Mine went downhill at 47 - I went in and within 45 minutes I was out and happy. seemed like someone switched on the lights. He also said that anybody who gets to 50 without needing reading glasses is either a VERY rare bird indeed, or a vain dope :-)
now, some CDI part numbers for your enjoyment!
PE
1977 PE250B 32900-41420
1978 PE175C 32900-41420 1978 PE250C 32900-41420
1979 PE175N 32900-41421 1979 PE250N 32900-41421
1980 PE175T 32900-40520 (30) RS175T 1980 PE250T 32900-40620 RS250T
1981 PE175X 32900-40531 RS175X 1981 PE250X 32900-40620 (30) RS250X
RS175Z
1982 PE175Z 32900-14410
1983 PE175D 32900-14410
1984 PE175E 32900-14410
1980 PE400T 32900-40920
1981 PE400X 32900-40920
1982 PE400Z 32900-40920
RM
32900-41320 1976 RM125A, 1977 RM100B
32900-41321 1977 RM125B, 1978 RM125C
32900-41210 1978 RM100C,RM400C
32900-41111 1977 RM370B,RM250B, 1978 RM250C/C2, 1979 RM250N
32900-41112 1980 RM250T
32900-40220 1979 RM100N,RM125N 1980 RM100T,RM125T
32900-40420 (21) 1979 RM100N,RM400N, 1980 RM100T,RM400T
32900-40422 1981 RM465X
TS
32900-30511, 1977 TS185B, 1977-1981 TS250