Juddering/spluttering between 6-8k rpm
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Juddering/spluttering between 6-8k rpm - 5/13/2008 5:56:55 AM
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kingo
Posts: 4
Joined: 5/13/2008
Status: offline
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hi folks,
hopefully someone can help, I have an M reg 600f and have found over the past year between 6k-8k rpm it seems like there is a momentary fuel starvation or blockage. I've ran some radex through on 3 full tanks but still no joy- still juddering in any gear. For long periods of a ride I also cant get over 9k rpm either :(
Any ideas??
cheers
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RE: Juddering/spluttering between 6-8k rpm - 5/13/2008 7:22:24 AM
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rrasco
Posts: 4703
Joined: 3/6/2006
From: San Antonio, TX
Status: offline
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Sounds like its bogging/choking then it picks back up at about 8K and takes off, right? I have this same problem, but I do know my carbs and idle need to be adjusted.
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RE: Juddering/spluttering between 6-8k rpm - 5/13/2008 7:53:49 AM
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kingo
Posts: 4
Joined: 5/13/2008
Status: offline
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yup, same issue...... hmmmmmmm
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RE: Juddering/spluttering between 6-8k rpm - 5/13/2008 8:05:36 AM
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Gogar
Posts: 237
Joined: 9/4/2007
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It's possible your main jet size is a little too big. 6-8k rpm is the spot where the main jet comes into play, and when it starts pouring a little bit too much gas into the engine, you get that temporary bog and then it catches and continues to the top.
If your bike has Dynojet needles or something, it's also possible that the clips are a position or two too low, and the slide pulls the needle up out of the way of the main jet too early, and you're too rich in the beginning of the main jet curve.
Has the bike ever run right for you?
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RE: Juddering/spluttering between 6-8k rpm - 5/13/2008 9:07:26 AM
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rrasco
Posts: 4703
Joined: 3/6/2006
From: San Antonio, TX
Status: offline
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I've always had minor bogging issues. Nothing that makes it un-ridable, just normally better if you shift before 6K for commuting anyhow. When you need it, just throttle up.
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http://www.snackbar-games.com - Your Games, Your Site, Your Community
-You dumb bastard, its not a schooner, its a sailboat!
CBR Forum Buddy: txn_driver
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RE: Juddering/spluttering between 6-8k rpm - 5/13/2008 9:22:35 AM
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dalex
Posts: 71
Joined: 1/27/2008
Status: offline
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I used to have the same issue. Can't pinpoint exactly what fixed it but cleaning the carbs, re-adjusting the pilot screws, a small dose of seafom, blocking the brass tubes next to the intake boots on the carbs and blocking half of each air-intake holes on the frame completely eliminated the bugging. In my case, part of the issue was caused by main jets being too small (hence covering half the air-intake). I now have larger mainjets ready to be installed but will only replace them once I'm ready to do a sync as well.
I would start by cleaning the carbs and take a reading on your spark plugs as well. In the process you can see what jets/needles you have now. It will give you a better idea on which way to go from there.
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