I was thinking about running open exhaust on my 82 DOHC CB. I was wondering if there would be some additional jetting/tunning that would need to be done to run an open exhaust system? The exhaust I am running now is aftermarket 4into1.
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Running open exhaust
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 colzee.hondachopper |
Running open exhaust |
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Posts: 4 (04/07/08 11:41:44) |
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freebyrd78 |
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Posts: 1962 (04/07/08 11:56:59) S.O.B. |
You will no doubt have to rejet. While a 4-1 system has less back pressure than a standard exhaust, the open pipes will have even less. With the factory
exhaust and airbox, the needles were turned out 1 1/2 turns and the jets were 68 and 102. With pod filters and a 4-2 exhaust, we run the needles at 3 /12 turns
out and jets of 75 and 110....so maybe that will give you an idea.
freebyrd |
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colzee.hondachopper |
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Posts: 5 (04/07/08 12:17:06) |
Yeah that gives me a good idea. I need about another turn out at least, but that gives me an idea of where I need to be. Thanks for all the help and fast
response Freebyrd. You have been a huge help. My chop is almost finished I will post some picts when it is done. Thanks again.
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Oldie |
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Posts: 84 (04/07/08 13:14:08) |
Ah freebyrd to the rescue again.LOL Oldie
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wornoutdan.hondachopper |
exhaust | ||
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Posts: 12 (04/10/08 16:03:06) |
I have straight pipes factory ,short the motor runs great now so it must be jetted I have no desire to dismantle to see when it`s running so great. One
question ya`all might know the answer to is-- In Pa I need inspection I bought some JC Whitney baffles to put in the pipes that I have not done yet. Will those
baffes affect the jetting?--I plan on removeing them as soon as I get home. I like the noise. Thanks much
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freebyrd78 |
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Posts: 1963 (04/10/08 16:34:16) S.O.B. |
anytime you affect the amount of back pressure in an exhaust on a bike you'll have to make changes. Unlike a car, bikes are ver sensitive to changes in the
air/fuel mix.
freebyrd |
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mstspot |
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Posts: 269 (04/10/08 20:11:07) |
The extra back pressure should just make it run rich which is never a bad thing on a bike anyway. So ya think those little baffels that they sell will make it
purr like a kitten, I got alot more baffeling than that on my shorties and they leave plenty of space behind me when we are riding, my whine drives out their
thump thump
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wornoutdan.hondachopper |
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Posts: 13 (04/20/08 15:29:47) |
I just want to use them for the inspection , and back out they come I like the noise.
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