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I changed the gearing on my 86 750 from 14-42 to 14-45. At 70 mph shes turning 5500rpm.

Could someone tell me what rpm @ 70mph they are running with stock gearing?
How many miles can you go before hitting reserve?
I can go 160 miles.

My brother & I are going to ride to L.A. later this spring, I am thinking I should put a 42 tooth sprocket back on for this trip. It's about 1000 miles one way. What do you think?

My brother & I are going to ride to L.A. later this spring, I'm wondering if I should put a 42 tooth rear sprocket back on for the trip.
 

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I went +2 on my rear (15/50) and I have a config 3.0 jet kit... and I *still* get about 160 miles before switching to reserve (the light starts coming on at 140)... I got 180 miles on it on Monday and it took 4.9 gallons to top it off so I figure I had another .4 or .5 usable gallons in the tank. I pull about 5K at 70mph ...`course, mine *is* an 1100.
 
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