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If the battery is good check the connector on the ignition switch harness, and the ignition/starter solenoid. If neither of these pan out corroded ground blocks or critters chewing up wiring in the off season are also possibilities.
Yammy dropped the top gear a tooth on the longer track versions of the Apex from the factory, I’ve done the same with the sleds I’ve converted. They also changed the secondary spring to a white at 60* on the 06-10 sleds, I did this as well when running stock clutching set ups.
Pretty sure the Mono skid has geometry issues if you extend it beyond 136/137 and don’t set it back. I’ve done several conversions over the years and they’ve all worked out really well, absolutely worth the time/cost/effort.
Of your Nytro is indeed 121 and has a 2.52” pitch track, and the 144 is a 2.52” pitch as well, then you are fine as far as the drivers are concerned. Grafting that suspension in is possible, but you’re going to need detailed measurements from the donor sled to make it happen.
Replaced mine with those last year. Next time I’m at the cottage I’ll lift the front end and see how loose they are after 3500km ish of riding last year. The OE top joints wear very fast anyway, but the lowers are better. I’m just not sure they’re worth the $.
It’s a ‘13 Nytro with about 15000k on it, but has oilite bushings, new ball joints this fall, as well as JRE spindles. I’ll talk to my buddy who parts lots of sleds to get an idea of what this stuff is worth and get back to you with a price if you’re interested.