Vintage Dirt Bike Q & A

hi, im looking at selling my 73 cr250m, its not a cherry bike,but its all there , the tank is dented, the pipe has been patched, and it looks like somebody patched the crankcase with jb weld where the chain came off or a rock inbetween the chain and sprocket, im going to replace the seals because i think theres an air leak there someplace. If i dig out the jb weld can i have that welded, is it magnesium or aluminum. Any help would be appreciated. Thanks

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1980 rs175
1973 cr250m
2-1979 rm125
always looking for 79 or 80 rm250 or rm400 and also pe models the same years

Sum of the parts would probably be ~$800 range. Quite a bit higher if you got it running.