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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Backfiring /cgi-bin/YaBB.pl?num=1210558773 Message started by Texasphotographer on 05/11/08 at 19:19:33 |
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Title: Backfiring Post by Texasphotographer on 05/11/08 at 19:19:33 I actually did a search for this before posting, but did not understand any of the answers regarding backfiring. My 2005 does this often. What causes it and what can I do to stop it? |
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Title: Re: Backfiring Post by verslagen1 on 05/11/08 at 19:33:33 There are several reasons for backfiring (techically it's an afterfire) 2 most prevalent are lean carb adjustment, and exhaust leaks. If it backfires on shutdown or idling, and I mean kaboom not just a puff. then most likely it's the pilot adjustment. Look on the right side of the bike, right side of the carb, there should be a brass plug if you have an unadulterated bike, otherwise if the plug has been removed, you'll see a screw. See lancers straight and simple tuning guide for how to adjust. If it does a puff at shut down the adjustment is either a shade rich or just right. If it backfires on shift, every shift, check for exhaust leaks first. Then you can try increasing your jets or the white spacer mod. |
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Title: Re: Backfiring Post by Texasphotographer on 05/12/08 at 16:41:12 Thank you for taking your time to respond. The backfiring I am experiencing is when down-shifting. Due for servicing soon. Will have that fixed at the same time. |
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Title: Re: Backfiring Post by rpgpgmr on 05/13/08 at 06:49:30 I have finally tuned out the backfire on shutdown and have achieved a smooth idle. However, I still experience puffs/backfires (not too bad, but enough that I want to fix it) during shifting. I've done the white spacer mod (it's about 1/4 of what it was) and have changed my main jet to a 150. I think our puffs/backfires during shifting may be due to the pilot jet? I'm gonna do some more tuning with the idle mixture screw, but I may wind up having to go up to the 55 pilot jet. Are you going to have a dealership do this work for you? If so, they may not re-jet your carb and/or adjust the idle mixture. The reason our carb (I have an '05 too) is so lean is because that's the way the EPA demands it. It may be against the law to mess with the jets/idle mixture. Not sure.... |
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Title: Re: Backfiring Post by Texasphotographer on 05/17/08 at 11:09:52 I spoke to the service manager at the dealership. He said some backfiring is normal with the S40 when downshifting. I have not heard it spit when I shut it off. |
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Title: Re: Backfiring Post by verslagen1 on 05/17/08 at 11:17:51 does he mean a poof kind of backfire or a KERPOW kind? poof I'd accept, KERPOW I would not. In my experience (however limited) backfire on shifting was caused by exhaust leak. And it did Kerpow on shutdown. Tightening the header bolts fixed both. |
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Title: Re: Backfiring Post by saratovich on 05/17/08 at 17:03:56 Remember if you tighten the header bolts (on the front of the cylinder head) do it when the engine is COLD!! Otherwise, when the engine cools it contracts and may damage the threads for the header bolts! |
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Title: Re: Backfiring Post by Baldeagle on 05/17/08 at 18:22:02 I also have a 2005. Jerked out the white spacer and replace with a 3/33sec size washer........pulled the plug and adjusted it out 2 full turns. Also found a small leak between the header pipe and muffler. This was well over two years ago and no problems. Header pipe has not turned gold or blue. RIDE SAFE!!!!! |
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Title: Re: Backfiring Post by jomiyo on 05/21/08 at 10:51:05 You haven't done anything about the exhaust leak? do you still have the backfiring problem? |
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Title: Re: Backfiring Post by Baldeagle on 05/21/08 at 13:01:37 Fixed the leak when found............Get a little puff after a long ride at 50+ miles an hour, but expect that.. Loud bangs?......No. I have been thinking about an after market muffler, but I don't want one I would have to tinker with the carb all the time. Seems like some on here differ as to the rejetting. I'm aways open to suggestions. :) |
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Title: Re: Backfiring Post by jomiyo on 05/21/08 at 13:14:17 what did you use to fix the leak, i have heard of many things |
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Title: Re: Backfiring Post by Baldeagle on 05/21/08 at 13:26:13 I put the 'mojo' on the bolt...........If that did not solve the leak I would have ripped it all off and replaced the header and muffler gasket and probably added some gasket sealer from Autozone. |
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Title: Re: Backfiring Post by verslagen1 on 05/21/08 at 14:03:21 7B58555D5C585E555C390 wrote:
Translation: Get a little tube of antiseize, remove the header bolts and paint the business end w/antiseize. Replace bolts and torque to 15 to 20 ft-lbs. If that don't take care of it, replace the gasket and repeat above. |
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Title: Re: Backfiring Post by Max_Morley on 05/21/08 at 14:43:12 If you are going to use a lubricant (ie antisieze) then use the lowest end of the torque specs, other wise you may strip the head threads. Unless noted in the shop manual specs and I've not see it, the specs are for clean dry threads. Max |
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Title: Re: Backfiring Post by Baldeagle on 05/21/08 at 16:16:45 No problem with header bolts.......'Mojo' was to tighten the muffler clamp. |
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Title: Re: Backfiring Post by machz54 on 05/21/08 at 17:14:36 Need to do white washer adjustment on both of mine looks like carb comes of quite easy from side without removing gas tank any tricks to save time would be great..Dave |
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Title: Re: Backfiring Post by Baldeagle on 05/21/08 at 17:42:23 I removed the tank to replace the plug while doing the spacer. Before removing the carb top cover go ahead a get some extra screws because however gentle you try some of these four will strip out on you. I don't remember the size but some of these fine gear heads will know. Good luck and RIDE SAFE! :) |
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Title: Re: Backfiring Post by machz54 on 05/22/08 at 17:29:42 I just finished doing bike #1 everything went good and it seems to have solved the backfiring issue so now that i know I'm no going to mess things up I can now go on to my wifes... Just a small tip for the screws that seem to be giving trouble ,my cordless drill has a clutch on it and I set it on very low and slowly increased the torque setting until the screws came out no fuss no muss,and no stripped heads...Dave |
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Title: Re: Backfiring Post by jomiyo on 05/23/08 at 05:30:14 Dave, were you able to get it out the side with out any problems? how long did it take you, before you were back on and riding? |
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Title: Re: Backfiring Post by machz54 on 05/25/08 at 11:03:01 less than 1 hour that includes time wasted looking for a washer I dropped..it did come out the side but it is a tight fit I found swearing a lot helped..Dave |
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Title: Re: Backfiring Post by jomiyo on 05/27/08 at 05:06:44 I frequent the upper case numbers too... @#$@'# @#$ |
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