Dt 125r dyno
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@jonne123
My stock 2002 DT125R does a genuine, GPS verified 82mph. The speedo needle actually goes all the way to the edge of the clock, on a good day.
The only mod is moving, NOT cutting the "Reed switch" that plugs into the back of the speedo.
It appears to detect (by magnetism) when the speedo passes 65mph and retards the ignition. Move it out of the way, and voilà! No longer restricted!Use super unleaded and always warm the engine up before thrashing.
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A 125 cc 2-stroke is capable of delivering over 50 hp. I know a guy that has one in his go-cart - 48 hp at 16500 rpm, and it is not the wildest engine out there.
When some of you say "14 hp sounds right" you should know that those are detuned numbers, the engine has been choked down to produce less power. The DTLC and DTR engines gave 19-23 hp up until the day it was decided that 125 cc bikes should be limited to 10 kW, which happens to be 13.6 hp, give or take some margin.
I have owned three, my first two (1987 & 1990) were fresh and unrestricted and happily did 130 km/h+. My current (2002) was restricted when I bought it and would not do over 80 km/h. Detuning consisted of moving the reed switch away from the speedometer needle, and putting on an expansion chamber without the baffles that were added to the restricted models. It now revs happily to 9500, is every bit as powerful as my old ones. It tops out at 120 km/h because the gearing is too short, but it's fine with me because I only drive around town anyway.
So the bottom line is: no - 14 hp is not "normal" for these engines. They are neutered. In their nominal state you can get 25 hp from a 125 cc 2-stroke without resorting to magic.
The upside is that at 14 hp, they do not wear much. My two first went through several pistons over a couple of years. This third one lived its first 45000 km as restricted and is still on its first piston!
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Moral of the story from this I can see is
More horse power = power maintenance worm with pustion changes probably more regularly
Keeping the dep exhaust carbon reeds and sprocket changes seems like the best for performance with out risking blowing pistons more frequently
I did see a video on YouTube on how to make two stroked more powerful but with this there was a risk of blowing the engine maybe if you want a fast bike just get a bigger one?
I wanted a yz road legal but for daily use I can imagine these get warm and aren't really good for road bikes sure for the track for a couple hours it's all good
The dtr is a true work horse in my opinion
