Ever since entering 1/8 offroad I've been used RB motors.

Out of service: 1st WS7 RBMods lasted 3.5 gallons before loosing compression.
Club Races: S5 that has 4.5 gallons, running strong, great idle, great compression.
Larger Races: S7 that has 2.5 gallons, running strong, great idle, great compression.

On the two I run for club races / larger races. I have not done any maintenance on them its all orginal bearings & conrod. They idle like a champ, I've never flamed out in any race. Right or wrong I use the turbohead with a p3. I use 2045 with a 7mm carb restrictor always making the 7:30 pit window (8+ till dry). The tempatures are always reasonable 215 - 230's. I never adjust the botton end on these, only the top end sometimes. I love how all the parts for the S series fit each other, so even if I need to replace something I can always swap for a working engine. Have definately loved the RB engines. I've had two 2045 stingers bend / crack, I'd recommened JB Weld around the stinger to strengthen it.


I just got an awesome deal on a WS7 on ebay and will be breaking this in soon now.