Beowulf Exhaust backfires, bad for my bike? - SV650.org

11-04-12, 08:54 PM

I have fitted a Beowulf slip-on.

Now that it's bedded in, it sounds really lovely, especially with the db killer removed!

In particular, it can produce some pretty impressive backfires - complete with flames.

BUT - is that damaging my engine in any way? The sound and the backfires and gurgling is very nice, but I don't want to damage the engine.

11-04-12, 09:05 PM

If it's anything like my Delkevic stubby, it pops and bangs like a goodun on the over run. I believe it's quite normal. I'm pretty sure somebody more knowledgeable will be along shortly to give a better explanation. It does sound pretty epic though doesn't it.

Bibio · 11-04-12, 09:11 PM

i have a k7 twin spark with a warrior fitted and i don't get backfiring, flames or popping.

NTECUK · 11-04-12, 09:11 PM

You should fit a PC as its not so good having unburned fuel washing the bore of oil,Lean Mixtures often backfire
You Tried a Performance filter as they sometimes counter act each other ?

rictus01 · 11-04-12, 09:13 PM

if a can was the only change you made and was fitted correctly, then you shouldn't have excessive back firing or flames, I suspect you haven't sealed it very well

However, it's unlikely (but no promises) to damage the engine, but if your can is a race one and has packing in it, this will be stripped out far quicker, leaving the skin (especially if it's carbon) susceptible to heat damage or distortion.

Cheers Mark.

11-04-12, 09:28 PM

So, mine being a curvy could be running a little on the lean side. It generally pops and bangs when rolling off after quick burst of acceleration? If I'm being a bit more conservative with the throttle it doesn't do it anywhere near as much.

NTECUK · 11-04-12, 09:30 PM

Richen the idle up a touch.Mind you the carb,s ant easy to get too

12-04-12, 12:45 AM

Its fine for the engine . I rev alot and hit kill switch on and off very fast and it sounds like a bomb exploded . I did this 100 times on my birthday . And a few other times and nothing has happened lol . Give it ago . U wont stop doing it .its funny watching people jump lol

12-04-12, 07:50 AM

Quote:

Originally Posted by Joe Marcon

I did this 100 times on my birthday .

Were you 100 years old?

12-04-12, 08:11 AM

i think the only way it could damage is if it backfired back through the cabrs/airbox. its unlikely but im sure some people on here have had it happen, but no mention of damage.

flames look cool dont they

11-04-12, 08:54 PM	#1
XmisterIS Guest Posts: n/a	Beowulf Exhaust backfires, bad for my bike? I have fitted a Beowulf slip-on. Now that it's bedded in, it sounds really lovely, especially with the db killer removed! In particular, it can produce some pretty impressive backfires - complete with flames. BUT - is that damaging my engine in any way? The sound and the backfires and gurgling is very nice, but I don't want to damage the engine.

11-04-12, 09:05 PM	#2
Noddy Guest Posts: n/a	Re: Beowulf Exhaust backfires If it's anything like my Delkevic stubby, it pops and bangs like a goodun on the over run. I believe it's quite normal. I'm pretty sure somebody more knowledgeable will be along shortly to give a better explanation. It does sound pretty epic though doesn't it.

11-04-12, 09:11 PM	#3
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: Beowulf Exhaust backfires i have a k7 twin spark with a warrior fitted and i don't get backfiring, flames or popping.

11-04-12, 09:11 PM	#4
NTECUK Member Mega Poster Join Date: Apr 2011 Location: essex Posts: 5,314	Re: Beowulf Exhaust backfires You should fit a PC as its not so good having unburned fuel washing the bore of oil,Lean Mixtures often backfire You Tried a Performance filter as they sometimes counter act each other ? __________________ Raisin cookies that look like chocolate chip cookies are the reason I have trust issues. Last edited by NTECUK; 11-04-12 at 09:15 PM.

11-04-12, 09:13 PM	#5
rictus01 Member Mega Poster Join Date: Jul 2003 Location: South London Posts: 9,799	Re: Beowulf Exhaust backfires if a can was the only change you made and was fitted correctly, then you shouldn't have excessive back firing or flames, I suspect you haven't sealed it very well However, it's unlikely (but no promises) to damage the engine, but if your can is a race one and has packing in it, this will be stripped out far quicker, leaving the skin (especially if it's carbon) susceptible to heat damage or distortion. Cheers Mark. __________________ Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming, 'Wow! What a Ride!

11-04-12, 09:28 PM	#6
Noddy Guest Posts: n/a	Re: Beowulf Exhaust backfires So, mine being a curvy could be running a little on the lean side. It generally pops and bangs when rolling off after quick burst of acceleration? If I'm being a bit more conservative with the throttle it doesn't do it anywhere near as much. Last edited by Noddy; 11-04-12 at 09:29 PM.

11-04-12, 09:30 PM	#7
NTECUK Member Mega Poster Join Date: Apr 2011 Location: essex Posts: 5,314	Re: Beowulf Exhaust backfires Richen the idle up a touch.Mind you the carb,s ant easy to get too __________________ Raisin cookies that look like chocolate chip cookies are the reason I have trust issues.

12-04-12, 12:45 AM	#8
Joe Marcon Guest Posts: n/a	Re: Beowulf Exhaust backfires, bad for my bike? Its fine for the engine . I rev alot and hit kill switch on and off very fast and it sounds like a bomb exploded . I did this 100 times on my birthday . And a few other times and nothing has happened lol . Give it ago . U wont stop doing it .its funny watching people jump lol

12-04-12, 08:11 AM	#10
tom-k6 Guest Posts: n/a	Re: Beowulf Exhaust backfires, bad for my bike? i think the only way it could damage is if it backfired back through the cabrs/airbox. its unlikely but im sure some people on here have had it happen, but no mention of damage. flames look cool dont they

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