Dangle_kt
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| posted on 22/4/09 at 02:48 PM |
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blade engine, revs die off REALLY slowly - with video
http://www.youtube.com/watch?v=7ZSfo3XPQnU&feature=channel_page
Ignore my stupid ramblings, the only bit I say of any use I get wrong due to nearly fainting from the fumes! 
The throttle moves cleanly, but the revs don't die down.
If you listen to it when I blip the throttle it sounds like I'm trailing the throttle, but I'm not - i'm straight on it, and
straight off again.
Any ideas?
I know at least one of the exhaust downpipes has a bad seal to the head and I know that my air box is not on quite right (with one trumpet not sealing
with the airbox)
Cheers for the advice.
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adam1985
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| posted on 22/4/09 at 02:55 PM |
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i havent a clue sorry but when you take your foot of the accelarator does the pedal return straight away or does it slowly return up
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YQUSTA
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| posted on 22/4/09 at 02:59 PM |
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return spring fitted?
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Dangle_kt
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| posted on 22/4/09 at 03:03 PM |
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yup return spring is fitted, pedal jumps right back up.
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dan__wright
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| posted on 22/4/09 at 03:06 PM |
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cant make out in the vid, are you revving it using the accelerator or the linkage on the carbs / throttle bodies? if is using the pedal try it direct
on the carbs / throttle bodies.
i kept getting missed gears on my zx10 as the revs wernt dropping off quick enough, a load of 3 in 1 down the throttle cable and it feels much better
and doesn't miss!
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andrew.carwithen
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| posted on 22/4/09 at 03:16 PM |
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Just a thought....
The choke slide mechanism on the carbs isn't in the 'on' position, by any chance?
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Peteff
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| posted on 22/4/09 at 03:43 PM |
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quote:
Originally posted by Dangle_kt
yup return spring is fitted, pedal jumps right back up.
Is the return spring fitted to the pedal or the carb linkage ? If it's just the pedal returning quickly it doesn't necessarily mean the
carbs are closing. It needs something in place of a return cable as fitted to the bike throttle.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Dangle_kt
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| posted on 22/4/09 at 04:52 PM |
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spring is on the return cable. hmmmmm
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Andy B
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| posted on 22/4/09 at 04:55 PM |
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Just listened to the video and I reckon that sounds like the carbs are well out of balance so that although one carb is shutting the others are
falling off later and holding rpm up. A good balance up[ will crispen things no end.
Hope that helps
Andy
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mad-butcher
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| posted on 22/4/09 at 04:56 PM |
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Don't forget the cable only controls the butterfly's. the needles are on the slides and diaphrams so if the breather is blocked the
diaphram will hold a slight vacuum. jap bike carbs work very much like the old stromberg.
tony
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Gav
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| posted on 22/4/09 at 08:28 PM |
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I had a similar problem with my 893 that the throttle wasn't retuning properly. there was about a 1mm gap left between the throttle stops on the
cable holder which i could close manually and the revs would instantly go down, fitted a bigger return spring on the opposite side of the cable holder
and it works a treat 
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Dangle_kt
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| posted on 22/4/09 at 09:14 PM |
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Thanks guys.
I am sure the carbs will be WAYYYYYY out, I'm also sure a stronger spring will help.
Thanks guys.
It will limp me to an SVA fail which is all I'm after.
I'll sort all this after I have 6 months grace
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