I've had a chance to get the YZ 125 out at two very different riding areas, one was pretty flat, wet clay dirt, really rocky and high speeds.
The other is my woods stomping gounds, consist of wooded single track, and about 1500-2000 elevation gain from the staging area (4500 ft) to the upper side trails. The temps were cool, in the 50's and the ground was wet from rains from earlier in the week.
I really have not done much to the bike, other than:
New Pro Taper Bars (CR-HI Bends)
New Tires (MX51 Front) (S-12XC Rear)
New S/A Leo Vince- man this thing hush!
I pretty much went through the bike from front to rear and greased it up, put in some wheel bearings and dust seals and that was it!
The compression was at 165 and jetting is closed to factory, the main jet is down two sizes from factory.
I am running 32:1 800 Motul w/ 50/50 100 octane gas and pump gas.
I am really happy with how this little bugger runs!
The suspension: I set all the clickers to OEM settings and have been adjusting from that point. The forks are really nice offroad, a tab bit harsh in the mid stroke, but nothing I can't fix with the blade of a screwdriver. I did make a few clicks on the trail and noticed a smooth stroke all the way through. I have the sag set on the rear shock set to factory, but I will need to get a heavier spring before I start to race this jewel in Jan.
It handles much different than my GasGas, slimmer, lighter, and much more flickable. I am a stand up rider and it was pretty easy to get everything adjusted to my liking. I really like that my boots don't hang up on any of the plastic. It is very easy to move way up front and get aggressive on this thing.
Havinge GPR stablizer took any twitch out of the front end, I was able to plow through some really nasty rock gardens with out really having to worry.
The brakes are solid and the rear is a tad to touchy, a slight adjustment of the pedal will fix that. Front brake is killer, not as good as my Brembo I had on my GasGas, but close!
The motor is really nice, but not GasGas 200 nice, but nice! The low end is not even in the same ball park! The grunt is missing, I mean way down low.....and I was expecting that and it is not right to compare the two as they are different in every way
2, 3rd & 4th gear is where I had the most fun. It has some very nice roll on throttle exiting turns, without using too much clutch. I selected some really nasty rutted, rocky steep climbs and I found myself able to get up pretty easy, had it been dry, things will be different. I did have to change up my style a bit coming off the 200, but for a 125, at 5000 ft, hauling a 200 pound guy, through the woods, I am really happy. This was only my second outting on the bike and so far, I am pleased.
I am not sure about adding a flywheel weight yet...on the fence....
I do see a 36mm SmartCarb in the spring
Here is a few pictures. I love my 200, and I am keeping her in the stable. My 18 year old son loves it!!! He said to me all day riding on Saturday....Man I love this bike!!!! It is so easy to ride!
Wrong Bike