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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Gasket beween muffler and engine? /cgi-bin/YaBB.pl?num=1192129294 Message started by islandwahine on 10/11/07 at 12:01:34 |
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Title: Gasket beween muffler and engine? Post by islandwahine on 10/11/07 at 12:01:34 I'm trying to find a different reason for the backfiring. Theoretically what will happen if the gasket between the muffler and the engine is damaged? I noticed that there are 2 different bolts on the muffler clamp, and it also looks like it is has not been mounted all that straight. The top part of the clamp looks closer to the engine then the bottom. |
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Title: Re: Gasket beween muffler and engine? Post by Max_Morley on 10/11/07 at 12:22:27 Any air leak will make the exhaust backfire, especially on deceleration. I've tightened the two at the head and exhaust header 4 or 5 times since I put the new exhaust on mine a couple weeks ago. Easy does it on those as they thread into the aluminum head. The seal at the exhaust pipe to muffler would do the same thing, you would barely hear the leak at idle or runnning, but on deceleration it allows oxygen filled air to come in and makes the backfire. Max |
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Title: Re: Gasket beween muffler and engine? Post by islandwahine on 10/11/07 at 12:32:46 Thanks Max!! |
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Title: Re: Gasket beween muffler and engine? Post by Savage_Rob on 10/11/07 at 12:49:26 Yeah! What he said! Seriously, I tuned and retuned my carb and got really frustrated until I replaced the cylinder head/header gasket I'd originally thought was fine and reused. |
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Title: Re: Gasket beween muffler and engine? Post by islandwahine on 10/11/07 at 14:00:47 Is it possible to make one's own gasket? I still have a whole bunch of the red heat resistant silicone stuff. If I trace the shape on paper, put a piece of waxpaper over that, and squirt the silicone into the exact shape and let it dry, will it work as a gasket? |
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Title: Re: Gasket beween muffler and engine? Post by Reelthing on 10/11/07 at 14:34:42 should work well for about 4.3 minutes |
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Title: Re: Gasket beween muffler and engine? Post by SteveRocket on 10/11/07 at 16:14:37 Remember that part of the engine is so hot that most things will melt or catch fire very quickly. A metal gasket should be used there and they are only about 4 Dollars. Not worth the effort to try and save money there although I think I read here somewhere that someone used parts of an ally can and some muffler paste when he could not stop it leaking I hope that helps a little Steve |
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Title: Re: Gasket beween muffler and engine? Post by islandwahine on 10/11/07 at 17:56:34 Actually I wasn't trying to save money on the gasket, but on the shipping. I couldn't get the part here, and most online places charge a fortune for shipping to Hawaii. I'll check bikebandit, there minimum shipping is only 6 bucks. |
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Title: Re: Gasket beween muffler and engine? Post by Max_Morley on 10/11/07 at 18:49:28 My $02 worth. Consider ordering a couple so you have an extra when you need to take the exhaust off to do the cam chain. I don't think you need a spare one between the muffler exhaust ppipe as it can be removed as an assembly rather than splitting it into 2 pieces. Also the o-rings for the oil filter cover and the one inside to seal the filter to the crankcase. They are nice to have around, then you have them when you need to change the oil unscheduled. I usually get 5 or 6 at a time and then write myself a note to reorder when I get down to 2 left. Might look at the price of oil filters from your source and toss in a years supply of those. Now the freight on the gaskets doesn't look so bad. Max |
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Title: Re: Gasket beween muffler and engine? Post by SteveRocket on 10/11/07 at 18:54:35 islandwahine wrote:
I thought that might be the case but I just wondered if you knew how inexpensive they were. No offence meant Steve |
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Title: Re: Gasket beween muffler and engine? Post by Jack_650 on 10/11/07 at 22:52:22 I've been wondering on the exhaust gasket thing myself. Wondering that is about if an auto exhaust-to-header "O" ring gasket would work in there? The correct size of course. Or maybe one of those metal compression type gaskets? Inquiring minds want to know. Jack |
