Hi,
Are you sure your bike is a 1VJ? My 1988 Tenere is a 3AJ (Twin headlight fairing)
Gravity will supply most of the fuel from the tank so you could bypass the fuel pump and see it things improve. But remember you will no longer be able to use reserve and your range before reaching reserve will be a little reduced.
It could be fuel going state in the carb’, for some reason it goes off here much quicker than in the petrol tank. If the bike is not going to be used again for a week or more, try turning the petrol taps off just before you reach home so that the last couple of minutes ride empties the float chamber. Then when you next come to start it, open the petrol taps and fresher petrol is available to start the bike. If you do not turn the petrol taps off at the end of a ride, doing so may also help
Using an iridium tipped plug may also help. They are three times the price of a regular plug but they do last 3 times as long, and you only need one.
Hope you sort it,
Mark
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