Question about Motorcycles

1 Answer

Who do I tune the bike now as I just installed a new exhaust system and it it back firing ?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 123 Answers

You should check the timing and make sure it is set right.

Posted on Apr 05, 2015

3 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 314 Answers

SOURCE: bike is back firing

Black smoke could be unburnt fuel .Check your air cleaner unit it may need a change .And also check that your plugs and you have a spark on all plugs .

Posted on Mar 17, 2010

Testimonial: "great advise. Thank you"

  • 4565 Answers

SOURCE: bike runs but back fires

You didn't say what year or model bike it is but I would guess, and that's all this is, that the rear cylinder is running lean for some reason. You may have an intake vacuum leak sucking air into the rear cylinder. That's my best guess.

Good Luck

Posted on Jun 02, 2011

Testimonial: "thanks that gives me one more thing to eliminate.appreciate it"

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Trouble shoot on a suzuki gsxr 1000 , loosing power after change out an after market shorty exhaust.

Hi, Anonymous power loss after an exhaust change is not uncommon if you don't change anything else like a performance air filter, this performance issue can usually be corrected by tuning up your carbs to meet the new air/fuel flow conditions, for more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Shorty exhausts who makes good one
Slip on and Full Exhaust System Shootout
Does Slip On Exhaust Add More Horsepower
Carb Tuning mixture ***** pilot jet explained
Info needed on running lean rich

Mar 30, 2016 | Suzuki Motorcycles

1 Answer

2003 harley davidson full dresser back fires or pops sound on the left side pipe when i let go the the gas handle at around 2000rpms it all started when i had new cams put in

Popping sound at the exhaust is usually due to a very lean setting which causes unburnt fuel to burn late in the exhaust pipe and happens when you are going at a high rpm with a closed throttle making it even leaner. My bike had the same problem and most Harleys are factory tuned lean which is very bad as the engine runs hot. After putting free flow Rhinehart pipes like i did, it became worst so i installed the Vance & Hines fuelpak and now my bike runs so silent and cooler. A great difference from before.

Jul 30, 2014 | 2003 Harley Davidson FLHTCUI Electra Glide...

2 Answers

Gsxr 750 shoots flames

If the bike was running correctly when it was put in storage two years ago, I would start with the easy things first: As the previous poster suggested, install new, correctly gapped plugs, along with a new battery. Your bike uses an electronic ignition system, and it will not opporate correctly if you have a bad battery. The bike will miss, pop, and backfire, because there is not enough electrical power in storage (battery) to properly run the ignition system.

If these two things do not get the bike running correctly you will need to look at the carbs. Was the bike stored with fuel in the tank and carbs? If so, this is the most likely reason for the bike not wanting to run correctly. Flames from the exhaust are an indication of a very rich fuel/air mixture (a float could be stuck open (it can also be caused by the ignition not working properly and allowing unburnt fuel into the exhaust system)). Cleaning and reassembling mulitple carborators is not that difficult if you are careful and reasonably handy, but tuning them properly can be very difficult. You can save a lot of money if you rebuild them yourself, then take the bike to the shop to be tuned (The standard service rate these days is around $75 an hour)

Mar 23, 2014 | 2000 Suzuki GSX-R 750

2 Answers

Just changed pipes and bike is back fireing

you need to remove your pair valve ,there is a guy called moccosin mike that sales them for i think 21 bucks,the pair valve is deff. whats causing the back fire

May 24, 2010 | 2003 Suzuki VL 800 Volusia

1 Answer

Cbr 125r 05 vibration

this new exhaust has thrown the engine way out of tune, and the carbs need to be re-set up as the bike is now running very week,,,,you will burn a hole in a piston very soon if you dont re-tune it,,,this could also be causing some if not all of the vibration your getting, but check the sprokets are running true life the rear of the bike clear of the ground and spin the rear wheel if you feel or here a grinding sound its the sprokets not meshing with the chain also did you have the new tyer balanced when it was fitted???
this also causes vibration

Mar 19, 2010 | 2005 Honda CBR 125 R

1 Answer

Any suggestions on a quieter exhaust system?

install a smaller motor
the reason it is so loud is that the motor is tuned to a certin back presure so exhause provides this
ask the dealer if they have a quieter exhaust designed for the bike they might and at least you sill get a solid answer

Aug 04, 2009 | 1995 Suzuki VS 800 Intruder

1 Answer

Can i block off one side of the exhaust with a plug and put a single slip on pipe

I would not advise doing that on your bike. Your exhaust is tuned for longevity from the factory and if you do not install a factory or aftermarket performance system you could have issues. Your back pressure will most likely be too much and then you run the risk of burning out your valves and your performance will suffer. If you do not have enough back pressure the bike may not have proper vacuum and it most likely will have difficulty idling.

Jun 14, 2009 | 2007 Suzuki GSX-R 1000

6 Answers

Exhaust air stronger and warmer on side than the other.

check out any blockage in the fuel  pump as its getting proper pressure to get started.

Jan 29, 2009 | 2005 Harley Davidson FLHTCUI Electra Glide...

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

13 people viewed this question

Ask a Question

Usually answered in minutes!

Top Motorcycles Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4514 Answers


Level 3 Expert

75817 Answers


Level 3 Expert

102366 Answers

Are you a Motorcycle Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides