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Author Topic: DR 650 chokes, then backfires  (Read 551 times)

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Offline the ruffian

DR 650 chokes, then backfires
« on: March 13, 2019, 12:14:42 pm »
So, over the last few weeks I have this randomly occurring problem: Iíll be cruising along ( like quarter to a third throttle, on open road) when suddenly , and for no more than a second or two, the bike chokes and dies, and then with a single loud backfire, resumes the cruise.

It seems completely random. On a recent trip , which included the Baviaanskloof, it didnít do it for a coupla hundred Kayís, and then close to home it did it three times in a hundred Kays...?!

Can it be dirt in the carb? If so, why doesnít it affect starting , and the otherwise smooth running that the bike exudes?

Looking forward to your analysis.

With thanks...
 

Offline katana

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Re: DR 650 chokes, then backfires
« Reply #1 on: March 15, 2019, 02:19:33 pm »
Check the spark plug, cap, lead, kill switch, ignition switch, side stand switch.  Unlikely you have a fuel issue as unburnt fuel is filling your exhaust.
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Offline katana

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Re: DR 650 chokes, then backfires
« Reply #2 on: March 15, 2019, 02:29:09 pm »
Maybe CDI or wiring.  Long story short, probably electrical.
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Offline chopperpilot

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Re: DR 650 chokes, then backfires
« Reply #3 on: March 15, 2019, 07:12:21 pm »
DRs are very reliable.

I agree on Katana's analysis, but would first tick the carb off the list, as its relatively easy to remove, strip and clean, although the symtoms might not indicate a fuel problem.
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Offline the ruffian

Re: DR 650 chokes, then backfires
« Reply #4 on: March 16, 2019, 02:01:23 pm »
Good tips, all.

Thank you, K , and Ch.

Iíll let you know what transpires...
 

Offline Colin Kaapschehoop

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Re: DR 650 chokes, then backfires
« Reply #5 on: March 16, 2019, 06:06:09 pm »
Check that you havenít got water in your tank.
 

Offline the ruffian

Re: DR 650 chokes, then backfires
« Reply #6 on: March 18, 2019, 04:26:11 pm »
Whatís the best way to do that ,Colin?
 

Offline katana

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Re: DR 650 chokes, then backfires
« Reply #7 on: March 24, 2019, 09:15:36 pm »
Put a hose on the carb drain and drain the float bowl into a glass.  Any water will float in the bottom - easiest way too check..
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Offline lecap

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Re: DR 650 chokes, then backfires
« Reply #8 on: April 23, 2019, 04:18:24 pm »
My money is on the side stand switch. Check and lubricate the side stand pivot.
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Offline the ruffian

Re: DR 650 chokes, then backfires
« Reply #9 on: April 28, 2019, 04:53:59 pm »
Would you consider de-activating the side stand switch?
 

Offline the ruffian

Re: DR 650 chokes, then backfires
« Reply #10 on: June 12, 2019, 09:15:41 am »
So, hereís the update:

For 2000ks after the original post I did all the wiring and carb checks (thanks for the suggestions, Oakes!), but the problem persisted, very randomly.

Then , timeously (with a big trip coming up), LeCap weighed in with his assertion that it was the side-stand. Thank you, Jurgen! I disassembled the unit (in the up position it was rubbing against the swing arm) bent the shaft accordingly, re-tensioned the springs , lubricated everything , including the switch, and voila! Just did a 3000k trip with no problem. Rode with Ri, who owns several DR650ís, none of which have a side-stand switch - for all the obvious reasons.

Oh, and just for the record, my bike has 25k on the clock, and on this 3000k trip (Northen Cape/Boesmanland...2500ks on dirt), not a drop of oil used, no chain adjustment needed, best consumption 26km/l and average consumption overall 23km/l. Thatís carrying quite a load (self-supported for 10 days with full winter rig and camping gear). Look out for Riís RR soon...
 

Online Ganjora

Re: DR 650 chokes, then backfires
« Reply #11 on: June 12, 2019, 09:23:01 am »
nothing to worry about with a DR until it decides to eat its own gears and destroy its entire engine.
yes,  the ENTIRE engine.
great bikes,  and nothing to complain about,  up to THAT point.
 :eek7:
 

Offline Ri

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Re: DR 650 chokes, then backfires
« Reply #12 on: June 12, 2019, 09:32:38 am »
nothing to worry about with a DR until it decides to eat its own gears and destroy its entire engine.
yes,  the ENTIRE engine.
great bikes,  and nothing to complain about,  up to THAT point.
 :eek7:

And then goes strong for another 10 years after. I think yours is the only DR 650 in RSA this has ever happened to  >:D
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Offline Jacobsroodt

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Re: DR 650 chokes, then backfires
« Reply #13 on: June 12, 2019, 10:00:34 am »
An intermittent starting problem on a CRF230F that I could not trace was eventually identified as a wire running to the start button via the neck that had gone brittle and made occasional contact. I found that out by pressing the start button and then rotating the handlebars until the starter suddenly started turning.  Might be an electrical issue, given the age of the bike?
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Online Ganjora

Re: DR 650 chokes, then backfires
« Reply #14 on: June 12, 2019, 10:05:12 am »
And then goes strong for another 10 years after. I think yours is the only DR 650 in RSA this has ever happened to  >:D

that's why,  once a bike is out of manufacturer's guarantee,  only Runner can touch them.

most likely the only on WD.
i know you love them,  and i know you love our one especially,  but not for me.
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