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ttr125 with xr200r motor

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After looking at the costs to significantly increase the power of my son's ttr125 I opted for another route. Honda xr200 motors are plentiful and fairly inexpensive, I can weld and fabricate, sooooooo... we now have a ttr200. It appears to be about 7 lbs heavier but has lots and lots and lots of torque. I applied all the hot rod tricks I know to the xr200 motor (deck the cylinder, port, polish, match, radius, etc) so it runs real strong for a 200cc motor. No amount of mods and $ could ever bring the 125cc motor up to the torque & horse power of this 200 install. It pulls reeeaaally strong at any RPM and any speed. It is a lot of fun rolling up to 200cc to 250cc 4 strokes with our little ttr125 and keeping up with or pulling past them. I honestly can't feel the weight difference between this bike and a stock ttr125.

If you like to weld and fabricate I can post some hints and advice on what to consider when grafting a xr200 motor to a ttr125 frame.

I am good with a torch but not so good with a computer so if someone will give advice on how to post pictures I would be glad to do that too.

This is a fun forum. I have liked reading the posts and really had fun reading the replys.

Release the pigeons and let the games begin.

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I would have just ridden the XR all modded. Bigger better handling frame and wheels with more suspension travel.

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We were going to get an xr100 because that is the largest bike he could sit on and still have his feet barely touch the ground. I had a nice xr200r at the time but there is no way he could ride that. Five foot tall at age 11 and too short to ride the xr200r.

We found a motorless ttr125 before we found an xr100, both having a low seat height, and got an xr200 rat bike for a motor/carb/electrics donor before we could find a ttr125 motor. As it is, he grew from 5' tall at age 11 to 6' tall at age 13. We have now found a ttr250 basket case.

The ttr250 has a destroyed motor that I am now welding and rebuilding. It has no electrics so we are trying to find parts that will work for that.

The ttr200 is a blast to ride around and is unstoppable but the ttr250 should be the perfect trail/woods/fun bike :banghead: . In the mean time I found an ugly, but mechanically sound, '83 yz490 for him to play around on :banghead: . And play he does. I hope I have not awakened the Throttle Happy Monster.

I will post pictures in the future.

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I will post pictures in the future.

sounds like a odd invention :banghead: not a bad idea tho

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I want to see those pictures!

I would like to know what particular challenges you had to overcome to get

the XR motor into the TTR. I have an XR100 with a Powroll stroker XR200

motor in it. Still have a big list of little things to get sorted out on it.

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