My '06 streetglide w/ 95" upgrade, Mikuni 45 carb, stage II heads, Daytona Twin Tec ignition;work done in '08 rear cyl plug wet with gas each time it's checked. front cyl appears normal. Bike dyno tuned last year late summer. Tech has ck'd compression, approx 135 lbs both front and rear. Do I need a hotter/cooler plug for the rear? Any suggestions will be apppreciated. Thanks.

 

If your bike runs good with no issues, you didn't say, I wouldn't worry about it.