Its normal, The exhaust gas temp under 80% duty cycle is well over 1500*F....you are shooting a flame out 6-8" and all that thin sheet metal is getting hot fast.
On my race kart, the 6.5Honda would turn 10" of a 21" pipe bright cherry red under light load. My GX390 kart engine makes its pipe glow.
The time to worry is when the Muffler itself starts to glow..the casing, except in some spots, should not normally glow.
On my race kart, the 6.5Honda would turn 10" of a 21" pipe bright cherry red under light load. My GX390 kart engine makes its pipe glow.
The time to worry is when the Muffler itself starts to glow..the casing, except in some spots, should not normally glow.
