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post #1 of 9 Old 04-11-2004, 07:17 PM Thread Starter
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Backfire

I have a 2003 V-STROM with about 1600 miles .Sometimes when I down shift it will bacfire .It doesnt do it all the time but it is irritating.Happens mostly from 2nd gear to first.I am not reving the engine too much.This cant be normal on a new bike .
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post #2 of 9 Old 04-11-2004, 08:54 PM
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Re: Backfire

Quote:
Originally Posted by Magblast
I have a 2003 V-STROM with about 1600 miles .Sometimes when I down shift it will bacfire .It doesnt do it all the time but it is irritating.Happens mostly from 2nd gear to first.I am not reving the engine too much.This cant be normal on a new bike .
Are you using regular unleaded gasoline (87 octane)? The V-Strom does wierd things when you use higher octane gas - it runs best on the 87 octane stuff. Over 5000 miles on my '03 using 87 octane and it has never backfired, but I ran one tank of higher octane when I first got it and it "fart stalled" a couple of times. Maybe that is the backfire you are referring to. If so, it has been reported by other riders when using higher octane gasoline.
post #3 of 9 Old 04-12-2004, 04:47 AM Thread Starter
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I was using premium but it stalled out a lot.Switched to 89 now it backfires.I will put some 87 in next time.Thanks for the info.
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post #4 of 9 Old 04-12-2004, 08:04 AM
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Originally Posted by Magblast
I was using premium but it stalled out a lot.Switched to 89 now it backfires.I will put some 87 in next time.Thanks for the info.
I'm pretty sure the high/mid octane gas is the problem. I used to monitor the Yahoo V-Strom forum last year, and this problem was reported several times over there.

Unfortunately, I heard of unknowledgeable dealers recently who have told their customers to run high octane gas. Of course, when someone says that their dealer told them something, it could be that they were dealing with a salesperson who was selling toasters at Sears last week... But there is that old conventional wisdom that high compression engines require high octane gas. Both of my '03 Suzuki's have high compression twins, and they both run great on 87 octane. I think the FI programming might have something to do with that.

Please give us a report back after you've run a couple of tanks of 87 octane to confirm if that was the problem.
post #5 of 9 Old 04-12-2004, 07:22 PM
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My 03 with 11k miles runs crappy on 87 octane
89 works ok cant tell any difference with 93
might be injector problem
I understand some bikes need to be sinked
post #6 of 9 Old 04-12-2004, 07:22 PM
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My 03 with 11k miles runs crappy on 87 octane
89 works ok cant tell any difference with 93
might be injector problem
I understand some bikes need to be sinked
post #7 of 9 Old 04-13-2004, 01:05 AM
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Mine run's way better on 87. It pops back and stalls on 93. :roll: I have syncroed the TB's and still run's better on 89 . Pete
post #8 of 9 Old 04-13-2004, 08:19 AM
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I have an 02 with over 16K. I use 87 octane and it will backfire on low RPM up-shifts! It has been to the dealer twice for this and they say there is nothing wrong with it and cannot duplicate it. It does not happen always, only when running at low rpm for a few minutes.

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post #9 of 9 Old 06-04-2004, 08:24 PM
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backfire

I run 89 in mine. When I ran the first couple of tanks I ran 87 like the manual says and had no problem. When I filled up with 89 I noticed the idle sped up about 100 rpm. With 11.3 compression I just don't feel comfortable with the 87.

I pretty sure the motor has a knock sensor and that's how they get away with the low octane. When the motor starts to detonate the computer backs off the timing to make it stop. Most cars are like this.

I had a GT mustang and the manual said it could run on 87 octane but I read a dyno test where they used 87, 89, then 91 octane gas for different runs to see the difference and the mustang made the most power on 89.
I believe the mustang was 10.8 compression.

That's why I run 89 in my Strom. I want to get the most power out of the stock timing map without the computer backing off because of the knock sensor.

When my idle sped up a little using the 89 I assumed that I was matching more closely what the engine needed. I am betting that the V Strom makes the most power on 89 and that 89 is easier on the engine. Of course I can't prove any of this but from my experience with older cars that didn't have the computerized timing I know you can't run that kind of compression on low octane gas without pinging and detonation.

I'm guessing that a stall out on deacceleration is probably more caused by the idle speed being too low. Too much octane and your just running a slight amount of unburned gas out the exhaust not to mention not getting the maximum efficiency out of your motor.
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