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It will probably need one more tooth on the rear sprocket.
The Shop
Edit to add: Thank you Yamaha!!!!
E-start would be epic! But that ain't happening as it would require engine case re-designs. I think the 250X could be a legit KTM/Husky/Gas alternative if it had e-start.
Think I’ll stay on my 04 for now
Pit Row
The lines are almost the same, the key word being "almost"...
Still don't like blue rims, but it's much more attractive to me than the 125.
With all the modern tracks being designed around the power of 4-strokes, wouldn't it make sense to come out with a 350cc 2-stroke MX machine? "But you're not allowed to race it!" Well, your average rider on a 125 against 250 four strokes, you can find him way in the back of the pack, more than likely casing the shit out of everything, so how fun is that?
I completely get a 125 would be a fun bike if you're extremely fast, like damn near pro level. Just the challenge of being handicapped on power but still being competitive/winning races but what's the appeal for the average Joe?
If Yamaha came out with a YZ 350 2-stroke with all the new tech, bells and whistles nobody would be able to keep that bike in stock.
The old spark advance was just based off one variable - RPM, essentially giving you a spark curve (think of an old school V8 with a distributor with weights and springs). You can make this work well for one load only - so you usually tune it for WOT. But then it will run poorly at partial load and make the power feel less linear or hard to ride. Adding the TPS allows you to map spark against 2 variables - RPM and throttle position. Now you have a "surface" or 3D map instead if a curve. You can do a much better job at optimizing spark advance everywhere. (This would be similar to adding a vacuum advance to that V8 distributor).
The power jet in the carb is a bit similar, but for fueling and can be used a few different ways. A solenoid turns the jet on/off based on the TPS/RPM and gives you a little more control over fueling. I haven't messed with this calibration much, but I believe it can be used similarly to an accelerator pump on a 4 stroke carb to give better response. You can probably use it to dial in WOT jetting too based on RPM.
Generally it's a better fuel/air control system paired with a better spark control system.
Totally different riding style and it forces you to really charge corners hard and maintain your speed. The 450 requires much more patience and focused technique to go fast on in my opinion, but the 125 just makes you ride so aggressively to go fast.
Plus, there is something satisfying about passing someone riding bike with 325ccs more than you.
Post a reply to: All new YZ125!!