<div>Hi Guys, I have recently purchased a RCGF 65 and I am struggling to stop it four stroking at lower revs.</div><div>I inspected the slow run valve and discovered a groove machined into the threads there is a matching machined dia on the carb. This convinced me that it should have an O ring to stop air passing the threads. However Al's Hobbies say not and their stock do not have this groove.</div><div>Does anybody have this engine that could check if the slow run should have a seal.</div><div>Or point me to where I can get correct information.</div><div></div><div>Thanks</div>