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Title: Re: Gasket beween muffler and engine? Post by Savage_Greg on 10/12/07 at 07:49:42 islandwahine wrote:
BUT is the top closer than the bottom? Was it backfiring before you took it all apart? My exhaust gasket is the original and 7 years old. I've had my pipe on and off at least a dozen times and even ported the exhaust without having any leaks. Whatever you do, don't tighten or adjust the bolts with the engine hot, and use some antisieze on them if you remove them. |
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Title: Re: Gasket beween muffler and engine? Post by SteveRocket on 10/12/07 at 09:34:25 Something that I have been wondering is, Is there a better Stud/Bolt to hold the header. Mine comes loose weekly with the stock studs. Every post I have seen says No Loctite, use anti sieze, so that what I have done. I am thinking of ordering new oem studs but if there is a better alternative I will get them. Also just for info they have been correctly torqued amd I have tried with spring washers and without. Suggestions from our learned brethern?. That includes our lady riders too. Steve |
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Title: Re: Gasket beween muffler and engine? Post by demin on 10/12/07 at 15:40:20 If they keep coming loose,maybe drill the studs for cotter pins or drill nuts safetywire them. |
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Title: Re: Gasket beween muffler and engine? Post by thumperclone on 10/12/07 at 15:53:44 demin wrote:
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Title: Re: Gasket beween muffler and engine? Post by SteveRocket on 10/12/07 at 16:27:20 hard to tell really as when I tighten them I can't see what is turning They are acorn nuts If I remove completey I believe the stud come out . I like the ideas if drilling and wiring them . Steve |
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Title: Re: Gasket beween muffler and engine? Post by bill67 on 10/12/07 at 16:44:43 If the stud is coming out I dont think wiring is going to help |
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Title: Re: Gasket beween muffler and engine? Post by islandwahine on 10/12/07 at 22:19:57 Savage_Greg wrote:
My muffler has been backfiring since I purchased it. This hasn't changed even with the spacer mod and bigger pilot and jet. It still backfires when I shut the engine down. That's why I started thinking it might be the muffler. Also I looked underneath where the muffler and the pipe meet. It is extremely rusty there, so chances are that I might have some rust holes there. It's too hard to tell. Got to think of a way to see if the are any holes. Wonder if putting a solution of dish soap all over the pipe will reveal anything. |
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Title: Re: Gasket beween muffler and engine? Post by Savage_Greg on 10/13/07 at 05:10:05 SteveRocket wrote:
These are not going to stay really tight. They are holding a compression gasket and each time you tighten them the gasket gets compressed more. The only objective is to keep it from leaking. That is why some bikes use springs to hold them on. Only use anti-seize on the "nut/stud/bolt". Go ahead and remove one of them, if it is loose, just to see. Won't hurt a thing. I believe that you will find that they are bolts with chrome acorn heads. BTW - the answer to "what kind" of fasteners they are is just a couple topics away... http://w3.bikepics.com/pics/2007/10/06/bikepics-1047744-full.jpg |
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Title: Re: Gasket beween muffler and engine? Post by Savage_Greg on 10/13/07 at 05:20:35 islandwahine wrote:
You're gonna have a little rust under there unless you are really thorough in your cleaning and waxing. It's one of those "out of sight, out of mind" things that usually get overlooked. Check it with the bike running. See if you feel any leaking. Do you have any soot on the engine in that area? Don't let those large round holes in the muffler heat shield fool you either, but you could have a loose clamp. |
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Title: Re: Gasket beween muffler and engine? Post by Savage_Rob on 10/13/07 at 10:07:14 O course , it is Hawaii. I've seen quite a few roadside sacrifices to the rust god there and very little ferrous metal escapes his notice. |
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Title: Re: Gasket beween muffler and engine? Post by Savage_Greg on 10/13/07 at 10:14:47 Savage_Rob wrote:
Aloha, O god o' rust... I forgot about the climate...maybe volcanic ash is the problem :P |
