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rotax990 vs 991

g.pink

New member
On BRP Rotax website the specs for the 106hp Spyder engine(991) are quite similar to the 139hp(990) Aprila engine. Is this just a matter of tuning and mapping or difference in hard parts?
 
I helped by bro-in-law put in high compression pistons and a fuel management system in his :spyder2:. Don't remember where he got them, Evolutione?. (Once I rectified my error in timing of the front cylinder, it ran quite good. The nanny was having all kinds of fun!)

Wayne
 
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