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General Discussion / Re: Alternator replaced, now have issues with idle
« Last post by botus on March 19, 2024, 11:49:52 PM »
The idle is now quite irregular, and ends up stalling after a while; it recently started with around 2k rpm which then gradually decreased as the bike warmed up until it stalled. Failed to start again without opening the throttle a little.
It seems as though the system can't stabilise itself after the parts were changed or I appear to have missed something after completing the jobs.
Do I need to carry out an adaptations reset with the GS911? On that note, I do have a replacement tps on the way though I'm not sure if this is required.
Also, I've not yet carried out a throttle body synchronisation as I can't get a constant idle. Nor have the O2 sensors been checked or the valve clearances checked.
Many thanks
its won't be adaptions..... although real time values of the Engine and check long and short term trims to see how out of whack they look if you want
people like electrics and diagnostics to do the basics but they shouldn't
can't believe but seems MANY owners manage to get the throttle cable to sit stupid at the throttle body ends (after fiddling with the bike) and they run horrible - check both full open and close together - u see / feel it round the back (inside face) of each throttle body
next the bikes fuel pumps give up and they get weird on low fuel pressure - check, might be an outstanding free recall for a new pump - many this age got one (due to cracks and fuel leaks - or check history if it had one in less than 25k miles ought to be OK - buy pikey fakes off ebay for £40 they are better than OEM)
if that's not helped
1) I'd do the valve clearances - easy on either the older screw and lock nut ones OR the twin cam with spherical shims
2) then to ensure an easy life do a compression test if they are healthy and about equal
3) try carb balance using vac gauges with the throttle cable holding revs around 3k rpm on a hot engine - when correct turn off, snap throttle open and closed a few times re start and recheck
if that's not having it, coil stick failures is NORMAL but should be struggling to pull hard after 4k rather than idle issue