i use a 4pt engine in one of my 1VJs since some years.
from the 4pt, you should use the engine, ignition, wiring and maybe some switches.
the 4pt front brake is better than the 3AJ one, but to use it, you have to combine lower part of 4pt front fork with upper part & springs from 3AJ (don't know the english name).
for the rest, stay with 3AJ parts.
there is more information in previous postings (rikard the swede).
if you have enough money, change fork springs to white power, and rear suspension to öhlins.
regards
klaus
xt600.de / tech. dep.
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