Im pretty sure If you contact Jemco again they will make you a silencer. I know they were going to do it for my 81 KX250.
Trikes
1985 Tri-Z 250 Piped ported and PV'd
1985 ATC 250R trail destroyer!
1984 ATC 70 rebuilding
1982 ATC 70 stut wheeler drag bar an cooler rack equipped
1973 ATC 70 searching for parts...
Bikes
2006 KLX110 BBR160 Super R head ported BBR Super Pro rear swingarm ect...
1988 KX500 The Beast!
1986 KX540 In search of parts!!! Help if you have some
1982 CR480 Unlimited Evo Racer
1982 CR125 Unlimited Evo Racer
1982 YZ100 cheater bike...
1981 KX250 Unlimited money pit Evo Racer