MXZ 670 Mods Pt 2 501 Rotary Valve, Shorty Boots, Oil Injection Delete

In part 2 of the mod series on my 1996 MXZ 670 I am going to do the 501 rotary valve mod, install shorty intake boots, and do an oil injection delete. I will be switching to premix 32:1.
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[@Gleanerman78]

hey I was just wondering where you got your skidoo racing manual??.. and I'm looking for the specs on a 1997 skidoo mxz 583 rotary valve timing specs thanks

[@scoobysteven]

I have the same motor, however it is not in a Skidoo, it is in a Honda Pilot, FL400 ATV. The transplant required a great deal of custom fabrication. I’m trying to finish this project, but because I bought the engine already removed from the sled, I don’t know where to put everything. My question is, you mentioned a oil vent line, is this a return line? Also, on the bottom of the crankcase, the is a medium to large hose nipple, what is this line? I thought it was an oil return line, perhaps you can enlighten me please.

[@crashalexander7232]

why delete the oil injection?

[@codyjohnson5674]

Weight reduction and guarantee to never burn motor up. Pumps fail. Hence why all race ready sleds have mixed gas from factory