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#130177 drsierra (User) Fresh Boarder Posts: 2 BACKFIRE 2 Months, 3 Weeks ago   My 2004 VStar 1100 has 5,000 miles on it. All of a sudden it has developed backfiring, during acceleration, running, and deceleration. It also idles rough. I dumped the gas and replaced with new, but no change. It starts OK, but runs rough. Any ideas?   Logged     The administrator has disabled public write access. #130179 slyguy (User) Platinum Boarder Posts: 1268 Re:BACKFIRE 2 Months, 3 Weeks ago   Welcome to the Clinic. This is a Road Star forum, but anyway, did you mess with the jetting. Have you checked your spark plugs?   Logged       The administrator has disabled public write access. #130180 Akela (User) Ephesians 1:4-5 Junior Boarder Posts: 158 Re:BACKFIRE 2 Months, 3 Weeks ago   Sounds like an air leak, either on the intake manifold or the Exhaust. Check all bolts to make sure they are tight. Also, make sure all your vacuum lines are tight. I am not sure about the way its set up on a Vstar since it has 2 carbs, but on the Roadstar, there is a vacuum line leading from the carb to the airbox ... check to make sure that hasn't shaken loose first.   Logged     The administrator has disabled public write access. #130187 MS1700 (User) Expert Boarder Posts: 401 Re:BACKFIRE 2 Months, 3 Weeks ago   Yep intake air leak, I been wrestling with that for 12K miles, they finally fixed it Friday with some fabric washers around the bolt holes and it's back to old habits Monday, I got 800 miles of a RS running right and that's it. It acts like it's bad gas or choking because with the intake leaking, it's not drawing in the gas it needs, You can make it run better with Jetting and other ways but the root problem is an air leak IMHO. That's what mine is all about and I can't wait to get it sealed. All under warranty, but most of my riding time is back to the shop.   Logged     Experience is a tough way to learn ... because, you get the test first and the lesson afterwards.   The administrator has disabled public write access. #130191 Cougar (User) Platinum Boarder Posts: 2821 Re:BACKFIRE 2 Months, 3 Weeks ago   What the guys mentioned above.I use ether or quick start to look for leaks around my carb and manifold.Short quick bursts and see if the idle changes (no smoking ether is extremely flammable).You might also check your coils and wires when checking the plugs... .Coug   Logged       The administrator has disabled public write access. #130192 Rayjay (User) Senior Boarder Posts: 236 Re:BACKFIRE 2 Months, 3 Weeks ago   drsierra! Does it backfire out of the exhaust or carb(s)?   Logged     Ray   The administrator has disabled public write access. #130197 Clifford (User) Expert Boarder Posts: 548 Re:BACKFIRE 2 Months, 3 Weeks ago   With the engine idling spray starting fluid around the carb to manifold joint and all around the manifold. If you have a leak the fluid will be sucked in and the idle will change! If you do it with things cold and nothing happens, ride it enough to get it up to normal operating temperature and try again. Expansion when things heat up may make a difference between operation when cold or hot. If you don't find anything when checking the intake then try the exhaust. Check the pipe attachments to the cylinders, check the clamps at joints in the pipes, check for CRACKS in the pipes. Good Luck, Clifford   Logged     The administrator has disabled public write access. #130957 Rayjay (User) Senior Boarder Posts: 236 Re:BACKFIRE 2 Months, 3 Weeks ago   drsierra, what was the upshot of your problem? Did you solve it?   Logged     Ray   The administrator has disabled public write access. #131065 Curt (User) Never to old to ride! Platinum Boarder Posts: 3149 Re:BACKFIRE 2 Months, 3 Weeks ago   Like was said the VStar 1100 has two carbs and it sounds to me they are out of sync which will cause it to run and idle rough. It isn't like the R* that has one carb for both cylinders. I ride with a couple of guys who have the 1100's. Good luck!   Logged     Black Ice is Shinny, Black Ice is Deadly, Ya Wanna Ride My BlackIce?   The administrator has disabled public write access. #131591 drsierra (User) Fresh Boarder Posts: 2 Re:BACKFIRE 2 Months, 2 Weeks ago   Jave not messed with carb at all and the plugs are OK. The problem still ongoing.   Logged     The administrator has disabled public write access.

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