Hi, first post
I purchased a used Saito 150 that seemed to be in pretty good condition. I replaced the bearings, set the valve timing and valve lash
per the book. I am confident these are correct. The engine has good compression and runs reasonably well. It seems to have a sort of knocking sound especially at idle and at certain speeds seems to rattle. Sometimes reminds me of pre ignition. At idle I hear this BAM, BAM, BAM hard hitting sound. BTW I can't get a reliable idle below about 2900 rpm. I am using Cool Power 15%, 18X6 wood prop well balanced. Last night I removed the back plate to take a real close look at the rod bearing fit on the crank shaft journal. At TOC on non compression stroke by wobbling the prop back and forth I could see some play in the rod bearing fit. I know there is a oil clearance on this fit. Just don't have the expereince to know if this fit is to loose and causing the knocking. Any help or suggestions would be greatly appreciated. Don't want to buy a lot of unnecessary parts and end up with same problem.
Thanks, Don