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Heinno
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« on: February 19, 2011, 10:55:19 PM » |
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Just a question on the air/fuel mixture when installing a set of cobra pipes.
If one have installed a set of Cobra pipes, without rejetting the carbs, what is the recommended setting for the air/feul mixture - just leave it as is? Or how many screws out?
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Momz
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« Reply #1 on: February 20, 2011, 06:55:02 AM » |
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Just install the Cobra jet needles (simple).
Or for maximum perfotmance there are other options: Factory Pro jet kits, Dail-a-jet kits, etc.
Adjusting the air/fuel ratio screws to OEM specs and a carb sync will make any motor run better, but won't fix a lean condition caused by changing pipes.
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 ALWAYS QUESTION AUTHORITY! 97 Valk bobber, 98 Valk Rat Rod, 2K SuperValk, plus several other classic bikes |
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bikerboy1951
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« Reply #2 on: February 20, 2011, 01:01:53 PM » |
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I purchased an '01 standard (6125 miles) with Cobra pipes. I changed the springs to Interstate springs and while doing so, decided to check the needles and spark plugs. The needles were the stock ones (J6KJ). When I pulled the plugs, they were very brown (rich condition). I pulled the tank and air box to do the desmog and it had the stock filter.
At least for my bike, putting on different pipes did not cause a lean condition. I would do some investigating before replacing the needles. The lean condition does not seem to hold true for all bikes when replacing exhaust systems.
Brad
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Chrisj CMA
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« Reply #3 on: February 20, 2011, 01:25:28 PM » |
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I purchased an '01 standard (6125 miles) with Cobra pipes. I changed the springs to Interstate springs and while doing so, decided to check the needles and spark plugs. The needles were the stock ones (J6KJ). When I pulled the plugs, they were very brown (rich condition). I pulled the tank and air box to do the desmog and it had the stock filter.
At least for my bike, putting on different pipes did not cause a lean condition. I would do some investigating before replacing the needles. The lean condition does not seem to hold true for all bikes when replacing exhaust systems.
Brad
I too bopught a Valkyrie with Cobra pipes already installed. The dealer I bought from said he was going to rejet it, but found it to be running perfectly so he didnt. I rode it like that for a long time even though I suspected it to be a tad rich (like yours) after going with a K&N filter WITH the prefilter all is perfect |
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #4 on: February 20, 2011, 02:08:28 PM » |
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heinno.......the cobra needles suck....stay with the TOJO-HONDA needles. i have a tourer with cobra pipes, and here is what works for me: interstate ecm/interstate springs/6-degree trigger wheel/ 105 main jets/ 38 slow jets/fuel-air screws out from stop=1 1/2 turns. plugs look great/runs great. fuel mileage=39-42.  |
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Heinno
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« Reply #5 on: February 20, 2011, 05:29:47 PM » |
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heinno.......the cobra needles suck....stay with the TOJO-HONDA needles. i have a tourer with cobra pipes, and here is what works for me: interstate ecm/interstate springs/6-degree trigger wheel/ 105 main jets/ 38 slow jets/fuel-air screws out from stop=1 1/2 turns. plugs look great/runs great. fuel mileage=39-42. so what gas mileage does other guys get with the Cobra pipes - what changes did you guys make to your bikes. Also, does the bikes perform the same with the Cobra's baffles in and out? |
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #6 on: February 20, 2011, 07:20:13 PM » |
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heinno....../performance wise, maybe a tiny little bit better with the baffles in (with the baffles in it doesn't ever pop.) with the baffles out - about the same, but does occasionlly pop on decell. mpg is about the same with or without. |
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Heinno
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« Reply #7 on: February 20, 2011, 07:55:47 PM » |
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yea, tested mine a bit today - just a bit of a flat spot on starting to open the trottle, but once it kicks in it seems fine. I did not hear any popping with the baffles in on decel, but did notice that she pulls smoother when she is hot - before she was pulling smooth from the start and had no flat spot.
So best options for cabra pipes is:
6 degree trigger
K&N Filter with prefilter
38 slow jet
105 main jet
air/feul screws - out 1.5 turns
baffles in
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #8 on: February 20, 2011, 08:01:56 PM » |
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heinno....this set-up works for me.
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Heinno
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« Reply #9 on: February 21, 2011, 10:52:28 AM » |
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heinno.......the cobra needles suck....stay with the TOJO-HONDA needles. i have a tourer with cobra pipes, and here is what works for me: interstate ecm/interstate springs/6-degree trigger wheel/ 105 main jets/ 38 slow jets/fuel-air screws out from stop=1 1/2 turns. plugs look great/runs great. fuel mileage=39-42. Any idea on the part number for the interstate springs? |
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bikerboy1951
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« Reply #10 on: February 21, 2011, 01:18:49 PM » |
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HDL has them listed under OEM parts. Their number is HO-6080311X6. The price is $14.99.
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