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2003 mountain cat 600 electric start efi after everything gets warmed up pulling a sled with dogs in it. my secondary gets stuck open replaced the rollers brass bushing and a new spring and it still does it.
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The secondary goes in when you pull the belt up.
This would be the old reverse cam driven. When you put the spring in did you turn it roughly 120 degrees before it went over the towers to tighten down. (clockwise)
If it was frozen up with significant misalignment, maybe.
But points more to me that there is a lot of corrosion and your main bushings in the secondary are likely in need of cleaning or replacement.