27mm x 1.0 Left hand internal male threadsHonda:XR50/CRF50, CR80R/125R/250R/450R/480R/ 500R, XL80/100/100S/170, XR100/100R, FL250, ATC70/110 (CDI ONLY), ATC185/250R, TRX90 93-00, TRX70/125/250 & EARLY 50cc
Kawasaki: Most KX85 & 100, KD/KX/KDX80, KM100, KS100, KS125 & most two-stroke external flywheel models and earlier point-type ignitions
Suzuki: Most RM100 2 Stroke, Quad Racers, 125/160EK/250R, DR100/125/200, DS80, ALT185, 50-125cc Trail & Street models & most late model RMs
Yamaha: Most single cylinder off-road, enduro, MX, YZ & Quads with external flywheels 1968 & later, YZ450F 2003-2005, most YZ250F/400F/426F, BW80, RIVA50, PW50, RZ350, TT500, XT500, YFM80/100/ 200/225, YFS200, YFZ350, YSR50, YT125/175
KTM:65SX, 85SX, 105SX, 200EXC/MXC 98-05, 125/250 SX/EXC/MXC 98-05 & 250/300/380 SX/EXC/MXC
