ski-doo Timing

Snowmobile MichiganFor Information Only

Vintage ski-doo Timing Specs Below

Thanks to Gilles and Stephan (For information only, always check the proper engine manual to be sure).  Again, as everything in this site, for information only.  Always check with the manual or your local ski-doo dealer for the correct information.

Some 1970-1979 Rotax Single and Twin Engine Ignition Timing Specs

Engine Model Direct Timing BTDC (1) Indirect Timing BTDC (1)
245 (1976)* 0.035-0.055 in. (0.90-1.40 mm) N/A
245 (1975)* 0.037-0.057 in. (0.95-1.45 mm) N/A
247 0.147-0.167 in. (3.73-4.23 mm) N/A (2)
248, 249 0.077-0.097 in. (1.97-2.47 mm) 0.800-0.100 in. (2.04-2.54 mm)
250 0.150-0.170 in. (3.81-4.31 mm) 0.150-0.160 in. (3.81-4.06 mm)
292 (1970-1971) 0.140-0.160 in. (3.55-4.06 mm) 0.195-0.221 in. (4.95-5.61 mm)
292, 302 (1972) 0.147-0.167 in. (3.73-4.23 mm) 0.195-0.215 in. (4.95-5.46 mm)
294 0.084-0.104 in. (2.14-2.64 mm) 0.087-0.110 in. (2.19-2.79 mm)
300 0.150-0.170 in. (3.81-4.31 mm) 0.205-0.241 in. (5.20-6.12 mm)
302 0.147-0.167 in. (3.73-4.23 mm) 0.212-0.244 in. (5.38-6.20 mm)
305 0.111-0.131 in. (2.82-3.32 mm) 0.135-0.159 in. (3.43-4.03 mm)
305, 343 (3) (1978) 0.073-0.093 in. (1.86-2.36 mm) 0.087-0.107 in. (2.21-2.71 mm)
335 0.160-0.180 in. (4.06-4.57 mm) 0.220-0.250 in. (5.59-6.35 mm)
337 0.157-0.177 in. (3.99-4.49 mm) 0.229-0.249 in. (5.81-6.32 mm)
338 0.111-0.131 in. (2.82-3.32 mm) 0.132-0.154 in. (3.35-3.89 mm)
340 (1970) 0.160-0.180 in. (4.06-4.57 mm) 0.198-0.228 in. (5.02-5.79 mm)
340 (1971) 0.160-0.180 in. (4.06-4.57 mm) 0.193-0.220 in. (4.90-5.59 mm)
343 (1972) 0.137-0.157 in. (3.48-3.98 mm) 0.159-0.179 in. (4.03-4.55 mm)
343 (1973) 0.111-0.131 in. (2.82-3.32 mm) 0.131-0.154 in. (3.33-3.91 mm)
343 0.111-0.131 in. (2.82-3.32 mm) 0.135-0.159 in. (3.43-4.03 mm)
345* 0.035-0.055 in. (0.90-1.40 mm) N/A
345 (1978)* 0.034-0.054 in. (0.87-1.37 mm) N/A
346 (1973)* 0.109-0.129 in. (2.77-3.28 mm) N/A
396 (1973)* 0.060-0.080 in. (1.52-2.03 mm) N/A
346, 396 (1974)* 0..071-0.091 in. (1.82-2.32 mm) N/A
354*, 454* 0.045-0.065 in. (1.14-1.64 mm) N/A
399, 440 (1970, 1971) 0.160-0.180 in. (4.06-4.57 mm) 0.148-0.171 in. (3.76-4.34 mm)
401, 434, 435 (1972) 0.137-0.157 in. (3.48-3.98 mm) 0.146-0.166 in. (3.71-4.22 mm)
401 0.111-0.131 in. (2.82-3.32 mm) 0.135-0.159 in. (3.43-4.03 mm)
434, 440 (4) 0.111-0.131 in. (2.82-3.32 mm) 0.118-0.144 in. (2.99-3.66 mm)
435 0.111-0.131 in. (2.82-3.32 mm) 0.119-0.141 in. (3.02-3.58 mm)
436* 0.071-0.091 in. (1.82-2.32 mm) N/A
440 (1975)* 0.071-0.091 in. (1.82-2.32 mm) 0.077-0.097 in. (1.96-2.46 mm)
440 (1987, 1979) 0.111-0.131 in. (2.82-3.32 mm) 0.120-0.140 in. (3.05-3.55 mm)
444 0.082-0.102 in. (2.10-2.60 mm) N/A
503 0.068-0.088 in. (1.82-2.32 mm) N/A
* Engines equipped with CDI
(1)  Use direct timing for engines with vertical spark plug holes; indirect timing for angled holes.
(2)  On 1972 models, indirect specification is the same as direct.
(3)  On 343 engines serial number 3,019,645 to 3,020,644 direct timing is 0.147-0.167 in. (3.73-4.23 mm).
(4)  Except 1975 440 with CDI.

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