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59096 · March 5th, 2019, 11:26 PM

Thanks to all those who posted on this. Carbs were cleaned ultrasonically and all passages and jets were blown through with compressed air before reassembly. The idle problem has now completely disappeared - the engine now reliably idles at 1500rpm with no hang up or variation. Very happy with this outcome. Two minor issues still remain which is a slight flat spot at around 4500rpm and the engine performance at the top end is slightly improved if the throttle is backed of slightly from full throttle. There are no holes or tears in the diaphragms but they could be suffering from age related stretching perhaps? Is that feasible?

March 5th, 2019, 11:26 PM	#15
59096 ninjette.org member Name: Garry Location: Bungendore Australia Join Date: Jan 2019 Motorcycle(s): GPX250 1989 model and 1990 model Posts: 98	Thanks to all those who posted on this. Carbs were cleaned ultrasonically and all passages and jets were blown through with compressed air before reassembly. The idle problem has now completely disappeared - the engine now reliably idles at 1500rpm with no hang up or variation. Very happy with this outcome. Two minor issues still remain which is a slight flat spot at around 4500rpm and the engine performance at the top end is slightly improved if the throttle is backed of slightly from full throttle. There are no holes or tears in the diaphragms but they could be suffering from age related stretching perhaps? Is that feasible?