Question about 2004 Yamaha Royal Star Venture
I've restarted my RSTD in Southwest U.S. temperatures well above 100F after short stops and experienced the same symptoms; choking the engine fully prior to a restart and releasing the choke after the engine fires seems to eliminate the stall. I suspect that heat rising from the engine boils most of the fuel from the carburetor bowls, and full choke pulls enough fuel back in to keep the engine running.
The owner's manual recommends 20W-40 in that temperature range. DO NOT USE ANY OIL MARKED "ENERGY CONSERVING", it contains molybdenum disulfide (a friction modifier) and may make the clutch slip. Tourers that drive long distances and operate in a wide range of temperatures generally recommend synthetic lubricants - Mobil Delvac 1, Mobil-1 SUV and Shell Rotella T Synthetic are names that keep popping up. Personally, I've been using Rotella-T (T6) synthetic for 111,000 miles (and used Mobil-1 0W-40 for 9,000 miles prior to that), and the bike has required nothing but routine maintenance. I've used the bike in temperatures from 11F to 118F (ambient) without negative effect.
Posted on Jul 25, 2010
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Posted on Jan 02, 2017
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