ORIGINAL: speedster 1919

Stop Outacontrol----Why in the world would you want to use a $9 OSF or a $5 FOX MIRICLE plug when a $2.50 Fox RC LONG Idle bar plug will work just fine. First you didn't mention your nitro amount. A super Tigre will barely tolerate above 10% nitro and how old was your #8. It is reported that the Fox Idle Bar plug is the perfect plug because of timing for a ST engine. This is a medium hot plug. These plugs were invented for the Super Tigre's on purpose and don't flame me it was only for baffled pistons. With the RC LONG and a tad leaner on the low speed needle you will be fine and will not notice a RPM loss when removing igniter.
The only 2 stroke engine I own that did not like the Fox Idle Bar when it was start up cold was a TIGER SHARK 61 .I think it was FLY BOY DAVE that said a K&B 1L was the fix to start up noise. IT DID --Funny I have a TIGER SHARK 46 and the RCLONG is just fine. Don't get me wrong, once the TS61 warmed up the Fox RC LONG was just fine.