|
Lt.Gene
|
 |
« on: September 15, 2010, 08:08:57 PM » |
|
Hoping someone could enlighten me on how to tell if my carbs were altered for Cobra 6 into 6 exhaust. Bought my '99 interstate five years ago with the 6 into 6 pipes but was a bit too loud for the long haul trips I make and the mileage was poor. Installed OEM pipes but the mileage is still poor. Just completed an 800 mile cruise around easter Nevada, Hwy 50 and averaged 28.57 mpg with a cruising speed of 65-70, one up riding. I have read in other postings of '99 Interstates averaging mileage into the mid to high 30's. Wondered if the carbs were modified for the 6 into 6 exhaust. Thanks for any help.
|
|
|
|
« Last Edit: September 15, 2010, 08:16:03 PM by Lt.Gene »
|
Logged
|
|
|
|
|
Warlock
|
|
« Reply #1 on: September 15, 2010, 08:29:52 PM » |
|
They probably still have needles that most people use when running the Cobra pipes. Check and see if the needles are adjustable. If so they are after market needles. You need to find the stock needles and put back in the carbs. This should give you some gas mileage back. JAT
David
|
|
|
|
|
Logged
|
 I don't want to hear the labor pains, I just want to see the baby |
|
|
|
daytona
|
|
« Reply #2 on: September 16, 2010, 04:09:32 AM » |
|
unless its running crapy I think you need to tame the throttle wrist. 29 per ain't that bad!
|
|
|
|
|
Logged
|
Just started!  |
|
|
|
Ricky-D
|
|
« Reply #3 on: September 16, 2010, 09:15:08 AM » |
|
Less than 30 mpg is indicative of some carburetor fiddling.
Especially keeping it in that cruising range.
Stock needles and back to stock jets should get you back to, or close to 40 mpg.
***
|
|
|
|
|
Logged
|
2000_Valkyrie_Interstate
|
|
|
|
Lt.Gene
|
|
« Reply #4 on: September 17, 2010, 10:57:42 PM » |
|
Thanks for the information and direction. I shall have the carbs re-checked. Thanks to all.
-g
|
|
|
|
|
Logged
|
|
|
|
|
Robert
|
|
« Reply #5 on: September 18, 2010, 10:31:18 PM » |
|
Usually with the Cobra kits they do run rich, check the plugs they should be light gray to white if not adjust the needles. Sometimes the second notch is to lean and the third notch to rich at that point use a shim. Also not entirely sure but usually on those kits its just needles no jets. So you wont need to pull the carbs, just make the needle adjustments easy and quick to do.
|
|
|
|
« Last Edit: September 18, 2010, 10:38:29 PM by Robert »
|
Logged
|
“Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don’t have time for all that.”
|
|
|
|
Lt.Gene
|
|
« Reply #6 on: September 20, 2010, 09:30:46 PM » |
|
Great Info, and not to sound to inept, but how do I check or adjust the carb needles? I have the shop manual, but no info came with the bike when purchased five years ago. In reading a post here, I would prefer not to remove the tank etc, I did all that when I installed the Audiovox cruise control, don't really want to do that again if I dont have to. Thanks again
|
|
|
|
|
Logged
|
|
|
|
|
Ricky-D
|
|
« Reply #7 on: September 21, 2010, 08:24:37 AM » |
|
You can pull the tower off the easiest carburetor and look to see if the needle is an aftermarket type or a stock needle. Stock needles are non-adjustable.
You can also remove the float bowl on the easiest carburetor and inspect the jets for other than stock. It may take a little intuitive work but it is possible.
The biggest danger is screwing things up, so if you are hesitant take it to the dealer for inspection. The dealer ought to be able to tell you if the parts are stock or not and it should not take much time since only one carburetor needs to be looked at. Depending on the dealer you may have to insist only one carburetor be looked at. Should take less than one hour sure.
***
|
|
|
|
|
Logged
|
2000_Valkyrie_Interstate
|
|
|
|
Robert
|
|
« Reply #8 on: September 21, 2010, 05:20:39 PM » |
|
Needles can be checked without taking the tank off just by taking out the four screws on the top of the carb lifting the damper out and checking the needle. If you take the black center that has a screw fitting in it inside the damper it will release the needle so you can check to see if it has grooves. If it does its not factory. Look at the shop manual to get a better understanding
|
|
|
|
|
Logged
|
“Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don’t have time for all that.”
|
|
|
|
Lt.Gene
|
|
« Reply #9 on: October 26, 2010, 07:53:22 PM » |
|
Just to follow up on the original issue--I had the carbs inspected and the mechanic found aftermarket needles which I changed out for OEM needles. Went on a 300 mile trip with friends and got an amazing 43 mph over mountain roads and some interstate driving. Quite happy with the mileage now... Thanks to all for yur input on this topic.
-g
|
|
|
|
|
Logged
|
|
|
|
|
