Popping on deceleration

[tulaw]

I've been following some of the problems others have had with stalling. I'm at 1000 ft above sea level, no problems like that yet -- 1,000 miles on the odometer. I am curious, though, about backfire/popping that ocurs during deceleration (mostly rapid deceleration). There are times I get several; some times one or two pops; others none at all. Is this common or to be expected? Is it a problem to address?

[ropal]

My 500 also did this when first purchased but after 1000 miles of windnoise I purchased a set of custom made ear plugs, whala-no more deceleration popping noise, what a country. It still may be making the popping noise but I do not hear it now! Out of sound out of mind I quess.

[cmsdms]

I would not worry about it at all. All new bikes do it to some degree because of the emissions. It is probably caused by what is called the air injection system. It pumps cold air into your exhaust to burn up any residual fuel. You can probably disconnect it but you would have to make sure that your vacuum was not compromised. Ypu should hear my new Yamaha on deceleration.

[webwalla]

I'm one of the people that had stalling problem when coming off a run on the interstate on a 70deg plus day at 5-6000ft altitude.

I eventually realized, popping was the first clue that it is almost at the point where it will stall.

I'm testing a "fix" at the moment, which involved disconnecting 2-3 emission hoses and plugging them up. I've had one chance to ride 30 miles at 70mph for about 30min with temp around 72. It worked perfect. One more trial like that and I'll say it's "fixed"... it didn't pop either.

I agree it's the emissions and wouldn't worry about the popping.

[ralphp]

I was getting this quite a bit, then realized I was supposed to be using 97 octane gas. That made a significant difference. Still get the problem sometimes, especially after sustained operation at higher speeds and then a transition to stop-and-go driving.

[bigbob313]

I've read there are two standards for rating octane. The highest I've found available at the pumps (in Phoenix, Arizona) is 91. Other than avaition gas, and "racing" gas; where do you find 97 octane? :rollin:

[ralphp]

Sorry, my bad. I did mean to type 91 octane. :smokin:

[bccatl2]

Amaco and BP/Amaco highest grade is 93 octane