Howzit guys, hope someone can assist me. Iím struggling to get an old replacement engine to start easily and is running hot which would point to it running lean / suffer from an air leak as it has on two occasions soft seized while riding at 50% of throttle - at a speed of roughly 50 to 60 kph.
The question I want to ask is this. Iíve noticed that it splutters fuel back up the carb when opening the throttle. Iíve measured the space between the rotary valve and casing and this is in excess of the recommended 0.05mm which could point to the excessive air intake and erratic idle and poor starting because of the inability to suck fuel into the chamber - yes? Is it possible to have this fixed by having the casing welded? Iíve even heard that installing a leaf spring valve typically found on LMLís could assist.
Can anyone assist with a perspective here. Footnotes as follows: jetting is 160 BE3 118, idle is 45/120 instead of the standard 55/160 to run it a little richer. Iím mixing oil at 4% currently as I live at the coast and running a B7ES plug which looks light chocolate brown on a chop.