MXZ 670 Engine Mods

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These are some of the mods I am going to be doing to my 1996 Skidoo MXZ 670 and will have detailed videos of each soon. I am going to rejet the Mikuni carbs to the 1998 MXZ 670 spec, install a 501 rotary valve, cut the Y-Pipe and do an oil injection delete.

These mods are in addition to what I have already done that you can see here:

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4 COMMENTS

  1. Best mod I’ve done over the years was sc3 skid, SLP SLT ski, drop top gear by 2 (max) and a proper 1.5” camoplast XC paddle track.
    Stock clutching is ok just clean and adjust.
    I’ve tried all 3 intake boots and motor mounts depending on y-pipes between the summit/mxzho
    I try to keep stock as possible.
    The power that comes out of these 670 /ho is amazing. I still pull newer sleds to this day.
    Time to rest the old rotary giants 😢

  2. How Many horsepower? Anyway Nice sled man ! Me i have a summit 1998 and he had about 135 hp and he stand up ealisy

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