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Author Topic: DR650 making strange noise  (Read 946 times)

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Offline Acajou

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DR650 making strange noise
« on: December 30, 2015, 10:38:24 pm »
Hi guys. I think my bike has bad gas, and is making strange and inappropriate noises from it's exhaust pipe  ;D

But seriously, I have noticed the past two times I have gone for a short ride that when I come back and park the bike, it makes a strange backfiring sound after I turn the engine off. It's not the usual sharp "gunshot" backfire, more of a "mattress falling off the roof" sound, a "WHOMP" if you will. My bike does not generally backfire at all, except for some pops and crackles when shifting down aggressively.

The bike is jetted for JHB altitude and I am at about 800m at the moment. Could it be running lean, and more importantly, should I be worried?
2010 Suzuki DR650
2009 Yamaha WR450F
2000 Suzuki GN250
 

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Re: DR650 making strange noise
« Reply #1 on: December 31, 2015, 05:53:13 am »
Maybe re igniting when you switch it off? Don't ask me why but it makes you skrik the first time! :imaposer:
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Offline 2wdrift

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Re:
« Reply #2 on: December 31, 2015, 03:17:40 pm »
Its from unburnt fuel/air mixture in the exhaust igniting. If I had to guess, your bike is running slightly lean at the lower altitude so the exhaust might run hotter than normal letting it ignite any unburned fuel. I dont know why it would suddenly start doing it though. I had mine on the factory carb settings at sea level and never had anything like that happen.

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Offline Acajou

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Re:
« Reply #3 on: December 31, 2015, 11:15:06 pm »
Its from unburnt fuel/air mixture in the exhaust igniting. If I had to guess, your bike is running slightly lean at the lower altitude so the exhaust might run hotter than normal letting it ignite any unburned fuel. I dont know why it would suddenly start doing it though. I had mine on the factory carb settings at sea level and never had anything like that happen.

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It seems to be intermittent and infrequent. I'm not going to worry about it too much, as it hasn't happened again
2010 Suzuki DR650
2009 Yamaha WR450F
2000 Suzuki GN250
 

Offline chopperpilot

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Re: DR650 making strange noise
« Reply #4 on: January 01, 2016, 12:53:20 am »
Take the carb off, strip and give it a thorough clean. Don't spray carb cleaner on any rubber parts.

The DR (CV) carb is not sensitive to changes in altitude.

There is most probably some dirt in the jets.


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Offline Acajou

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Re: DR650 making strange noise
« Reply #5 on: January 01, 2016, 08:05:01 am »
Take the carb off, strip and give it a thorough clean. Don't spray carb cleaner on any rubber parts.

The DR (CV) carb is not sensitive to changes in altitude.

There is most probably some dirt in the jets.


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Thanks, I will give it a go. Interesting about it not being sensitive to changes in altitude, I did not know that  :thumleft:
2010 Suzuki DR650
2009 Yamaha WR450F
2000 Suzuki GN250
 

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Re: DR650 making strange noise
« Reply #6 on: January 01, 2016, 08:10:15 am »
Kyk sommer of jou carb boot nie lek nie en vas is.
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Offline chopperpilot

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Re: DR650 making strange noise
« Reply #7 on: January 01, 2016, 09:22:22 am »
Kyk sommer of jou carb boot nie lek nie en vas is.
Dis nie 'n Yamaha nie!




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Offline chopperpilot

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Re: DR650 making strange noise
« Reply #8 on: January 01, 2016, 09:23:09 am »
Kon dit nie weerstaan nie! Beste vir 2016!


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Re: DR650 making strange noise
« Reply #9 on: January 01, 2016, 10:03:22 am »
Kon dit nie weerstaan nie! Beste vir 2016!


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Offline chopperpilot

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Re: DR650 making strange noise
« Reply #10 on: January 02, 2016, 04:22:51 pm »
Kon dit nie weerstaan nie! Beste vir 2016!


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Current Bikes : KTM 990 R, KTM 500 XCW

End of an Era : Suzuki DR 650 SE, Husqvarna 610 TE