Blackknight / Mike & Others
All Formula Plus 89-91 had the "536" engine. 2*VM34
But, As a HO alternative Ski-Doo made this machines in some kind of "LE" models:
* -90 , Formula Plus "500" with the "537" , 2*VM38
* -91 , Formula Plus "X" with the "537" , 2*VM38
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They were never imported to Europe, but still my friend has one of these in his garage !!
We are trying to rebuild it 100%, but we have difficulties to find any tech. specs. on this machines !!!
Thaths why I need help !!
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The Rotax RV-engines with "End" outlet pipe always have bigger basic jetting on the MAG side !!
And the RV-engines with "Center" outlet pipe always have bigger basic jetting on the "PTO" side !!
I think you must have miss read the tech specs.......
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Compared to the ordinary Formula Plus with "536" ( 2*VM34 ) and about 60 Hp. this machines with "537" and 2*VM38 had about 85 Hp !!
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Please, help me out with my problem about the jetting and the RV-disc on this machines.........
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Sorry about the grammar and the spelling !!