Engine Spark Plug Chart
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For information only
Check with an expert or your local ski-doo dealer to be sure!
Are these right?  Can you help with the ?s
If you know click here to clue me in and I'll update the information on this page.

Thanks to Bill in Northern Indiana for helping update the 775 engine information!

Under Construction--Please help others ID Models and Plugs!
Engine Model Cylinders Bosch Champion NGK
Kohler K141 1 ? ? ?
JLO L152 1 M225T1 UK10 A-6
Rotax 165 1 M175T1 UK10 A-6
JLO L197 1 M225T1 UK10 A-6
Rotax 247 1 M240T1 K57R A-6
Rotax 250 1 M240T1 K57R

A-6 (10.5 HP)
A-7 (14 HP)

Rotax 290 1 M280T1 ? A-7
Rotax 292 1 M280T1 ? A-7
Rotax 300 1 M240T1 K57R

A-6 (12 HP)
A-7 (16 HP)

Rotax 302 1 M240T1 K57R A-7
Rotax 320 1 M240T1 K57R A-7

(*) NOTE:  T'NT models should use Bosch MT80T31 spark plug.

Rotax 335* 1 M240T1 ? A-8
Rotax 337* 1 M240T1 ? A-8
Rotax 340* 1 M240T1 ? A-8
Rotax 342* 1 M240T1 ? A-8
 
Rotax 343 2 W260T1 L78 ?
Rotax 370 2 W225T1 ? B-7HS
Rotax 371 2 W240T1 ? B-7HS
Rotax 400 2 W260T1 L78 B-7HS or
B-8HS
Rotax 401 2 W240T1 14 mm plugs
M240T1 18 mm plugs
? ?
Rotax 434 2 W240T1 ? ?
Rotax 435 2 M280T1 ? ?
Rotax 640 2 M280T31 ? A-7
Rotax 641 2 M280T31 ? A-7
Rotax 771 2 M310T1 ? A-8
Rotax 775 2 M310T1 #506 A-8