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Title: Re: Gasket beween muffler and engine? Post by islandwahine on 10/13/07 at 10:35:20 Savage_Greg wrote:
How does one "feel" any leaking? The muffler gets pretty hot you know. :P Quote:
I have lots of soot where the muffler and the pipe meet. Underneath in the "hidden from view" place. And I still have that tiny oil drip coming from that upside down bolt underneath where the pipe meets the engine. |
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Title: Re: Gasket beween muffler and engine? Post by Savage_Greg on 10/13/07 at 12:34:49 islandwahine wrote:
That's funny too...I said, "see if you feel..." Anyway...just put your hand down there when it is still cool and blip the throttle a few times to FEEL a leak. Don't touch it anymore, after it gets hot. All I can say :P It is possible your muffler gasket is damaged if you have soot. If you question either gasket, they are cheap. Change 'em, torque 'em and forget 'em. I hate to say it, but you are gonna have that drip from that upside down nut until you replace the head gasket. Seems like they all do it. Look at all the topics about it. Even one topic about a broken stud which probably happened cause the nut was torqued too much along the way while trying to stop the leak. After I get some time on my new head gasket, I'll know if I had any success in fixing the leak this time. |
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Title: Re: Gasket beween muffler and engine? Post by islandwahine on 10/13/07 at 21:08:46 Thanks Greg! I rode her to town today and back and she ran great!! At one point I happened to look at the speedo and I was going 60! Oops! Speed limit is 50. So now she really goes faster easier, feels great! STill a big bang at the end. I'll go "feel" the leak tomorrow. |
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Title: Re: Gasket beween muffler and engine? Post by Savage_Greg on 10/13/07 at 22:50:31 islandwahine wrote:
Well, just think of the Big Bang as the beginning of something good :P |
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Title: Re: Gasket beween muffler and engine? Post by toddlamp8 on 10/14/07 at 01:11:18 Where are you guys ordering the header/engine gasket for $4? |
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Title: Re: Gasket beween muffler and engine? Post by Max_Morley on 10/14/07 at 21:29:35 I just got 3 from my local dealer for $12.75. The retaining clamp was lots more, mine was warped from being tightened with the RAASK pipe on. I was afraid it would break so I ordered a spare in case it did, -the riding days are getting numbered and I would hate to miss one waiting a week for that part- so far it has straightened nicely and seems to stay tight now, was needing to be re-tightened every couple days as it went back to flat. I could tell when it was allowing air in because of the decel backfire, specially when first starting from cold. Max |
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Title: Re: Gasket beween muffler and engine? Post by Savage_Greg on 10/15/07 at 08:00:21 toddlamp8 wrote:
If you like online ordering, Ron Ayers and Bike Bandit sell the OEM gaskets. |
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Title: Re: Gasket beween muffler and engine? Post by Savage_Rob on 10/15/07 at 10:01:32 Savage_Greg wrote:
Also CrotchRocket.com, who seems to have the best price a lot of the time. Also be aware that BikeBandit.com offers a small discount to AMA members so, if you're a member, take that into account when comparing prices. When it comes to OEM stuff I still find myself usually ordering from CrotchRocket.com or RonAyers.com. |
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Title: Re: Gasket beween muffler and engine? Post by Digger on 07/05/08 at 21:23:34 1A2F383A026B686D5D0 wrote:
It was a while ago, but I managed to stop that leak without removing the head. I'm pretty sure all I did was remove the nut, apply some Permatex Ultra Copper (http://www.permatex.com/products/Automotive/automotive_gasketing/gasket_makers/auto_Permatex_Ultra_Copper_Maximum_Temperature_RTV_Silicone_Gasket_Maker.htm) to the threads of the stud and to the surface the base of the nut contacts, and reinstall the nut using the proper torque. Mine's now been dry for thousands of miles (KOW). |
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Title: Re: Gasket beween muffler and engine? Post by Gort on 07/06/08 at 11:58:06 7369767B747E6D7B7273747F1A0 wrote:
Peramatex's best silicone sealer only withstands 600 degrees continuous duty heat exposure. They do sell 2 products for 2000 degree exhaust work: http://www.caswellplating.com/permatex/permrepairprods.html |
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