1981 KX 125 Dilema
Posted: 06:09 pm Mar 14 2021
I have a very clean 1981 KX 125 I bought sight unseen from a guy in AZ and had it brought down to me in SoCal, it was supposed to have a completely rebuilt engine with a KDX 175 top end. When I got the bike it started easily and sounded very crisp but when the bike was under a load it would miss (not jetting) and it has pretty bad vibration. I came across a 1980 KDX 175 that was pretty rough but was supposed to run good so I swapped that complete motor into the KX. It runs good but is very slow so my guess is it needs to be rebuilt. I also have an 86 KDX 200 motor sitting in my garage that also needs to be gone thru. My goal is to have the ultimate vet race bike, I race 50+ intermediate and I am 165lbs so I love the 125 platform and the bike handles great. I guess my question is should I build one of the 175 engines which is a bolt in or go for the 200 engine and do the necessary fab to fit it? Can the 175 engine be ported and tricked out to make more power? Help