ORIGINAL: flyer95
xjet,
Have you tried the OS-F plug?
ORIGINAL: speedster 1919
I read an article on the web today (should have marked it) from a self proclaimed Super Tigre expert. He said the fix to ST carb mid range problem was in glow plug selection. Not to throw an OS F or other hot plug or even an OS 8 in them. The fix was (silence) Idle bar plug
This is what I mean about the ST engines... one person suggests and OS-F, others say "no, don't use an OS-F"
The truth is that there is a *major* problem with the ST carbies that requires people to try all manner of voodoo magic to try and overcome it. Sometimes it works, sometimes it doesn't.
Yet OS, Thunder Tiger, Magnum and a raft of other manufacturers can design and build carbs that don't require all this crazy playing around with nitro percentages, idle-bar plugs, 4-stroke plugs, magical prop-sizes etc.
Just about everyone except ST can build a carby that just works well, regardless of your prop, plug, fuel or whatever.
To all those who suggest that these other fixes are the solution -- you're busy trying to address the symptoms, not the *cause* of the problem -- which is the carby.
The proof is -- just replace the ST carby with a Magnum, Perry or OS carby and all the problems go away, as if by magic.
Point proven, problem solved.
But, for whateve reason, ST refuse to make the incredibly minor alterations that would be all it takes to turn an "okay" engine into a superb one.
Bax has repeatedly dodged this question in the ST support forms -- why?