Discussion Starter · #1 ·
I just bought an 84 RM250 and it is fouling plugs. I'm new to two strokes so i could use some help. I was running 32:1 and was told to lean it out to 40:1. This did not correct the problem. I know it probably needs to be rejetted but I have some questions before I start with that. First, the exhaust is gummed up. There is oil/gum around where the exhaust exits the cylinder. Is this a problem? Is there anything in the exhaust that I should worry about. I have read somethings on here about power valves but I am not sure what they are, what the do or where the are located. Second, I am assumming before I start with the jetting I should replace the reeds and see what I have. Is this a good idea or do the reeds have nothing to do with plugs fooling. I have check the compression and I am getting and holding 150 lbs so I am assuming this is good enough not to worry about a worn cylinder/rings. How do I know where to start with the jetting? I know I should start with the pilot jet but I have know idea which jet is in there. The bikes stalls when I come to an idle. Is this because the pilot is too rich or too lean. Reving the bike with the clutch in prevents but seems to foul the plug quicker. Lastly, to the Clymer book show a air pilot for the carb but there is not one on there. Is this something specific to the 84?