Miss firing on downshift - SV650.org

13-07-13, 06:17 PM

Hello,

Lately my bike has been miss firing on the downshift. Not all the time but its not rare.

My bike is a '00 650s, no modifications mechanically (at least to my knowledge).

It may just be because I am not concentrating or something but I hear a sort of pop and a sudden loss of throttle but it's only for about half a second.

Any ideas?

Or is it me

maviczap · 13-07-13, 07:27 PM

Are you sure it's not just the engine popping on the overun?

There's no load on the engine so any unburnt fuel will cause this popping until you open the throttle again

If it was mis firing it would be mis firing on open throttle too.

andrewsmith · 13-07-13, 07:33 PM

is it as you release the clutch?
Sounds like overun, as mine sounds like a miss fire between 1st and 2nd if it catches the neutral slightly.

13-07-13, 07:58 PM

Ahhh that could be it!

Thanks

I haven't really heard of overrun that much, it does go away if I open the throttle again it's never done it up the upshift or whilst the gears are engaged.

PyroUK · 13-07-13, 08:50 PM

Ahhhh the v twin over run

awesome with an aftermarket can and better with the db killer removed

13-07-13, 09:55 PM

Quote:

Originally Posted by PyroUK

Ahhhh the v twin over run

awesome with an aftermarket can and better with the db killer removed

My blue Evo twin port without the baffles... Pops like a beauty when you shut the throttle, especially in 3rd

13-07-13, 06:17 PM	#1
MrKarl Guest Posts: n/a	Miss firing on downshift Hello, Lately my bike has been miss firing on the downshift. Not all the time but its not rare. My bike is a '00 650s, no modifications mechanically (at least to my knowledge). It may just be because I am not concentrating or something but I hear a sort of pop and a sudden loss of throttle but it's only for about half a second. Any ideas? Or is it me

13-07-13, 07:27 PM	#2
maviczap Member Mega Poster Join Date: Mar 2007 Posts: 9,097	Re: Miss firing on downshift Are you sure it's not just the engine popping on the overun? There's no load on the engine so any unburnt fuel will cause this popping until you open the throttle again If it was mis firing it would be mis firing on open throttle too. __________________ We're riding out tonight to case the promised land Make everyday count RIP Reeder - Jolly Green Giant and comedy genius

13-07-13, 07:33 PM	#3
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Miss firing on downshift is it as you release the clutch? Sounds like overun, as mine sounds like a miss fire between 1st and 2nd if it catches the neutral slightly. __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

13-07-13, 07:58 PM	#4
MrKarl Guest Posts: n/a	Re: Miss firing on downshift Ahhh that could be it! Thanks I haven't really heard of overrun that much, it does go away if I open the throttle again it's never done it up the upshift or whilst the gears are engaged.

13-07-13, 08:50 PM	#5
PyroUK Member Mega Poster Join Date: Feb 2011 Location: Poole Posts: 1,083	Miss firing on downshift Ahhhh the v twin over run awesome with an aftermarket can and better with the db killer removed __________________ 2011 Triumph Daytona 675, Arrow exhaust and QS!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
I miss my SV and I miss Biking and I miss London! :(	musne	Bikes - Talk & Issues	22	24-12-12 02:32 PM
Not firing up	phatwheels	Bikes - Talk & Issues	9	26-10-12 02:13 PM
Front cylinder miss-firing in very wet weather	Springbokki	SV Talk, Tuning & Tweaking	10	30-07-09 10:25 AM
Firing order	scorpion	SV Talk, Tuning & Tweaking	27	24-08-07 12:41 PM
My first post - miss firing	booner	SV Talk, Tuning & Tweaking	8	16-08-06 09:57 AM