SuzukiSavage.com - Backfire when key is turned off

Welcome, Guest. Please Login or Register :: View Members

SuzukiSavage.com › General Category › Rubber Side Down! › Backfire when key is turned off

(Moderators: verslagen1, Dave, Serowbot)

‹ Previous topic | Next topic ›

Pages: 1

Backfire when key is turned off (Read 103 times)

rayce YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 10	Backfire when key is turned off 08/18/15 at 20:13:04 My S40 has a really loud backfire when i turn the key off. That is the only time it does it. i replaced the petcock with a raptor one. that is the only mod on the bike.
Back to top	IP Logged

Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: Backfire when key is turned off Reply #1 - 08/18/15 at 20:17:02 Sounds normal. What year? Stock jets in the carb? You can tune out most of the backfires but not all of them. Learn to like it.
Back to top	There's no problem that a full tank of gas and a sunny day can't fix! 2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor IP Logged

old_rider

Serious Thumper

Offline

Backyard Bill
Productions

Posts: 3147
flordia panhandle
Gender: male

Re: Backfire when key is turned off
Reply #2 - 08/18/15 at 20:21:23

Some folks pull the choke and shut it down (I have never done that), some just pull up in first gear, clutch in, and put down the kickstand (it will kill it when in gear most times without a bang), then turn everything off.
I turn off the gas..... let it idle for about 30 seconds or so, then shut off the key...8 times out of 10 it won't pop loud.... just go "poof"....
But I've done the spacer mod and adjusted my fuel/air needle....

We are here to laugh at the odds and live our lives so well that Death will tremble to take us.

IP Logged

Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: Backfire when key is turned off Reply #3 - 08/18/15 at 20:43:06 You can also hold the brake and let the clutch out slowly to slow the engine to the point of dying. It will just shut off with no bang.
Back to top	There's no problem that a full tank of gas and a sunny day can't fix! 2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor IP Logged

chasethorn YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 39 Colorado Springs Gender:	Re: Backfire when key is turned off Reply #4 - 08/19/15 at 19:53:43 Mine does this all the time. Wont back fire while riding but right when I kill the bike after riding for a little while it will back fire. just like a fast "ssss thunk" sound
Back to top	IP Logged

1st2know

Senior Member

Offline

Currently between
Savages

Posts: 295
Seattle, WA
Gender: male

Re: Backfire when key is turned off
Reply #5 - 08/19/15 at 22:31:32

rayce wrote on 08/18/15 at 20:13:04:

i replaced the petcock with a raptor one. that is the only mod on the bike.

Check to make sure the vacuum port on the right side of the carb is properly plugged.

When I did the raptor conversion, the cap I put on it fit tight, but would still leak. I put some RTV sealant around the nipple, put the cap back on, let it cure overnight and my (((loud))) backfiring went away. It still went 'poof' on shutdown, but not a bang.

Kaw VN1700, V-Strom 650, Coal powered Chevy Spark.

IP Logged

Super Thumper

Senior Member

Offline

2001 LS650 With 97mm
Big Bore Kit, Stage
III Cam.

Posts: 469
Windsor, Vermont
Gender: male

Re: Backfire when key is turned off
Reply #6 - 08/21/15 at 07:07:46

Two things cause a bike to backfire or "Pop" when rolling off the throttle or on shut down. One is the carb is jetted too lean as with our stock Savage carb. The other is a straight pipe or straight through muffler with NO internal baffle......they ALL backfire when you roll off the throttle unless you jet them very rich which isnt good for performance or economy. Some mufflers with an internal baffle have a smaller hole straight through the baffle....these will still "pop" and backfire on deceleration or shut down but not as bad as an open pipe.

Kudos to Dave for posting the S&S You Tube video.....it tells you all you need to know about jetting carbs and open mufflers/pipes.

Just in case you missed it - here it is again...............

https://www.youtube.com/watch?v=KjKUKhHQLHg

Live To Ride...Ride To Live

IP Logged

Pages: 1

‹ Previous topic | Next topic ›

« Home