Announcement

Collapse
No announcement yet.

Backfiring though carb and pipes

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Backfiring though carb and pipes

    I have a 1999 Yamaha 1600 that just started running like crap. It started up fine. Then while riding it started backfiring through the pipes. It would hesitate a little while backfiring. The bike would run a little better at higher rpm but I could still hear a slight backfire through the pipes. I took it home and cut it off. After a few minutes I tried to start it again. On the first crank it sputtered and quit and black smoke blew out of the carb. Any ideas?

  • #2
    Check intake manifold for leaks with ether...

    Comment


    • #3
      Also if the AIS has been removed check the vacuum cap on the intake manifold nipple. They only last a year or 2 and crack or fall off causing a big air leak.

      Comment


      • #4
        If your online name is your email address as it looks, I suggest you get rid of that.

        Comment


        • #5
          Good idea Shores. What is an AIS?

          Comment


          • #6
            Instead of a vacuum nipple I use fuel injection line , not fuel line. Fuel injection line is tougher. I even use a cutoff galvanized nail or a bolt with threads cut off and a couple of clamps keep it lightweight though, and as short as possible, or, you can make it long and zip tied to something else, but you don't want to vibrate all over the place and tear up your intake manifold like a pendulum

            Comment


            • #7
              Also check for a cracked coasting enrichening cover.

              Comment


              • #8
                I've looked over these parts and cleaned the carb. It helped a little bit but I still have a bit of a backfire

                Comment


                • #9
                  I just went through this myself and I needed to adjust the mixture screw. It's on the bottom rear of the carb as you're looking at it.

                  Comment


                  • #10
                    Originally posted by [email protected] View Post
                    Good idea Shores. What is an AIS?
                    The AIS is an Air Injection System that injects air into the exhaust ports to help burn any unburned fuel in the exhaust. It is just emission crap that everyone removes. The AIS will also cause popping on decel especially with aftermarket pipes.

                    Comment


                    • #11
                      As you guys know I just got a trike last week. And I had the remove my fifth or six AIS system off of Yamaha
                      Yamaha. This one has been on for 20 years so I got them loose where they would spin and I shot oil in the cracks, but it wasn't until I shot oil inside of the fittings, then I just popped right out. I'm sure the oil spray inside the fittings seeped into the cracks by wicking or otherwise known as capillary effect. I mean they were dogs they weren't going anywhere except 30° to the left 30° to right once I put that oil on inside up into the tube, they popped right off. I I don't think that's in the our AIS removal procedure file

                      Comment


                      • #12
                        The AIS fittings that I have removed from 1600's I drilled and tapped a hole in the center of the fitting to the thread size on my slide hammer and they come right out with a couple slides of the hammer.

                        Comment


                        • #13
                          I will be busy with work until Friday but I will check this out and see how it goes!

                          Comment


                          • #14
                            So I checked the spark plugs. They looked a bit crappy so I replaced them. I will see where that gets me tomorrow. Got a buddy that is well versed on the mechanic side of the 1600s so he will take a look tomorrow and see what he can do.

                            Comment


                            • #15
                              Black plugs matter. Also worn out or electrodes will definitely affect your snappiness of acceleration

                              Comment


                              • #16
                                Ok so I changed the plugs last night and took her out for a ride. Everything is running fine now. I still think I'm running a bit rich on fuel tho.

                                Comment

                                Latest Posts

                                Collapse

                                Topics Statistics Last Post
                                Started by Rilcoat, 2 days ago
                                11 responses
                                116 views
                                0 likes
                                Last Post Rilcoat
                                by Rilcoat
                                 
                                Started by Rilcoat, 2 days ago
                                17 responses
                                118 views
                                0 likes
                                Last Post Rilcoat
                                by Rilcoat
                                 
                                Started by zert800, 8 hours ago
                                0 responses
                                40 views
                                2 likes
                                Last Post zert800
                                by zert800
                                 
                                Started by AZRoadie, 3 days ago
                                4 responses
                                118 views
                                0 likes
                                Last Post EP Roadie  
                                Started by TexFer, 12-30-2020, 10:46 AM
                                32 responses
                                520 views
                                0 likes
                                Last Post TexFer
                                by TexFer
                                 
                                Started by Rilcoat, 1 day ago
                                3 responses
                                59 views
                                0 likes
                                Last Post Rilcoat
                                by Rilcoat
                                 
                                Started by Lug Nut, 1 day ago
                                2 responses
                                98 views
                                0 likes
                                Last Post boomerA
                                by boomerA
                                 
                                Started by roadiemort, 1 day ago
                                7 responses
                                118 views
                                1 like
                                Last Post boomerA
                                by boomerA
                                 
                                Started by Duke, 2 days ago
                                11 responses
                                108 views
                                2 likes
                                Last Post Lug Nut
                                by Lug Nut
                                 
                                Started by Lug Nut, 1 day ago
                                0 responses
                                50 views
                                0 likes
                                Last Post Lug Nut
                                by Lug Nut
                                 
                                Started by roadiemort, 2 days ago
                                3 responses
                                88 views
                                0 likes
                                Last Post roadiemort  
                                Started by MikeyC, 2 days ago
                                1 response
                                38 views
                                0 likes
                                Last Post Ahodge75  
                                Started by MikeyC, 12-05-2020, 08:08 PM
                                89 responses
                                1,034 views
                                0 likes
                                Last Post Ahodge75  
                                Started by roadiemort, 2 days ago
                                0 responses
                                63 views
                                0 likes
                                Last Post roadiemort  
                                Started by Lug Nut, 2 days ago
                                3 responses
                                32 views
                                0 likes
                                Last Post Shores
                                by Shores
                                 
                                Started by BC1955, 4 days ago
                                6 responses
                                118 views
                                0 likes
                                Last Post MikeyC
                                by MikeyC
                                 
                                Started by Easy Rider77, 1 week ago
                                16 responses
                                234 views
                                0 likes
                                Last Post MikeyC
                                by MikeyC
                                 
                                Started by BC1955, 4 days ago
                                8 responses
                                149 views
                                0 likes
                                Last Post BC1955
                                by BC1955
                                 
                                Started by BC1955, 3 days ago
                                7 responses
                                88 views
                                0 likes
                                Last Post Bikerron  
                                Working...
                                X