Chainsaw Repair

Farmertec 888 I was told revlimited to 11k 11.2K and box says 11.5k.  Unlimited coil is sold too separately.

OEM specs and weight

DISPLACEMENT    121.6 cc (7.42 cu. in.)
ENGINE POWER    6.4 kW (8.6 bhp)
POWERHEAD WEIGHT    10.1 kg (22.3 lbs.)
FUEL CAPACITY    1300 cc (44.0 oz.)
CHAIN OIL CAPACITY    700 cc (23.7 oz.)
OILOMATIC® CHAIN    .404" RM, RS
3/8" RS3
GUIDE BAR LENGTHS (Recommended ranges)    43 to 150 cm (17" to 59")
STIHL ROLLOMATIC®
POWER SOURCE    Gas