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Old 01-31-2016, 07:42 PM   #1
xsv
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1999 SV650 Problem

Rode back home from RR today, bike loss power at 7-8k RPMS and RPMs dropped to zero with throttle still engaged for 1-2 seconds then the bike back fired and regained power. This happened over ten times on the ride back. Any ideas what the problem could be? I did notice the bike backfiring in the mornings when I had it on choke and bursts of flames shot out the exhaust. No problems on the ride this morning though, only on the way back. I refilled at the same gas station before heading home. Front spark is about 2 weeks old, and the other spark is less than a year old. I ride daily to work. I've read around and some people said it could be the fuel pump, and others say maybe a bad gasket.
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Old 01-31-2016, 07:45 PM   #2
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I think there's a thread here on a Gen 1 SV650 with similar symptoms. I'll try to dig it up when I can, but it should pop up in a search.
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Old 01-31-2016, 07:46 PM   #3
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99 SV is carb'd so I its not the fuel pump because u dont have one. When was the last time u checked fuel filter or cleaned the carb? Has it been sitting a while? Sounds like a carb issue.....I suck at carbs but it sounds like the float needle is getting stuck and maybe clogged with dirt or needs replacement.
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Old 01-31-2016, 08:04 PM   #4
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Quote:
Originally Posted by BYRDMAN View Post
99 SV is carb'd so I its not the fuel pump because u dont have one. When was the last time u checked fuel filter or cleaned the carb? Has it been sitting a while? Sounds like a carb issue.....I suck at carbs but it sounds like the float needle is getting stuck and maybe clogged with dirt or needs replacement.
haven't checked the fuel filter or cleaned the carbs since I bought it about 1 year ago with 46k miles on it. and i ride the bike daily to work.

Last edited by xsv; 01-31-2016 at 08:08 PM.
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Old 01-31-2016, 08:16 PM   #5
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Side stand switch could be malfunctioning
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Old 01-31-2016, 08:28 PM   #6
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Side stand switch could be malfunctioning
wouldn't the bike completely shut off if this were the case? when it loses power, the motor is still running
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Old 01-31-2016, 08:34 PM   #7
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Could be a # of things.....take it up to Motorcycles Unlimited and have it fixed right the first time around....
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Old 01-31-2016, 08:38 PM   #8
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Sounds to me like a fuel issue.
I'd say drain the float bowls and try not to spill the gas or try to catch it. At least get it in a clean paper towel.
If there's in it or in the bottom of the bowls you may need to clean the carbs. In any case a new in line fuel filter is cheap insurance.
There is also a filter on your petcock(s) inside the tank. That can get plugged up as well. Might even need to clean out the tank if its bad.
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Old 01-31-2016, 08:39 PM   #9
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Could be a # of things.....take it up to Motorcycles Unlimited and have it fixed right the first time around....
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Old 01-31-2016, 09:32 PM   #10
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Check your battery cables
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Old 01-31-2016, 11:26 PM   #11
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+1 on the battery cables. Check all your grounds as well
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Old 02-01-2016, 01:49 AM   #12
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Check the intake manifolds.
I've seen SV's cough and partially pop a carb out of the manifold.
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Old 02-01-2016, 08:03 AM   #13
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Quote:
Originally Posted by Patrick View Post
Check the intake manifolds.
I've seen SV's cough and partially pop a carb out of the manifold.
that JUST happened to me yesterday.....
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Old 02-01-2016, 08:30 AM   #14
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2 other things to check:
The coil mounted to the l/h side of the frame becomes unplugged.
The retainer for the jet needle in the slide pops off and allows the needle to bounce up and down.
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Old 02-01-2016, 10:13 AM   #15
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Due to the backfire, would the timing chain or valves need adjusting? Over 46k miles...
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Old 02-02-2016, 02:48 PM   #16
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Your "on-off" switch may be malfunctioning - or wires leading to it.....
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Old 02-03-2016, 10:45 AM   #17
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if your exhaust is blowing flames that may represent a rich condition in the exhaust system.

Also, when it backfires then dies, this could be a clogged exhaust...just thinking outloud...because i know when cat converters malfunction on cars it creates a clogged condition where the engine dies or wont run over a certain speed.

not exactly the apples to apples but you can get the idea in extreme instances of exhaust clogging how this would manifest itself.
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Old 02-05-2016, 02:25 PM   #18
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hey buddy did you get your sv650 sorted out or are you planning on taking it up to Motorcycles Unlimited to get it looked at?

also you might try visiting www.svrider.com
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Old 02-06-2016, 07:34 PM   #19
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Thanks for all the input everyone. As of right now, I am planning on dropping off the bike at Motorcycles Unlimited. I'm sure there are multiple factors in this and I just don't have the time to work on the bike.
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