SV Talk, Tuning & Tweaking Discussion and chat on all topics and technical stuff related to the SV650 and SV1000 Need Help: Try Searching before posting |
|
Thread Tools |
20-05-17, 11:42 AM | #31 |
Member
Mega Poster
Join Date: Feb 2017
Location: JAMOADR(1999 Curvy) 36,000 miles
Posts: 1,431
|
Re: Popping and banging on the over run.
As Blapper says air-leaks around carb joints can cause over-run popping but also on CV carbs perforated or worn Air-cut-off valves are a common cause.
The ACVs are part of the CV carb system.They enrich the fuel when the throttle is closed on deceleration.Without them the fuel to air mixture is too lean and popping can result. In this respect they are the same as the CV carbs in my Honda CX500s which I've done a lot of work on over the years. HTH
__________________
"Stultus est sicut stultus facit" Last edited by R1ffR4ff; 20-05-17 at 01:12 PM. |
22-05-17, 08:36 AM | #32 |
Guest
Posts: n/a
|
Re: Popping and banging on the over run.
Cool thanks for the info, I'll have a look.
|
22-05-17, 09:14 AM | #33 |
Member
Mega Poster
Join Date: Feb 2017
Location: JAMOADR(1999 Curvy) 36,000 miles
Posts: 1,431
|
Re: Popping and banging on the over run.
I use Parts-fiche for my model/s as an additional reference to my manuals when looking for how things are put together, https://www.cmsnl.com/suzuki-sv650-1...6.html#results You can see the ACVs on the diagram.Always worth bookmarking the Parts-fiche for your model. Also if the bike is getting on in years it's worth taking the tank off and checking to see if there are any water droplets in it(Good clean out). Condensation over the years can well down at the bottom and gasoline itself has a moisture content.If any of this gets sucked into the carbs it can settle at the bottom of a float bowl and then gets flicked up into the fuel-to-air mixture causing all sorts of misfiring problems
__________________
"Stultus est sicut stultus facit" Last edited by R1ffR4ff; 22-05-17 at 09:18 AM. |
24-05-17, 08:40 AM | #34 |
Member
Mega Poster
Join Date: Jul 2003
Location: Doncaster, oop norf
Posts: 2,122
|
Re: Popping and banging on the over run.
The leaks Blapper meant are at the exhaust, so drawing in air and burning unburnt fuel in the exhaust. With a closed throttle the vacuum in the carb venturi is high so it is often a bit rich on overrun so can pop a bit, not loud backfiring though, that would be more like air leaks.
If you have no info on what's been done to the bike then a dyno run for around £25 will tell you power output and about the fuelling. A new zorst means the carbs need fiddling with to compensate (by some unknown amount, depends on the set-up) but some of this may already have been done. |
24-05-17, 03:20 PM | #35 |
Member
Join Date: Jun 2016
Location: Rochester,Kent.
Posts: 824
|
Re: Popping and banging on the over run.
I did.
|
24-05-17, 03:57 PM | #36 |
Member
Join Date: Oct 2010
Location: Yellow Belly County
Posts: 564
|
Re: Popping and banging on the over run.
What's wrong with a bit of popping and banging on over run anyway?
My ol' D9 does it and I love it Last edited by Teejayexc; 24-05-17 at 07:07 PM. Reason: Crap spelling |
24-05-17, 06:50 PM | #37 |
Member
Mega Poster
Join Date: Jul 2003
Location: Doncaster, oop norf
Posts: 2,122
|
Re: Popping and banging on the over run.
Mine pops and burbles too, I've got a full Akro system, K&N and dyno set-up. Actual backfiring isn't so good, but it's pretty easy to tell the difference. If it were then that would mean an exhaust leak which would also mean lean running on that cylinder, and most likely unbalanced carbs.
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
lozzo banging on! | davepreston | Idle Banter | 10 | 01-12-11 06:34 AM |
Popping and banging? | Owenski | SV Talk, Tuning & Tweaking | 6 | 28-09-09 01:30 PM |
Help Banging Noises! | Ginger 1 | Bikes - Talk & Issues | 6 | 01-02-09 09:26 PM |
Exhaust Popping And Banging | Stewbie | SV Talk, Tuning & Tweaking | 10 | 01-02-09 02:31 PM |
Loud banging (misfire) | hallasv | SV Talk, Tuning & Tweaking | 9 | 20-10-08 10:03 AM |