Maintenance & Technical > KX250 / KX125
Interchangable parts?
CR480R:
I mean that its already pressed together and the crank wheels are out of true in several directions... After messing with it for over an hour and it is still .006" out... Its hard to imagine, but the crank pin can press in crooked.. I used some v-blocks clamped to the crank while pressing, but its not even close to accurate enough for this kinda work... Its not even worth trying without the proper fixture...
ihampson:
Can you buy fixtures or do you have to make one? i have never seen one before. Must be frustrating as you are only of by a fraction but that small amount can be significant at high revs.
precision engineering - easy with the right tools, a guessing game without!
what i`d give to have my own work shop!!!!!
CR480R:
Actually I may just re-press it... Last night a guy I know here in town offered to let me borrow his pressing fixture, He used to race motocross and run a small engine repair business... I hope it works, he said it works good and they usually press very close to true.... I noticed that my new crank pin fits tighter into one crank wheel than the other. The press I was using had a pressure guage and one half took 12tons to press and the other less than 8tons... So if I get this thing trued I am definately having my buddy weld the pin..
stewart:
i would not weld the pin,, the pin is diffrent than the counter wieght matirel and its a single throw,,, crank springs the hollow rod pin smaller about .005 thousanths in diameter to hold it in place ... takes the right fixture to get perfect ,,,,,,,,,,,,,,,,,,,,,,,,,,,, check run out thread cr 480,,,
CR480R:
Thanks for the input stewart :-) That is basically how I have been checking mine(I got the idea from your thread), my main problem is the pin wasnt pressed straight so I was of out of clock on the wheels and also crooked on the pin... Thanks for the heads up on the welded pin, it makes sense that a single throw crank wouldnt need it anyways... I am going to start over using a pressing fixture, hopefully It gets me close enough that I can get it true...
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version