F4i lumpy at 1000rpm - 4000rpm
Any possible ideas please. I've got a cbr 600 f4i and has started to run lumpy at low rpm. Once over 4000 it's fine and pulls no problem. It's like the bikes in too high a gear and not smooth at all. First thought the battery as this had died twice but changed that and no better. Thinking now pluggs or rectifier? Also put pb ultima fuel in a full tank ago so thinking it might not like it. Anyone else have the same problem?
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First of all get red of any suspect fuel and fill in 95ron plus gas. I'd check the fuel pressure regulator before touching the plugs. Do a leak test. Pretty straightforward. Look up videos on YouTube.
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are you riding at 1-4k rpm? or does it idle funny? if you're riding, then of course its gonna feel like you're in a very tall gear, you've got zero power at that low of RPM.
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Originally Posted by sjona2011
(Post 1307657)
are you riding at 1-4k rpm? or does it idle funny? if you're riding, then of course its gonna feel like you're in a very tall gear, you've got zero power at that low of RPM.
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Originally Posted by lifeboatman3
(Post 1307702)
Idle is fine and revs fine in neutral just no good under load . it's when your going round town and if you come down to a 30mph zone and then power up its no good. As soon as you get to 4000 rpm it's pulls all the way with no problems.
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Agree...Below 3k rpm I start feathering the clutch if I cant downshift
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Originally Posted by SunBlue
(Post 1307815)
Agree...Below 3k rpm I start feathering the clutch if I cant downshift
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