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Makotosun

AT1 Timing

  • Clegg
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AT1 Timing was created by Clegg

Now that I have spark and the AT is running, I looked up the spec. The 1970 AT1 manual states 2.0mm btdc. The 69-71 manual says 1.8mm btdc. 

What is the best?  I also want to verify that the advance needs to be blocked open (full advance) before setting the timing?
1971 SL350, 1973 Bultaco Matador, 1978 XS650, 1979 MX175, 1982 XT250, 1982 GS650, 1982 CB450T HAWK, 1979 IT175, 1977 Suzuki TS185
29 Apr 2025 11:15 #1

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Replied by RT325 on topic AT1 Timing

Yep 1.8 on advance. All motors below 250 seem to be that pretty much. But with auto advance it retards to 'guessing' near tdc, not quite.
29 Apr 2025 15:29 #2

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Replied by MarkT on topic AT1 Timing

Yes, advance needs to be blocked open and 1.8mm
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
30 Apr 2025 08:21 #3

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  • Clegg
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Replied by Clegg on topic AT1 Timing

Perfect, thanks. Got that done today, a little tweaking on the carb and she purrs like a kitten!
The smoke has subsided also. I assumed excess oil in the crank.
1971 SL350, 1973 Bultaco Matador, 1978 XS650, 1979 MX175, 1982 XT250, 1982 GS650, 1982 CB450T HAWK, 1979 IT175, 1977 Suzuki TS185
The following user(s) Liked this Post: MarkT, Ht1kid, Sneezles61
30 Apr 2025 16:35 #4

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