Question about Honda VT 750 C2 Shadow Motorcycles

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The bike sits at idle and will pop in the exhaust, its runs fine off idle but the popping is annoying

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Chances are the valves need to be re-seated. This service is AKA "valve grinding". The head comes off then the valve retainers are removed then a grinding compound is smeared on the face of the valve seats and the valves get twisted left and right to remove carbon buildup and to give a fresh surface to the valve faces and valve seats. Please rate my answer. the bike sits at idle - c791c95.gif

Posted on Sep 09, 2010

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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...

1 Answer

2006 v star 1100 classic w/ vance + hines slip on exhaust. I get popping at idle and decel (i'm thinking it just needs to be rejetted). The big problem, is when the bike has already warmed up (at least 5...


The popping at idle and deceleration (when the throttle is in the idle position) could be a lean mixture at idle.
A lean mixture sitting at idle for a long light would cause the engine to run hot.
Also, as the engine reaches operating temperatures, the idle will pick up.

Oct 08, 2013 | Yamaha V Star 1100 Classic Motorcycles

1 Answer

Why do i have excessive exhaust popping on decel


If there are no intake or exhaust leaks, the main reason for decel popping is running lean. The EPA requires that the stock ECU (engine control unit) maintain a very lean A/F ratio (air to fuel ratio). By running so lean there is incomplete combustion and these gasses are ignited in the exhaust when they meet fresh air and the heat of the pipes. Bypassing the air injection system helps with some bikes, but rarely on the Vulcan 1700.

It may seem counter intuitive, but adding more fuel just off idle generally stops decel popping. The only way to do this on the Vulcan 1700 is with a good aftermarket fuel manager like the Power Commander V or the EJK Gen 3 controller.

Jun 10, 2012 | 2009 kawasaki Vulcan 1700 Classic

1 Answer

GSXR 600 K1 Won't start tries to fire up and the exhaust pops but that's all


Based off of the limited information, the solutions are going to be generalized.

Visually check your battery for any acid build up. If you spot any, obviously some acid remove would be called for. Acid can sap a battery's output to a starter.

Visually inspect fuel components. Fuel injectors on bikes tend to get clogged when they sit for a while. Especially on older models. Refer to a repair guide for your specific model for guidance on the procedure to inspect fuel injectors.

Those two common starting problems for bikes. Without more information it is hard to offer a specific solution.

May 29, 2012 | 2001 Suzuki GSX-R 600

1 Answer

With bike warm and choke off my 2002 crf450 pops on deacceleration. reves and runs exellent only on de aceeleration will it pop.


Popping during deceleration is unburned fuel igniting in the exhaust system. Four stroke dirt bikes are highly prone to this. However, you should be able to minimize the popping by restricting the air leaking into the exhaust. Replace the exhaust gasket in the head between the head and head pipe and the head pipe to the muffler. If there is no gasket between headpipe and muffler you may be able to improvise with a strip of fiberglass cloth

Sep 22, 2010 | 2004 Honda CRF 450 R

1 Answer

I have a 2005 harley FLHT that I have gpt the PO505 code. During cold starts the bike idles fine then after a restart it idles at 800 RPM. After driving for a good distance the idle will go back to 1000...


Hi Bjohnson16, popping, coughing, spitting, or backfiring through the carburator or induction module can be caused by air getting sucked in combustion chamber do bad intake seals leaking. Leaking exhaust gaskets can also be suspect. Remove air cleaner and backing plate, while engine is idling spray WD-40 or Brake Kleen around intake manifold to head area, if RPM's increase you have an intake leak and seals need to be replaced, also spark plugs will be burning whiter than normal. Good luck

Sep 04, 2010 | Harley Davidson FLHTCUI Electra Glide...

1 Answer

Changed exhaust did not rejet pops when ideling


If you went to a less restrictive exhaust and didnt rejet and the bike is popping its running to lean. Need to rejet the carbs when you open up the exhaust.

Jan 05, 2010 | 2001 Suzuki VL 1500 Intruder LC

1 Answer

Engine miss fires. tinny sound from exhaust. engine shuts down at or near idle.


Sounds as if the back pressure is making it pop when you shut it down. If the bike has know problems when Idling or running then don't worry about it.

Oct 14, 2009 | 2005 Honda VTX 1300 C

1 Answer

Pitbike cuts out after a few seconds,


mate you have the idle screw then there will be a mixture screw the mixture screw is the small screw on the carb unscrew it 1/4 of turns at time and see if it improves also you probz got water in the filter

Aug 25, 2009 | 1994 Bimota YB 9 SR

1 Answer

Lean pop or only runs on back cylinder and front back fires


Exhaust 'pops' is generally caused by unburnt fuel igniting in the exhaust, air leaks can cause this too.
When you do any carb work its always best practice to check the carb balance and idle mixture settings.
What colour is the spark plug? http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html

Jun 18, 2009 | 2005 Yamaha V Star Silverado

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