MXZ 670 Engine Mods


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:

Please consider donating any amount if you found this video helpful:

Please click the red “SUBSCRIBE” button below the video to get the latest uploads to this channel



  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


Please enter your comment!
Please enter your name here