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Author Topic: Why not different sized jets for cobra pipes?  (Read 1570 times)
Cinco
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Posts: 3


« on: October 01, 2009, 07:21:16 AM »

Did some searching, and found that with the cobra 6 to 6 pipes, the only problem with jetting is that the pipes are different lengths, and jetting does not really match what is needed.  Why not vary the jetting, to match the pipes?  I have jetted numerous inline 4 engines, and have varied the jets based on inside/outside or exhaust routings.  Unfortunatly for me I don't have a big assortment of jets to try out, unless they might be the same as the ones for my kaws, but most of the ones I have would probably be much larger anyway.  Maybe I'll start gathering an assortment now.....  Has anyone tried staggering jets?
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98valk
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Posts: 13487


South Jersey


« Reply #1 on: October 01, 2009, 07:56:25 AM »

unless u let in more air, no need for more fuel.

http://www.valkyrieforum.com/forum/tech_archive.cgi?read=969520

This was posted by J. Orr, 3/27/1998, on the GWRRA BBS, valkyrie section.
The following mods were done by Marc the owner of Factory Pro of a valkyrie that had cobra 6x6 pipes.
K&N filter (w/o prefilter)
Air box mod (remove plastic welded baffle)
38 pilot jet
3.5 turns idle mixture screw
front needles set on #3
mid and rear needles set on #2
115 main jets all carbs
this picked up 5 hp over the base run with the cobras.

this HP is still down from the stock pipes or almost the same.
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C  10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp

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Slammer
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Posts: 215

Lafayette,La.


« Reply #2 on: October 01, 2009, 01:15:33 PM »

the last 7 or 8 years. I always put the stock needles and springs back in  first thing. Always set the pilots at 2.25 turns out. They run good and get decent mileage.
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