alright, i bought a really good condition 1996 yz 125. It doesnt seem to have the powerband low enough. I am really into jumping logs, hillclimbing, rock climbs, you know all that good stuff/. But the problem is in order to be in the powerband i am usually going like 10 mph in first gear, what can i do to change this. It has a 49 tooth in the back, not sure whats in the front, has to be a 13 or 14, i hope to god its not a 14, but this thing needs some serious change. Is porting a gtood idea? how much, how long?
96 Yz 125 in need of some change
- Thread starter Blake7
- Start date
Don't know of online hill climbing stuff, but a 125 is never going to have much low-rpm power. I would recomend gearing it down (go to a larger rear sprocket) and get good at useing the clutch. The clutch is a really usefull tool on a small bore for keeping the motor in the powerband. Don't be afraid to slip it as needed. I tend to think of the throttle as an on-off switch and the gear box and clutch as the means of metering the power to the rear wheel.
good luck
good luck
wornknobby
Member
- Feb 5, 2004
- 625
- 0
i have a question though, why would he need to repack his muffler? i haven't heard of any power gain from this, though if you dont do it your bike may run rich an screw up your jetting, but other than that am i missing something?
silencer packing
Eric will probably laugh, but I believe the problem is that without good packing you get turbulence in the silencer and the gasses can't scavenge properly. On a 4-stroke this causes so much xtra heat that the can crack. Also, a cheap fix would be to mess with countershaft sprocket for your gearing. I have a shortened stock 99 yz125 silencer that I could part with, but I'm not sure it would fit.
Eric will probably laugh, but I believe the problem is that without good packing you get turbulence in the silencer and the gasses can't scavenge properly. On a 4-stroke this causes so much xtra heat that the can crack. Also, a cheap fix would be to mess with countershaft sprocket for your gearing. I have a shortened stock 99 yz125 silencer that I could part with, but I'm not sure it would fit.
