1978 GS 750 with 31k miles.
I have noticed a loss of power and a reluctance to rev past 5.5-6k rpms. I have cone air filters and 4-1 Kerker exhaust. It almost seems as if the air filters are restricted (haven't cleaned them yet). I did however drain the float bowls. Have performed valve adjustment within the past 6 months and installed ne plugs. Once warm it starts fine. No missing or backfiring. No unusual exhaust smoke. Idles as good as it ever did. Going downhill is the only time it seems easier to pick up rpms which suggests a compression issue to me? Have not found the time to do compression tests yet. What puzzles me is the abrupt change and not a gradual one which helps rule out plugged air filters. Carbs were also torn down completely 6 months ago and all float levels adjusted. All work done by myself. I realize some of the things I already mentioned may in fact be my problem but time is short and if anyone has any other thoughts I would appreciate you chiming in.
I have noticed a loss of power and a reluctance to rev past 5.5-6k rpms. I have cone air filters and 4-1 Kerker exhaust. It almost seems as if the air filters are restricted (haven't cleaned them yet). I did however drain the float bowls. Have performed valve adjustment within the past 6 months and installed ne plugs. Once warm it starts fine. No missing or backfiring. No unusual exhaust smoke. Idles as good as it ever did. Going downhill is the only time it seems easier to pick up rpms which suggests a compression issue to me? Have not found the time to do compression tests yet. What puzzles me is the abrupt change and not a gradual one which helps rule out plugged air filters. Carbs were also torn down completely 6 months ago and all float levels adjusted. All work done by myself. I realize some of the things I already mentioned may in fact be my problem but time is short and if anyone has any other thoughts I would appreciate you chiming in.
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