Transit through YVR (Round trip US-India-US)

[im42]

I would like to fly round-trip from USA to India via YVR and back, on a flight operated by Air Canada (code sharing with United Airlines) in Oct-Nov 2019. I hold a passport from India and a valid multiple entry Canadian Visitor's visa.

1. Would I also need to apply for a Canadian Transit Visa in addition to the Canadian Multiple entry Visitor's visa I already have in order to transit via YVR (layover less than 48 hours)? Or is the Canadian Multiple entry Visitor's visa enough for the transit?
2. Is a layover time of 1h 35m typically enough to go through Canadian immigration at YVR and board the onwards Air Canada flight back to USA?

[newacct]

1. visitor visa is good for transit
2. You won't go through Canadian immigration when transiting to the US. You will go directly through US immigration (preclearance) at YVR. On the way to India you will go through Canadian immigration at YVR. I am not sure whether 1h 35m is enough.