice colours. Need I say more?

Look for more LC135 coverset here.

Thursday, October 30, 2008

Yamaha LC135 Coverset Model A

Original post is from here. I have seen this in a forum discussing about Yamaha LC135 in Lowyat.net. They have in store a lot of LC135 coverset. I think I don't have to say a lot about it. So, just enjoy the picture!

Look for more LC135 coverset here.

Monday, October 27, 2008

Mikuni Carburetor Tuning Parts

Mikuni Carburetor Tuning Parts

Have you ever thought how will modifying the jets (main jet, pilot jet etc) in your carburetor can improve its performance?
Let me explain in most simple words.
Okay, now look at the picture. As you can see, from 0-1/4 opening of the throttle, the pilot jet takes the job to deliver fuel to mix with air inside the carburetor.
After the 0 opening and before it reach 1/3 opening, throttle valve takes the job.
After that, from 1/6-3/4 opening, needle jet takes the job.
Next, from 1/4- <3/4, jet needle takes the job.
And finally, the main jet takes the job after full opening of the throttle valve.

Then, how to tune this carburetor?
The basic rule of tuning carburetor is to make the fuel-air mixture remains consistent at any throttle valve opening, but you can also tune it to your preference.
For example, let say I have my bike to have good mid throttle valve opening performance for better pick-up for mid-RPM. So, what I can do is to modify the jet needle only. I need to get a thinner jet needle so that more fuel can be mixed when throttle valve is in 1/4-3/4 position.

One more thing, when you bore the carburetor to get a larger diameter for the airflow, you also need to modify or replace all the jets to a suitable one. You need to get thinner jet needle, larger diameter needle jet, larger main jet and larger pilot jet. If not, the mixture of the fuel-air will become to lean (less fuel, too many air).

Simply said, the bore size of the carburetor air intake must be proportional with the size of the jets.

Now, you can try to modify your own carburetor. Do this with your own risk!

For more info, click here

Denso Spark Plug: Iridium Power

Iridium electrode spark plug nowadays are very popular. This is due to the fact that it can give better combustion, better fuel economy and more power.
Spark produced by this plug is much stronger than the standard plug since it has a smaller electrode to make the spark jumps more easily.
To know more about this plug, you can surf here.

Tuesday, October 21, 2008

Battery's dead? Why?

Maintainance-free battery for motorcycles

Battery is not a very important aspect for bikers who drive RX-Z, 125Z and Honda EX5. This is because the battery is only used for signal indicator, fuel indicator and to drain the excessive voltage from the magnet to it.
But, it is very important for those who use electric starter bike such as LC135, FZ-150i, Lagenda and scooters. The problem is the battery is always dead at the time when we needed it the most. Why is this happening?
There can be three basic reason of why the battery can be dead:
1. Battery itself is condemned (cannot retain the charge anymore).
Solution: Replace the battery.

2. The alternator (or cut-off) is damaged (cannot charge the battery anymore).
Solution: Replace the alternator.

3. The bike is not used regularly and used a lot in start stop condition. When this happen, the battery is drained more than it could be charged by the alternator.
Solution: Charge the battery and use the bike regularly. If not, sell the bike to the one who needs it the most than you.

Wednesday, October 15, 2008

Y1: Yamaha RX-Z Racing Engine Block



Racing block for RX-Z is known as Y1. Y1 is very popular because it can withstand high temperature for long duration of usage. Also, Y1 has bigger displacement compared to Y2, Y3 and Y4. With Y1, you can also rebore the cylinder to get higher displacement without having to deal with overheating of the engine.
Original Japan Y1 block is very rare, since it has been replaced with the recent Y4. Anyone who wants to get Y1 maybe need to check for secondhand RX-Z.
The video here was found at YouTube, but there is nothing special to look at actually. I was hoping the uploader to show what he did with the block or tell us how to rebore the block.

Wednesday, October 8, 2008

Keihin PWK Racing Carburetors

Keihin PWK Racing Carburetor Dimension

Keihin PWK racing carburetor are the most common racing carburetor used in motorcross racing around Europe. Here in Malaysia, it is also popular due to its performance that can be gain by just simple modification.
Keihin PWK enables you to have larger diameter for air intake compare to standard diameter of standard carburetor. Most <150cc bike has 28mm diameter for the air intake where Keihin PWK has a range of 33mm up to 39mm. Larger size means higher fuel and air that can be burnt to give more power to the engine!
To find out more about Keihin PWK carburetor, I have listed out the best site for you to find more information about it:
1. Keihin PWK U.S.
2. Sudco - Keihin PWK Carburetor
3. Keihin PWK Jetting and Dimension
4. Keihin PWK 28 Parts Catalogue
5. Keihin PWK 33, 35, 36, 38, 39 Parts Catalogue

Yamaha T135 (LC135) Official Page

Yamaha T135 Official Page

I have stumble upon this very informative site about the research, development and roadtest for Yamaha LC135. Yamaha LC135 is actually codenamed T135 that is targeted for Asean market by exhaustive research by the Yamaha engineers.
Yamaha has a very excellent history in developing bike and also very successful in racing whether in MotoGP, motorcross or others.
At this time, there is no other bike that are in the same category as Yamaha LC135 by other manufacturer. This can be deja-vu to reflect to Yamaha RX-Z 135 that is also remain uncontested up to this day.
For more information, surf up to http://www.yamaha-motor.co.jp/global/asean-touring/machine/technology/index.html

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