I got this 3 wheeler for free and the top end was taken apart and the head was missing. I got another motor from a local ATV salvage yard, pulled the head, cleaned it up and lapped the valves. I honed out the cylinder a bit and thru the piston and rings back in and put it together. I pulled the cord one time and she fired up BUT, she started smoking like a freght train a couple seconds later and didn't stop smoking. What is a good number for a compression test and how do the valve guides seal to the valves as I didn't see any rubber seals and the guides themselves? Thanks, Matt