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General Category >> Rubber Side Down! >> "pop" goes the S40
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Message started by 4carbcorvair on 06/24/08 at 10:49:28

Title: "pop" goes the S40
Post by 4carbcorvair on 06/24/08 at 10:49:28

A couple times after I turned off my new 07 s40 yesterday, I got a backfire out the muffler. Anything to worry about? Only has 94 miles on it total.

Title: Re: "pop" goes the S40
Post by SimonTuffGuy on 06/24/08 at 10:50:51

It's normal... Most people suggest getting the jetset from Lancer (on the boards here) to tune the carb a bit.

Title: Re: "pop" goes the S40
Post by Rustbucket on 06/24/08 at 11:06:28

I think every stock 650 does that, including mine. Your's probably backfires when you downshift too, Just like mine... Get used to it, Plus that little pop or poof when you turn it off sounds kinda cool.. :)

Title: Re: "pop" goes the S40
Post by verslagen1 on 06/24/08 at 11:17:02

backfire on shutdown is pretty common on a stock bike.
Usually can be reduced to a poof with an adjustment of the idle mixture screw. This little bugger comes plugged from the factory to prevent adjustment by the unskilled owner. In order to pass your 1st skill test, you must remove this plug w/o damaging the screw head underneath. 2nd skill test, find lancers instructions on how to adjust it. ;D

Title: Re: "pop" goes the S40
Post by mornhm on 06/24/08 at 11:17:37

It can be adjusted to a minimum or eliminated with stock components. The danger in not "fixing" it is that it will shake something loose (exhaust) and then it will get worse. Begin by checking to make sure there are no leaks in the exhaust and then read about adjusting the idle mix. I ran my 2004 with a stock exhaust and only had to adjust the mixture, no new parts needed.

Title: Re: "pop" goes the S40
Post by wrenchbender on 06/24/08 at 11:23:19

If it really bothers you in the interim, I believe if you give the throttle a very slight smigeon of twist on shut down, it will help to eliminate that.

Title: Re: "pop" goes the S40
Post by Paladin. on 06/24/08 at 12:02:29

396E6C7F6F6E627F7B6C647F0D0 wrote:

A couple times after I turned off my new 07 s40 yesterday, I got a backfire out the muffler.....

It is a hallmark of the Savage: http://savage.andruschak.net/gitarzan.html

The rider inspired, when the engine backfired,
Thought if they don't like it that's tuff.
He waved with his hand,
Dropped his kickstand,
And the tailpipe gave off a chuff.

Title: Re: "pop" goes the S40
Post by 4carbcorvair on 06/24/08 at 12:17:17

Doesn't bother me at all. Just wanted to make sure it wasn't out of the norm.

:)

Paladin, nice link. :)

Title: Re: "pop" goes the S40
Post by ALfromN.H. on 06/24/08 at 12:20:49

Mine did that until i put on the sportster pipe on it. Then it made a sound like a shotgun and flames shot out of the pipe about 8-10 inches. Thats when I re-jetted and adjusted the idle mixture screw. It was much better after that.
AL

Title: Re: "pop" goes the S40
Post by PerrydaSavage on 06/24/08 at 13:28:11

I turned up the idle speed thumbscrew a bit on my '03 Savage and this tended to eliminate most of the backfires and shut-down chuff's ... also stopped the Bike from cutting out when rolling off the throttle for a downshift, which it did occassionally ...

Title: Re: "pop" goes the S40
Post by T Mack 1 on 06/24/08 at 13:55:42

My loud pipe (aftermarket SE turn-out) does it almost like a low dog bark, Bullmastiff dog, not a toy poodle ;D

Title: Re: "pop" goes the S40
Post by 4carbcorvair on 06/24/08 at 13:56:48

037A1A36343C66570 wrote:

not a toy poodle ;D

Title: Re: "pop" goes the S40
Post by Robertomoe on 06/24/08 at 20:17:06

I've not cleared it with the more mechanical members here in terms of engine safety, but I pull the choke all the way out of the engine and let it lug a second or two before shutting off. Cuts the backfire, which on my bike sounded much like a cannon

Title: Re: "pop" goes the S40
Post by justin_o_guy2 on 06/24/08 at 21:16:42

Before I bypassed the sidestand safety switch, I used to pull up next to cagers & rev it, drop my left heel on the sidestand Juust a bit, let it up & KER POweee,,,It was handy at stoplights when someone thiought I should enjoy their cRap music, too.

Straight outta the "No WAY that really happened" column. I saw a car with the stereo so loud I could see the deck lid shaking, I got closer & the driver, obviously REAlly enjoying his music, wearing earplugs.. What kinda weirdo DOES that?

Title: Re: "pop" goes the S40
Post by wrenchbender on 06/25/08 at 11:51:30

647B7D7A6760516151697B773C0E0 wrote:

Sidestand safety switch? Was gonna try a wall burn out for a buddy the other week in the garage...when the bike wouldn't crank over while still on the stand. Uh..he had to suggest it was probably the kickstand safety switch. What an embarrasement that was. When did they start putting those on bikes and does it say anything in the manual about them? Not that I've read the manual.... yet.

Anyways...now I'm anxious to try your stoplight trick. Thanks

Title: Re: "pop" goes the S40
Post by Paladin. on 06/25/08 at 12:46:20

667265656C6F61646572000 wrote:

[quote author=647B7D7A6760516151697B773C0E0 link=1214329768/0#13 date=1214367402]....the bike wouldn't crank over while still on the stand....

Means you were also in gear (not neutral.) When I first got my bike I started it up, go to move it and every time I put it in gear it would stall out. Back in the old days I regularly rode off the stand -- hell, that's why they kick backward!