At bigger throttle openings the fault disappears. The throttle sensor was replaced because the FI light kept coming on although the bike was running well.
SOURCE: oil light
It would be best to have an oil pressure check. Get a reading at both idle and at 1500rpms.
Could be oil pump or bearings.
Bill
SOURCE: I need tuning specs for my 1982 suzuki gs 750.
You need to fix the fueling first - without fuel it won't run!
Your other problem sounds like an air leak - either the manifold or the carb. Check by spraying WD-40 or CRC at the manifold and carb join while the bike is running - if the revs change (either up or down) you have a leak.
SOURCE: 83 suziki GS450 idle issues
the problem with the rubber was close but on the gs450 there is a metal insert that even if the rubber was rotted away the metal seals aginst the head so it cant leak. the problem is on the gs 450 suzuki used a cheap throttle cable that kinks behind the gas tank and kinks at the bend to the crabs under the set and the throttle system is a pull only not a dual cable pull push to always close the throttle. if you start the bike a wiggle the bend in the cable that comes out from the twist grip you will see it changes the idle. with either your finger or a screw driver and push the plate down on the carbs that the cable connects too. if the idle drops this conforms your problem. order a new cable from dennis kirk they have the revised one that has metal adjustment screw and metal clip in. better jacket casing as well.
SOURCE: how to replace brake light bulb on burgman 400
On the earlier models there are two self tapping screws with x heads on the underside lip of the rear section you undo these and the rear panel lifts up and out on 2 plastic hooks built into the panel. (it feels like its not going to come off at times) you can then get to the bulbs I would replace both at the same time as the other one will go in a short time as the odds are they were fitted at the same time in the first place.
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