Discussion Starter · #1 ·
New to the group. I am rebuilding a Fourtrax I bought for $1000. This thing was in pretty rough shape, but it's starting to come together. I have rebuilt the carb, new exhaust, replaced all bearings, the rear brake plate and hub, the rear diff case and rebuild (pinion side - broke while removing pinion bearing), and the list goes on. It is running great, but it is now smoking at startup. The smoke appears blue, and I am certain it is burning oil. I read that smoke at startup means bad seals. I haven't checked compression yet, because the bike is on stands in my garage, and I don't want to run it to warm up. My question is, should I replace just the valves and valve seals if compression is good, or rebuild the top end as well while I have it apart?