Advance timing for better performance zomgshen cg200
 

I've read that some people grind out mounting holes so they can advance timing. People say it adds a notiable difference. Couldn't find any instructions /guidense how to do this and how much to advance ect ect. Anybody have experience with this? Thx

Are you talking about advanceing the cam or ignition timing?

the thing with anything built on a prodution line things end up slightly
diffrent to what the specs say they should be...
Honda XR are around 2* retarded cam timing on what Honda intended them to be
you could buy sloted cam sprockets.. you set the timing with a degree wheel
on the crank...

..

Sorry should've be more clear. Ignition timing. I'm looking for the little tricks/tips to get a little more power. Post I read the guy said it woke his bike up!

I've thought about doing this myself. By advancing the timing you may lose some low end power but will increase top end. At the same time you will have to run a higher octane fuel to compensate for the higher timing. But the correct way to do this is to get a programmable CDI to that you can keep the time where it is now in the lower rpm and increase timing in the higher rpm range. Like this http://www.dansgaragetalk.com/topic/...-time-mapping/

Just be aware that advancing the ignition timing causes a rise in cylinder pressure. As Jerry mentioned, this increases the amount of heat in the chamber and often means you have to run a higher octane fuel.

Before you get too deep into this, I would suggest getting very familiar with the whole theory and terminology behind ignition timing.

That said, here is the simple version. Your intake charge takes a fixed amount of time to ignite and burn. Because of this, it has to be ignited before the piston reaches Top Dead Center. This is why ignition timing is often listed as X degrees BTDC (Before Top Dead Center). If your engine currently has a base timing of 15 degrees BTDC, then to advance the timing means you are actually firing the spark plug sooner, so in this example lets say you advance it 2 degrees. Now your ignition timing is 17 degrees BTDC. Since the fuel is ignited even sooner before the piston is done reaching TDC on the compression stroke, it is fighting more pressure on it's way up, and the flame of the ignition is in the cylinder just a bit longer. All of this extra pressure and fire in the cylinder for a longer period of time causes an increase in heat, which means the plug and combustion chamber are hotter, thus at a certain point means you are more likely to run into pre ignition.

I would love to get my hands on that! Being able to program an actual ignition curve would be great, especially for those of us wanting to possibly bump the compression and/or do more performance oriented engine work like head porting.

Advanced timing
 

I purchased one of those " racing cdi boxes" that did just that! It advanced the timing,,,while there was a small gain ,,,, it was NOT worth it. As it made the bashan harder to start an it definitely ran hotter. ,,was not worth it,

That is why I am against simply advancing the timing across the board. True performance ignition tuning should be done with an advance curve. Something that will retard the timing at starting and idle RPM's, and then advance and/or retard the timing based on engine RPM.

Without a doubt, I would not mess with advancing the timing or other performance mods without some sort of oil cooler to help keep engine temps in check. The stock engine already struggles with controlling heat as it is.

One of the unheralded advantages of an oil cooler is that it also increases the oil capacity of the engine, which really helps an engine that is pretty skimpy on oil capacity to start with...ARH