Hi There I am new to the site and have a new Chinese hit and miss cant seem to get going very little compression check the spark valve clearance 5 mm lube every thing with marvel mystery oil, fuel coleman with 2 oz Mystery marvel oil to a quart which is 15 to 1 which may be to heavy I fly rc 2 strokes at 32 to 1 but dont know instructions are ?
Try moving the valves by hand. Sometimes a little dirt keeps the valves from seating properly. Mine had that problem at first. I jiggled the valves, then I got proper compression. I use a 16 to one ratio of Coleman fuel to marvel oil and it
works fine. Good luck. I hope this helps.
Sometimes your valves aren't closing all the way.
Possible causes are:
Spark plug boot rubbing against spring retainer.
Pushrod binding just enough to prevent full retraction.
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