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Yeah, the power out from the battery is DC. Just make sure your alternator can supply enough to recharge the battery, or else the battery will be drained. Get yourself a higher capacity battery

That 'misfiring system' you are talking about is only available on turbocharged engine. The fire coming out of the exhaust is caused by carburetor is set too rich, so unburned fuel accumulate and ignited by the hot exhaust.

what do you mean by 'terdometer'? are refering to tachometer? the meter which indicates engine's revolution reading?

Haha, but in that picture, that is definitely a racing boy product

Yes, you are right about using the compression gauge to identify condition of the piston ring and the cylinder itself. But the method also applicable to identify what kind of power the engine is making. Higher compression ratio will result in higher pressure reading on the compression gauge...

ok, now i understand what your question really is. You are referring to 135LC right? i never measures stock engine. So maybe others can help?

Racing boy sell gearbox for this bike, check up this link http://racingboy.com.my/racingboy/produ ... 0&catid=79 Not sure about the ratio of each gear though.

Quite simple actually. Compression ratio is the ratio of the cylinder's volume when the piston is at BDC divide by the volume when the piston at TDC. Let say the former volume is 100cc and the latter is 10cc. 100/10 equal to 10:1 compression ratio. You can calculate it by measuring everything...

Here in Malaysia, it is called Yamaha 125z. I'm not sure what is it called in other country.

I wet my pants off everytime i watch and listen to the 200cc 125z video in the youtube. Those guys are crazy! Here is the links: http://youtube.com/watch?v=oRJd1EV8GDg http://youtube.com/watch?v=XqCxe6x4jGY

Here is a picture of the clutch assembly. About the clutch lining you mentioned earlier, are you referring to the friction plate No 21?

Herm, if i not mistaken, the 200cc 125z is using liquid cooled cylinder head from a motocross bike.

And the stem diameter are 4.483mm for the intake valve and 4.468mm for the exhaust valve, according to my trusty micrometer caliper ofcourse.

Haha, yeah yeah. We demand more stuff :lol: Do you any picture of the 30/25 big valve head? just curious on how it looks :twisted:

In my opinion, there is no such thing as 'the best' design. Engineer designs parts in compromise of many factors such as reliability, cost and many others. And will improve the design thru testing and feedback. Anyway, to be able to talk directly to the person who designs, manufactures and sells...

Refering to above picture, are the valve seats getting a 5-angle job? It's look like it got one. What is the connecting rod length? Your 180cc kit is a killer dude!

Re: t135 fi Thanks for the fuel injection system picture, really appreciate your effort. Apart from the component that you mentioned, did you notice any sensor? For example mass airflow sensor on the throttle body or along the intake manifold? or is there is any other sensor on the exhaust...

There is one go-cart track at USJ. This track has been used quite often for the National Scooter Prix race track event. Beside that, there is also another go-cart track next to the Shah Alam Stadium, but i do not know if they still allow bike to race.

I think by making the ports bigger, you are getting more volume of AF mixture into the cylinder, while smaller get you more velocity versus volume. I might be wrong, but that is just my common sense logic.

what octane? what do you mean?