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It is very easy to gain more bottom end on the YZ 125. The FWW is a great addition but that doe snot add "engine power" If you re-chamber (not shave) the head to a better design, this will increase low end torque considerably. Also, getting the jetting correct is a big part of the recipe. The difference with the...

Thanks for starting the thread.. IF all contributing parties remain civil and open-minded... this could prove to be very informative discussion...You will, most likely, find some "words" or "theories" that contradict one's long time beliefs. Please remain open minded if this happens. One of the main reasons for this topic is to "dive in" to many of the "parroted" and...

I am trying to HELP ,via the discussion, eliminate the mis-information out there on this subject and others, if they come up .. IF the riders are not interested , that is fine as well.. I asked that somebody start a new thread IF there is interest in this topic.. We KNOW you are not interested in this discussion... Again...

Any high revving engine will require MORE oil if one expects to have any sort of crank life.. Depriving your engine (bearings) of oil, only invites early bearing failure. (like you guys have been experiencing) Engines running upwards of 11K RPM should be running 20-30:1 oil ratio (20 is better than 30 ALWAYS--> zero downside) and you need to run...

Again, I think it would be a worthwhile discussion.. If you guys want to get into the nuts and bolts of all of this.. I think we should start a new thread with the corresponding title?, then we can dive into it.. So, if somebody wishes to get that rollin... that would be great!

I hear these "squish set for octane" or "corrected squish" phrases quite often.. Would anybody like to discuss these phrases (and any others) in detail? I think it would be a good discussion

The squish clearance is just one "player" in the overall head design and function.. Having a better squish clearance does not necessarily mean you will have a better functioning head... It can help, but there is MUCH more to ombustion chambers than the squish. Seem most everybody is under the assumption that "correcting the squish" "corrects" the shortcomings of the...