Reply To: GD250N – Hanging Revs and Stalling when Throttle opened quickly
It may sound silly, but can you get carb cleaner ?
And do this outdoors due to vapors! ==> Spray the intake system in different spots to see if revs change
If idle takes long to return to normal after a high rev = air leak or ISCV unit possibly (but another air-related sensor may be involved that’s on the throttle body such as TPS)
If if you quick twist throttle and it dies = Injectors (clogged or underperforming (wanning) ) or else the fuel pump is wanning? or else again intake system (throttle body and its ancillaries attached there)
Air filter should be clean if its a young mileage bike (if under 10,000 miles , air filter should be fine unless there is some unexplained damage to it)
Let me know if the above ^ even helped make slight changes (then we are getting somewhere)
If possible, remove harness => clean every single connector you can find (resistance or voltage loss can happen along the lines to make certain sensors on the bike perform less than optimal , in thus the ECU may not always overcompensate for this)
Also , test your stator (importat) and your regulator (way too important, probably the #1 electric device every one discards for a better one)
Battery should be new (where possible), as it’s 2025 , give her a fresh one and make sure it’s a genuine YUASA one (USA brand) , not too keen on other brands (chinese crappy cells)