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Old 12-04-2013, 07:15 AM   #1
srrhoades OP
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Joined: Sep 2008
Location: Beautiful Iowa, stop snickering!
Oddometer: 8
'75 mx100 head swap

I recently found a '75 mx100 that needs a lot of love. The cylinder head is cracked between the two plug holes. Does anyone know if the later mx single plug head will fit, and would that give better compression and a more uniform head temperature?
Also, the fork has a damaged lower leg. What would be the best fork transplant for the little 19" wheel. Maybe a newer yz100 unit?
Thanks,
Steve
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Old 12-04-2013, 02:25 PM   #2
stainlesscycle
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Joined: Jun 2008
Location: morgantown, wv
Oddometer: 2,146
later era mx100 head will work.

you could swap the whole front end (triple trees etc) and get 32mm forks using mx125, mx175, dt125/dt175 etc.or you could get 34mm front end using mx250/dt250/mx360 etc. the 1975 mx360 front end is just about the best 7" travel fork you can swap on easily.

i don't know if the yz100 front end will work - after 1977 or so, the triple tree offset on most of the bikes is so different, that the forks hit the tank at full lock. and some yz100 were 35mm forks...

i have a 75 mx100, i put a 21" front wheel on it, a 28mm carb from a mx175, and a electronic ignition from a 1979 dt175, and that was it. one of the nice things about the mx100 is it's so light, i didn't want to add any weight to the front with bigger forks.. but the stock forks are really spindly..26mm maybe - i can't remember? i have a 74 mx125 pipe i may put on it eventually to see if that does anything good for it. that little bike screams with the bigger carb...
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Old 12-04-2013, 04:16 PM   #3
srrhoades OP
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Location: Beautiful Iowa, stop snickering!
Oddometer: 8
Thanks stainless. That's the second old Yamaha of mine you've come to the rescue on!
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