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xs650 > > Motorcycle Systems > > Fuel > > stock jetting for aftermarket exhaust?? |
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stock jetting for aftermarket exhaust??
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benztech Full Member
Joined: Sep 01, 2009 Posts: 62
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Posted: September 9, 2009, 9:22 pm Post subject: stock jetting for aftermarket exhaust?? |
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My 75' came with a kerker 2-1 exhaust. I'm not running the megaphone as it fell off on the highway about a month ago. So basically I have just pipes and nothing else. (I run the stock airboxes with new filters from mikesxs)
I got the PAMCO, new advance springs, timing is set and valves are in spec.
here is my issue. I get a 2500rpm dead spot. bike will sputter till about 3k and then she'll pull out of it. the bike will start first kick, idle all day, but I get that dang dead spot and I feel a lack of power going WOT. I also getting backfires going WOT and letting off the throttle. following the carb guide, everything is stock in the carbs and set to factory. I bought an NOS carb rebuld kit and it came with a float guage and I set the floats correctly.
i'm assuming I need more fuel, but when I pull the plugs they look rich. any info would be great.
FYI, I have lambda gauge and i'm tempted to rig that sucker to my bike.
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schtipp Full Member
Joined: Jul 14, 2009 Posts: 81 Location: whitehall, pa
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Posted: September 18, 2009, 10:07 am Post subject: Re: stock jetting for aftermarket exhaust?? |
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try moving the c-clip one slot leaner on the needles
_________________ if it's running, ride it... |
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yamaman Support Staff
Joined: Jan 04, 2007 Posts: 1638 Location: Perth Western Australia
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Posted: September 18, 2009, 11:14 am Post subject: Re: stock jetting for aftermarket exhaust?? |
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Was it running well before your exhaust dissapeared?
Some set ups are just untuneable, fix you exhaust first!
_________________ Its not enough to have an aim in life, you have to pull the trigger! |
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woodman Full Member
Joined: Oct 12, 2008 Posts: 256
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Posted: September 29, 2009, 1:40 pm Post subject: Re: stock jetting for aftermarket exhaust?? |
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leaner ?
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gordo 650Rider Supporter
Joined: Oct 09, 2008 Posts: 559 Location: CT.U.S.A.
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Posted: September 29, 2009, 4:25 pm Post subject: Re: stock jetting for aftermarket exhaust?? |
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woodman, try bringing the needle up a notch. The stock pilot jet work's through the whole rpm range, but on the transfer stage(about 2000-2500rpm) is when the diaphragm's start to lift. And above like5000, your running on all three, pilot,slides full open, main jet. I would try one notch richer first. If it gets better, go one more. And vise- versa. But as yamaman stated, you should get a muffler,for your own ear's sake.
_________________ '80 G, |
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woodman Full Member
Joined: Oct 12, 2008 Posts: 256
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Posted: October 8, 2009, 8:25 pm Post subject: Re: stock jetting for aftermarket exhaust?? |
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Schtipp said to make it leaner, raising the needle is richer {lowering the clip}, raising the clip, is leaner {lowering the needle}, I agree with you
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