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Exaust note / backfire change (Read 4 times)

Richard Amirault

Guest

Exaust note / backfire change
07/06/05 at 07:22:21

My bike has about 2600 miles on it.

After a weekend camping trip (where I ran the bike at 60 to 65 mph for a hours at a time) I noticed that the exaust note was different than before.

Now it's "sharper" than before .. more of a popping sound than a throaty sound .. AND .. the bike is now much more prone to backfire when I let off the throttle .. and those backfires are "sharper" and louder than before.

What happened?

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gandalph40

Ex Member

Re: Exaust note / backfire change
Reply #1 - 07/06/05 at 07:27:56

Check all the connections in the exhaust system, starting with the 2 bolts that connect the header to the cylinder head. It sounds to me like you've got one or more loose connections. If they're loose, tighten them CAREFULLY...I don't have the torque specs, but you don't want to break one of those boys off.

You don't say if you have a factory or aftermarket muffler. If you have an aftermarket muffler, I would look closely at the connection between the muffler and the header pipe also.

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SavageDude Serious Thumper Alliance Member Offline Posts: 561 OC_California Gender:	Re: Exaust note / backfire change Reply #2 - 07/06/05 at 10:35:52 And look closely at the flange that attaches the header to the engine exhaust manifold. If is turning blue around that area, you have either loose bolts or leaking gasket. I would try to retorqued them and see if it helps. If not you know what to do next (a long-drawn process just to get to the darn gasket)
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Susan Serious Thumper 2004 No Login Offline Been AWOL but I'm back... Posts: 682 Eastern PA Gender:	Re: Exaust note / backfire change Reply #3 - 07/06/05 at 11:32:36 gandalph40 wrote on 12/31/69 at 16:00:07: ...I don't have the torque specs, but you don't want to break one of those boys off... See Torque Specs List in the technical corner.
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WD Serious Thumper 2005 No Login Offline Professional "scooter trash". Posts: 5207 Rosemark TN Gender:	Re: Exaust note / backfire change Reply #4 - 07/06/05 at 19:34:28 Your head pipe donut gasket has likely done like mine and vaporized. When I find the size/part number, I'll put it in the technical section. -WD
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Savage_Rob Serious Thumper Alliance Member Offline Mechanically Inclined Amateur Posts: 6972 Texas (Dallas area) Gender:	Re: Exaust note / backfire change Reply #5 - 07/07/05 at 08:06:15 It's also easy to get the header just slightly off-kilter and have a slight leak. Bikebandit and RonAyers both have the gaskets. RonAyers has typically had slightly better prices, in my experience. However, Bikebandit now has a small discount for AMA members, so check it out.
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Richard Amirault

Guest

Re: Exaust note / backfire change)
Reply #6 - 07/31/05 at 14:47:25

UPDATE:

After finally getting over to the dealer and trying to order the exahust port gasket (after all, everything else I've bought for the bike they had to order) I was surprised to see that THEY HAD THEM IN STOCK ... so I got two of 'em.

Then I got my Clymer manual and a nice day (don't have a garage to work in ) and started to loosen up the exaust to get to the gasket.

Long story short .... didn't have to use the new gasket .. one of the bolts was LOOSE holding the clamp over the pipe end onto to the cylinder!! (I mean it was just about finger tight .. surprised it hadn't fallen out all the way)

I did remove both bolts and slid back the clamp but decided not to go any further and re-assembled everything ... bike sounds like it used to now. The loose bolt must have caused the exaust to leak past the gasket at anything over idle .. that was the "sharp" exaust note I was hearing.

Proud of myself for finding and fixing the problem, but also somewhat foolish for not checking that first Wink

Richard in Boston, MA, USA

PS still have to deal with the handlebar 'problem'

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