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Message: [QUOTE="Skitspuce, post: 741349, member: 42351"] We have an '86 JR50 that I bought last year. When I got it home, I noticed that it had no oil in the tank, so before I fired it up I took the head and cylinder off. It still looked OK so when I put it back together I tightened everything up to "snug". It ran all year like that, ridden hard and no probs. (5.5:1 compression and a 1.6" bore = little stress on head studs :) ) Haven't had any trouble with the injection, either, and thats on an 18 year old bike. I did see a couple of posts about removing the injection...search for LT50s on a quad board - engine is the same. Apparently if you just let the pump run with no oil it will burn up and lock up. You can either remove it entirely and rig a block-off or I remember some mention of taking off a plastic drive gear and reinstalling. If you go to bikebandit.com you can look at the OEM section at the schematics and it'll give you a good idea of how it all goes together. [/QUOTE]