Crackling/popping noise from exhaust while downshifting? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 08-05-2008, 11:54 AM Thread Starter
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Question Crackling/popping noise from exhaust while downshifting?

Oh yeah, I'm just full of questions these days... Sorry, I'm getting to know my used VN750 that came without a manual (though I've found a replacement on eBay) and I've only had it one week!

While riding in to work today (gosh I love saying that), I noticed that more than once, I heard a sort of crackling or popping sound from the exhaust while downshifting. By then the bike was definitely warm. Should I be checking something on my carbs? Maybe they need cleaning, or re-jetting?
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post #2 of 16 (permalink) Old 08-05-2008, 12:19 PM
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If it's just doing it a little bit, it's part of the emission system Kawasaki put on these bikes. If you look in the verses for marbling, you'll get a more in depth explanation.

Also, check the exhaust flange nuts, as I've seen others on here, as well of mine have fallen off. But if that happened, you should notice the louder exhaust noise too.
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post #3 of 16 (permalink) Old 08-05-2008, 05:40 PM
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Mine does the same thing. I've experimented with minimizing the throttle backoff when downshifting. Seems to produce some results.

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post #4 of 16 (permalink) Old 08-05-2008, 06:00 PM
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Just wait until you hear the Howitzer like backfire when you decelerate too fast.

2001 VN750
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Avon Venom X 110/90 Front
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post #5 of 16 (permalink) Old 08-05-2008, 06:59 PM
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Mine does it also, but more so when riding Interstate speeds and exiting onto the off ramp. She really gets to popping then. Not sure why, but I just assume it is from running the higher RPM for the extended periods. Thankfully, I rarely ride the Interstate; unfortunately, every once in a while, I have to.

Jeff

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post #6 of 16 (permalink) Old 08-06-2008, 11:02 AM
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Quote:
Originally Posted by lancer19 View Post
Just wait until you hear the Howitzer like backfire when you decelerate too fast.
hehe, yeah.. I still haven't gotten used to it, it startles the hell out of me..
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post #7 of 16 (permalink) Old 08-06-2008, 11:35 AM Thread Starter
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Quote:
Originally Posted by lancer19 View Post
Just wait until you hear the Howitzer like backfire when you decelerate too fast.
Yeah... I think that's really what I'm talking about, now that you mention it. It's not downshifting per se that's making the noise, it's decelerating.

What do you mean by "too fast"? I'm not yanking/stomping on the brakes, just rolling off the throttle and braking normally. Like going from cruising at 40 MPH to having to slow down to 20 MPH for some traffic congestion as three lanes become two due to a double parked truck.
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post #8 of 16 (permalink) Old 08-06-2008, 12:05 PM
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this is a normal sound for the VN750...and I like it...wish the decell popping was louder
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post #9 of 16 (permalink) Old 08-06-2008, 01:59 PM
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when i lay off the throttle i get 1 pop from the left then 1 from the right every time like music to my ears

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post #10 of 16 (permalink) Old 08-06-2008, 02:12 PM
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Quote:
Originally Posted by robardin View Post
Yeah... I think that's really what I'm talking about, now that you mention it. It's not downshifting per se that's making the noise, it's decelerating.

What do you mean by "too fast"? I'm not yanking/stomping on the brakes, just rolling off the throttle and braking normally. Like going from cruising at 40 MPH to having to slow down to 20 MPH for some traffic congestion as three lanes become two due to a double parked truck.
I should have said rolling off the throttle. I got use to it and actually kind of like it. It's great when it happens under and overpass.

2001 VN750
Vista Cruise Control
V-Force shield
Kawasaki Saddlebag supports
Fixed trunk hinge
TOC MCCT
Clear Alternatives LED tail light
Knifemaker style floorboards
Knifemaker style dash
Avon Venom X 110/90 Front
Avon Venom X 170/80 Rear
Big Crank AGM battery
25,100 miles as of 04/20/2010
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