I am sorry to beat this subject to death but I am curious about the 04 KX 125 cylinder. I have it jetted correctlyThe plug is a br8es and it is perfect. Also I started to play with the timming. So here is my dilema it feels like the top end is not what it should be my compression is 160# so thats good, I read in erics hand book that the cylinder base needs to be turned down .030 to match the yz. Will this aid in keeping better over rev, or would widening the ports help? The reason it is so short on the pipe is that the transfers are too high right? Back to the timming if I set it at the full retard position it seems to help some. How exactly is the PC pipe different from the stock one, Does it help a sufficient amount. BTW my gearing is 13/51
Eric or Rich
- Thread starter hot125mod
- Start date
hot125mod said:
Retarding the ignition timing will increase the temperature of the exhaust gas. As the temperature of the exhaust gas increases the pipe "tunes" at a higher rpm. It's similar to shortening the tuned length of the pipe.
Hope you do not mind me butting in, BUT, shouldn't you be running the correct plug to begin with? Since when is the es series plug known for its top end performance? http://www.ngksparkplugs.com/part_finder/motorcycles/step4.asp?id=1866&type=reg
- Thread starter
- #4
no wffr you didnt but in at all i did not know that the es was like that. so my question is is the kawi cylinder just designed like that. the bike is fast and runs great but feels so short on the pipe. maybe I just need to shift earlier, It is just habit to rev the piss out of it.
Pete Payne
MX-Tech Suspension Agent
- Nov 3, 2000
- 933
- 38
First things first .
Who built the cylinder/ porting ???
Do you know where the port timng is ?
Who built the cylinder/ porting ???
Do you know where the port timng is ?
You would probably do well with putting the timing where it is supposed to be and jet your engine. You then need to look at your plug. Use the cheap welding plugs to jet with. Look at the plug to see if the timing is good. Reeds and packing good? Is the bike/cylinder new, or new to you? I would have figured an engine would not even run with the timing full retarded. Care to explain what a light switch means to you? On a 125, a powerband that jumps off idle and pulls hard all the way up would be ideal! If it is falling on its face off idle, then catching: adjust your air screw and see if your pilot is too rich.
