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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> My Savage Backfires like crazy! /cgi-bin/YaBB.pl?num=1176568372 Message started by Meye on 04/14/07 at 09:32:52 |
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Title: My Savage Backfires like crazy! Post by Meye on 04/14/07 at 09:32:52 Hello everyone, I was searching the web trying to find answers to my backfiring concerns when I stumbled on this forum. Nice to see something like this exists, hopefully I'm not just asking a question that's been discussed many times over but here it is. I just recently bought an '02 Savage from a dealer (first bike, first time riding) and my knowledge about what's normal and what isn't is pretty slim to none. The first week I had it, the backfiring would only happen when I shut it off, but now it backfires when I acel, decel, shift, coast, shut off... I called and asked a few places/people and as suggested I've replaced the air cleaner, spark plug, changed the oil/filter, ran out the old gas and fueled with higher octane (91)...immediately after doing that the backfiring went away for about two days, and now it's back as bad as ever....cept now I can visibly see black smoke from the exhaust pipe, very little but it's there. I'm almost ready to give in and pay the dealership insane amounts of money to look at it, but was hoping anyone would have some feedback as to the actual cause...or if it even is a problem at all? Any and all input would be much appreciated. |
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Title: Re: My Savage Backfires like crazy! Post by Greg_650 on 04/14/07 at 10:11:54 Welcome. There are numerous topics already in progress or completed on this very subject. The subject is like Ground Hog Day...it repeats and repeats....or maybe it's like the Energizer Bunny and keeps going and going...oh well, you get the idea :P Just plan to stay awhile, and read through any topics that you see about jetting, noises, or mufflers. Go back a couple pages. Check out the Technical section, but trust me, there ain't nothing unique about your bike, equipment or situation. It's all been done. It's all right here for the Whole World Wide Web to see, but whatever you do...stay away from the dealership. He's the one that sells backfires ;D |
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Title: Re: My Savage Backfires like crazy! Post by serowbot on 04/14/07 at 10:51:05 Some backfire, pops and blats are kinda' normal in a big single but, the black smoke may indicate a problem since it's a new symptom. I would check the vacuum line to the petcock for a gas leak first, then if that's not leaking check for a sticky float in the carb. You can search this site for details on how-to. Petc0ck, pethingy.... spellings are altered on this site for the word because a filter takes the c* word as vulgar. BTW.. You really don't need premium gas in this bike. |
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Title: Re: My Savage Backfires like crazy! Post by Reelthing on 04/14/07 at 11:46:31 serowbot wrote:
oooo... teatering on a fuel thread..... ::) |
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Title: Re: My Savage Backfires like crazy! Post by skatnbnc on 04/14/07 at 11:57:47 Yes Suzi backfires, which as my sister points out, "It is announcing you have ARRIVED!" The smoke sounds off to me too. Take the pipe off and have a look - mine had some crud up under the aftermarket bracing that smoked and smelled nasty when I first bought the bike. Looked like the installer (read first owner) added the pipe without removing all the packing material, or left a tie wrap against the hot pipe - who knows. Cleaned that out, and all was well. |
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Title: Re: My Savage Backfires like crazy! Post by Greg_650 on 04/14/07 at 12:01:16 Reelthing wrote:
Are you trying to instigate a thread cleaning? Shhhh. Be vewy vewy qwiet! |
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Title: Re: My Savage Backfires like crazy! Post by Savage_Rob on 04/14/07 at 13:33:55 Welcome to the site. Backfiring? Wow, I've never heard of an LS650 doing that. ;) |
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Title: Re: My Savage Backfires like crazy! Post by Greg_650 on 04/14/07 at 16:29:38 Savage_Rob wrote:
I heard somewhere that if you drill out your venturi and make more gas flow inside that the backfires will stop. Shhh, don't tell anyone about my signature line :P |
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Title: Re: My Savage Backfires like crazy! Post by verslagen1 on 04/14/07 at 18:06:22 Loose nuts (like these guys) sometime causes the backfires. Check the header pipe clamp nuts and the muffler clamp. But I really think its your oil... (highjack, highjack) Welcome to the group ;D |
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Title: Re: My Savage Backfires like crazy! Post by Greg_650 on 04/14/07 at 22:31:40 verslagen1 wrote:
I've had backfires all day. I might be running lean or my muffler is loose. BTW - how do you pronounce Meye? Is it "M-eye" or "Me Ya"? Anyway, welcome to Suzuki Savage Country. |
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Title: Re: My Savage Backfires like crazy! Post by Meye on 04/14/07 at 22:48:33 :) Thanks for the warm welcome and advice. I had forgot to mention that while learning to ride I did set it down a few times (luckily my body took most of the damage - both the bike and myself walked away with minor scratches) but it turns out after reading about exhaust leaks, that it was the problem....must have jogged it loose when it tipped over, tightened it up best I could.... weather didn't allow for more than a few minutes of riding, but the backfire was reduced to a slight crackling. It seems though that the backfiring is appealing to some riders, if I had ignored it and continued to ride with the backfiring, can any damage to the bike happen? Oh, and it's pronounced M-Eye (My) ;) |
