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1984 v65 sabre plug gap and NGK Spark PLug and heat range
Ngk dpr8ea-9
See related link from Cycle Magazine. 105hp
In the back of any repair manual.
105 horsepower at the rear wheel, as measured by Cycle magazine in 1983.
Clymer 1982 - 1988 Honda V45 & V65 Magna/Sabre repair manual has 0.031 - 0.035 in.
At least for my 83 V65 the fuel pump rests directly beneath the seat and above the pivot for the rear swing arm. Access it from the top, remove the two bolts on either side from the top, disconnect the power, turn off the fuel petcock, and disconnect fuel lines to remove the pump.
On the front of the bike next to the horn under the headlight.
There is no gas gauge on the 1983 Honda v65 magna. However this bike will get around 165 miles on a full tank. The best way to know how much fuel you have is to reset the tripometer on the speedometer each time you fill up, and refill at around 160-165 miles.
The V65 Magna takes 580cc in the left fork and 565cc in the right fork, according to the manual. The difference in volume is related to the anti-dive modulator on the left fork. Left and right references are as you sit on the bike.
You can use any 10 W 40 oil that is recommended for use in motorcycles.