skatefreak World Chat Champion
Joined: 06 Feb 2010 Karma :
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Posted: 11:10 - 21 Jun 2016 Post subject: To loud? :-( |
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Sooo,
I have an old CBR600 F3.
It came with a Yoshi and sounds the nuts.
I also have a stock exhaust for it and although its a lot quieter it really really kills the mid range.
After the first track day (had to ride home to swap the exhaust to stock, turns out our db meter is way out) I rebuilt the Yoshi to put a wider perforated steel pipe through the middle to fit a baffle in there.
This brought it down to 101 at the last track day but the chap there said it was close and may not pass on a dry day (it was raining at the time).
Soooooooo.
Is there anything more I can do with this pipe to quieten it down (can fabricate as I had to rebuild the entire steel internals in the pipe a few years back) without messing up the power delivery?
I'm still not 100% happy with the Yoshi with the baffle in there as it pops a lot and power delivery around the 5,000 range is very very choppy (holding constant power around a corner in the wet and can feel the back wheel squirm a bit).
Admittedly the carbs do need balancing (idles a bit choppy).
Alternatively, would this exhaust do the trick, bringing the noise level down without harming performance or am I going to have to consider looking in the carbs?
There are many drilled bolts on the frame of the bike (allegedly a sign on track use), so is there a chance the engine has been jetted for the exhaust and that's why using the stock exhaust seems to hit the performance so much?
Any thoughts would be very much appreciated
Can't wait for another dry track day |
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robertw95 Trackday Trickster
Joined: 22 Nov 2014 Karma :
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skatefreak World Chat Champion
Joined: 06 Feb 2010 Karma :
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Posted: 13:18 - 21 Jun 2016 Post subject: |
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My main concern is that the Yoshi was pretty badly corroded when I got it, so when I rebuilt it to the same specs, the internal tube was only around 28-30mm and that's far to narrow to get a standard baffle in there.
I'm yet to find a baffle for that model of yoshi |
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supZ World Chat Champion
Joined: 03 Feb 2009 Karma :
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