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adjusting the fuel



Hi Guys
Just wondered how can you tell/ do you know when you have adjusted the fuel
screw correctly on the injector pump to get the right balance between power
and emmisions.
I know it only takes a little adjustment on this screw but how do you know
when you get it right without the use of an emmisions tester etc.
I also know that if you give too much fuel you will wreck the engine so is
it a hit and miss situation or something that should be left to the guys
with the machines.
john 92HDJ 80 1HDT