Part no. 550201063. May also fit 1970 to 1975 KX125/250 MXers with round tube swing arms. I’m not absolutely certain of this so check yourself.
I searched the web for this chain guard and found squat. Not surprising, the bikes are so old that companies just don’t bother to stock slow moving parts. I suspect you, like me, don’t want a dirt coated chain wearing through your swing arm like a chain saw. I’m sure your guard is worn and needs replacement after 42 years if it’s still attached.
I am now making this chain guard and offering them to my KL friends. It is made of ABS plastic, which is tough stuff. I found what are called Click-Lock black nylon rivets that fit into the 6mm holes above and below the swing arm to keep the guard in place. You simply insert the rivet into the holes and push the top and an internal pin spreads the plastic inside the swing arm. I will also include two 6mm button bolts if you have a 6mm tap--this offers more holding power. Remember to keep your chain slack within factory specs.
Contact me at 952-607-6063 or
$11.30