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Title: Re: My Savage Backfires like crazy! Post by Greg_650 on 04/14/07 at 23:19:36 Meye wrote:
Welcome back My Eye ;D The Svage backfires naturally. As long as it is stock and healthy, that's what Suzuki (with help from the EPA and maybe even Al Gore) meant for it to do. Not to worry. Your baby is good to go. Sorry and Congrats on the spills. It's a learning curve. Gotta get it dirty so you can clean it up again. |
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Title: Re: My Savage Backfires like crazy! Post by Rockin_John on 04/15/07 at 00:39:06 Greg_650 wrote:
And if you've ever had your venturi drilled out, you know what a painful experience that can be! ;) |
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Title: Re: My Savage Backfires like crazy! Post by LANCER on 04/15/07 at 06:28:14 Reprint from the "Mother Ship ... Mikuni" website. 4: Backfires in Exhaust Note: It is normal for many high performance exhaust systems to moderately backfire or pop when the throttle is closed from mid-to-high rpm. In fact, one should expect a well-tuned high performance engine to "pop" and "crackle" when the throttle is closed at high rpm. The popping is a result of the air/fuel mixture becoming very lean when the throttle is closed and the engine is rotating well above idle speed. It is also necessary that the exhaust system have rather open mufflers. Why This (normally) Happens: 1) When the throttle valve is in the idle position, fuel does not flow out of the main system (needle, needle jet, main jet). Fuel is only delivered to the engine by the pilot (idle) system. 2) The combined effect of the closed throttle and elevated engine rpm is to create a fairly strong vacuum in the intake manifold. This vacuum, in turn, causes a high air flow rate through the small gap formed by the throttle valve and carburetor throat. 3) Under these conditions the pilot (idle) system cannot deliver enough fuel to create a normal, combustible air/fuel ratio. The mixture becomes too lean to burn reliably in the combustion chamber. It gets sent into the exhaust system unburned and collects there. 4) When the odd firing of the lean mixture does occur, it is sent, still burning, into the exhaust system where it sometimes ignites the raw mixture that has collected ---- the exhaust then pops or backfires. 5) Completely stock Harleys do not do this until open-end mufflers, such as the popular Screamin' Eagle slip-ons, are installed. The exhaust must be both free-flowing and have an open exit for the popping to occur. Other possible causes: Air Leaks: Any source of fresh air into the exhaust system can create or worsen the conditions that bring about exhaust backfiring. The most common entry point is the junction of the header pipes and mufflers. Even a small air leak can dramatically increase the intensity or likelihood of exhaust system backfiring. A high temperature silicone sealant, as can be found in many auto parts stores, may be used to seal the pipe/muffler junction. Lean Carburetion: While exhaust system popping may be considered normal, it is certainly made worse by an overly lean idle circuit. Be sure that your carburetor's pilot jet is the correct size and that the idle air mixture screw is correctly adjusted before looking for other causes of popping. The procedure for adjusting the pilot circuit is covered in the Tuning Manual. Ignition: If exhaust system popping is very loud, irregular and accompanied by loss of power, then you should suspect that the ignition system is not performing as it should. If, for some reason, the ignition sometimes fires at the wrong time, then exhaust popping can become very energetic (loud). Look for failing high tension leads (plug wires), failing ignition coil(s) and especially switches or connectors as possible |
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Title: Re: My Savage Backfires like crazy! Post by Greg_650 on 04/15/07 at 06:36:35 Rockin_John wrote:
Yep. You'll suck a dent in your tank. ;D |
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Title: Re: My Savage Backfires like crazy! Post by Rockin_John on 04/15/07 at 08:34:04 Greg_650 wrote:
Gonna have to nickname you "old faithful" ;D |
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Title: Re: My Savage Backfires like crazy! Post by klx650sm2002 on 04/16/07 at 01:28:52 KLX "pops and Crackles" at high revs on a closed throttle, sounds sweet. Clive W :D |
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Title: Re: My Savage Backfires like crazy! Post by LANCER on 04/16/07 at 02:09:14 klx650sm2002 wrote:
Ahhhh, the sound of a properly jetted & tuned carburetor ... you're whispering sweet nothings in my ear again. ;D |
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Title: Re: My Savage Backfires like crazy! Post by Rockin_John on 04/16/07 at 08:47:12 klx650sm2002 wrote:
LANCER wrote:
And to think, there are people who actually pull the clutch in and coast to a stop, and don't downshift through all the gears, just so they don't have to listen to that "noise!" ::) As long as there aren't any damaging shotgun blasts, it is the second best sound a thumper can make. |
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