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rusted baffles what effect on engine

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Guest

Guest
I was looking at my pipes on my 79GS850 and found the inside baffles are all rusted. What effect on the performance/engine is this going to have?
 
If large enough it will run lean. These bikes are lean from the factory and that's why they are so sensitive to airbox and exhaust leaks.
 
chef1366 said:
If large enough it will run lean. These bikes are lean from the factory and that's why they are so sensitive to airbox and exhaust leaks.
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Yay Bill! Way to jump in there and answer the mans question with ah thor e ty! good job.
 
As far as I can see and feel there is nothing left of the baffles at all. The chromes still pretty good so I'm reluctant to by a new set.
 
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If there are exhaust leaks to the outside air (the exhaust is freer flowing than it should be) or if the baffles are largely missing, then yes, it will ruin lean and you will need to compensate with jetting. The really maddening part is that this will likely have a different effect on each side, so, um, good luck with that. Perhaps you'll want to find a way to hollow the pipes out evenly.

However, I've also seen bikes where internal corrosion caused the exhausts to clog and thus run rich. This also prevents the bike from making much power.
 
where to buy new OEM exhaust

where to buy new OEM exhaust

That would explain problems I've been chasing. #3 & #4 are rich and no matter what I do I can't seem to right it. Any one have any good suggestions where to buy OEM exhausts? I will want to stick with the original 2 into 1 pipes. Does anyone have an opinion on the Dennis Kirk pipes? (price sure looks right) Everywhere else I look the fiches show the pipes are no longer available. And thanks for the laugh Chef, the year of messing with jets is exactly what I would like to avoid...but the fire breathin' pipes sound cool!
 
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Great link, but I'm still dealing with stock exhaust so I have no access to the baffles (what's left of them). This tip is for aftermarket pipes that allow you to remove the baffles and pack them. Thanks anyways.
 
azr said:
That would explain problems I've been chasing. #3 & #4 are rich and no matter what I do I can't seem to right it. Any one have any good suggestions where to buy OEM exhausts? I will want to stick with the original 2 into 1 pipes. Does anyone have an opinion on the Dennis Kirk pipes? (price sure looks right) Everywhere else I look the fiches show the pipes are no longer available. And thanks for the laugh Chef, the year of messing with jets is exactly what I would like to avoid...but the fire breathin' pipes sound cool!
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Uhmmm You can shop ebay. But for OEM good luck. ALTHOUGH.. YOU CAN buy just the mufflers for those pipes, cut the old off, weld the new on. But an entire exhaust is not happening. BTW, the mufflers for that bike are the same as for ALL of the 850s, so while your year may list as unavailable, try a different year.
 
just do what us custom builders do........get a couple of mufflers that match off of ANY other bike, weld them on, and jet accordingly. Go for looks.....go for sound......go for price!:D
 
I actually sought out a pair of rusted out pipes so I could change my mufflers, it worked out pretty well all in all. someone had already cut the megaphones off at the ends, so I didn't feel bad ruining anything.

there are basically two pipes in there, the outer chromed muffler, and the inner one into the baffles. I cut the outer one a couple inches shy of the weld, then cut the inner one a bit longer, then the outer lengthwise to allow compression over the new mufflers.

bad2wa4.jpg


I can't remember now if I left these washers in for restriction or just changed the jetting up, but this was my first shot at not having to rejet.

badbm1.jpg


I found some harley turnouts which fit over the inner pipe and inside the outer ones, then used clamps to hold them a bit better.

cutmj4.jpg


this is what my mufflers themselves looked like on the inside.

thebaddn0.jpg
 
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I started with the turnouts, but they were pretty much straight pipes. I later found some stock harley ones in a recycle bin and used those instead. good sound, slightly louder than stock but in a good way. I found with either set I actually had a little better power, but I can't remember if I messed with jetting at all or not... quite possible I went up one size actually.

thegooodsmt2.jpg



with the second pair I decided to use aluminum duct tape to seal the joint as well as the clamp (which really didn't seal anything) helps to reduce the exhaust smell on my leg, and the steam puffs in the middle ;)

I used a few different pieces of strap and even a piece of ski pole as a spacer to keep the stock Suzi mounts and still use Harley hangers existing on the pipes. three years or so and still haven't fallen off! (knock on wood)
 
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