sv 650 backfire

[BigGeeking]

hi all

I have a SV650 2000.

I have been running it for about 2 months and she has been sweet as a nut but tonight on the way home i was cruising at 40mph in 6th and i had a backfire this was like a shotgun going off.

Everything is standard it idles good and pulls smooth starts good half choke for 1 min in the morning.

The only thing i have done is put 33bhp restrictors in the carbs.

is it the cold because i have read a lot of SVs back fire

Thanks,

John
____________________
Bendy "Flip front. I can filter down the M4 while shoving a Twix in my face."
honda CG 125 2001 SOLD-- current Bandit 400--SOLD. current SV650s 2000
MOD 1 ON 20/7/2011**passed** MOD 2 ON 17/10/2011***passed***,,

[Vincent]

When was the last time the plugs were changed?

40MPH in 6th doesn't sound too good.
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Space Is Deep

[doggone]

V twins and singles do backfire more easily than fours.
Has it only done it once?

[BigGeeking]

[Vincent]

If it's not doing it regularly, I wouldn't worry too much. And if it's only when decelerating, I wouldn't worry at all. My bike farts and pops like no-ones business.
If you're trying to accelerate, to overtake for eg, when you're doing 40 in 6th, you're going to need more throttle which means more fuel and some could get to the exhaust without being burnt off and ignite causing the backfire. Most bikes are happier at higher revs and you're not labouring the engine as much. They'll also respond quicker if you need to get out of harms way.

If you're bike's had a larger sprocket stuck on the rear, it might explain the "40 in 6th" but that sounds like a low speed in a high gear to me.
____________________
Space Is Deep

[BigGeeking]

Thanks Vincent

It’s just me being a cheep arse putting it in higher gears.

On the way in to work this morning and all was good no back fire i think it was like you said "need more throttle which means more fuel and some could get to the exhaust without being burnt off and ignite causing the backfire."

but I was having some fun this morning so there was plenty of high revs.

ps I hate 33bhp restrictors just as it gets going proper it shit outs.

thanks

John
____________________
Bendy "Flip front. I can filter down the M4 while shoving a Twix in my face."
honda CG 125 2001 SOLD-- current Bandit 400--SOLD. current SV650s 2000
MOD 1 ON 20/7/2011**passed** MOD 2 ON 17/10/2011***passed***,,

[Vincent]

[BigGeeking]

Yeah it dose make sense what you are saying and I have debated about the restrictors falling out but it is just my look to have a crash and they check it or I get pulled by a jobs worth.

It’s just not worth my license and it makes my job just bearable because I get to use my bike twice a day to get there and home.

Thanks for all the replies

Thanks
John
____________________
Bendy "Flip front. I can filter down the M4 while shoving a Twix in my face."
honda CG 125 2001 SOLD-- current Bandit 400--SOLD. current SV650s 2000
MOD 1 ON 20/7/2011**passed** MOD 2 ON 17/10/2011***passed***,,