1998 zx9r - ZX Forums
 
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post #1 of 2 (permalink) Old 09-05-2019, 05:07 PM Thread Starter
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Justin Qualls's Avatar
 
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1998 zx9r

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16 minutes ago ∑ #1
1998 zx9r
I recently started having issues when the throttle is barely cracked as well as a flutter between 4500rpm and 5000 rpms. What’s baffling me now is that it seems to run great for the first few miles and progressively gets worse. It idles flawlessly and never dies or stalls. The range just expands downward . Still clears up just around 5k rpm but starts the fluttering at a lower rpm. Around 2600, after driving for a few miles or when the throttle is just cracked. From my few point, at low throttle, the bike gets more lean as I drive it and will remain that way till the bike cools off a little. Can someone tell me what would make a bike lean out as I drive it? HELP
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post #2 of 2 (permalink) Old 09-10-2019, 05:06 AM
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Sounds like ur valves need adjusted. My zx11e used 2 do that. Itd idle fine. But when running it wouldnt pick up the 4th cylinder til 1/2 throttle or high rpm. Got progressively worse to the point where itd idle on 2 or 3. Wouldnt get the 4th til 3/4 throttle or 130mph. I had 5 valves hanging open by then. And adjusted 13 of them. So try valve adjustment and carb sync after. Go thru fuel/air/exhaust n make sure everything is clean/tight/leak free. Stupidly small things can stack up sometimes
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