Melting Backpressure

[Son of a Zuki :-()]

Alright, here's the deal. I followed Diamond Jim's directions to a T for the fibrosleeve, however, not only does it not sound that great, but it seems like there are serious back pressure issues.

I think it may be because the fibrosleeve takes the standard exhaust from a
3" pipe, down to the 2" PVC Pipe.

I went to remove the firbrosleeve, but after my first 50 mile ride, now the f'ing PVC pipe is melted to the exhaust, is anyone else having these problems? Should I have used a high temperature PVC pipe?

[05HDRAM]

Ah, I don't think you were supposed to leave the PVC in the pipe...

[snowman671]

Step 9:

The PVC pipe will not remain in the muffler. It is used only to mold the wire mesh shape and as a tool to help place the fiberglass and mesh in the exhaust.

[Son of a Zuki :-()]

I think I see what you guys are saying and no, the PVC pipe is not in the muffler. It is in the exhaust, but wrapped inside the fiberglass. I guess the fiberglass was not enough to keep it cool. Do you think tinfoil will work? When I use it for potatoes on the grill, I can usually pick them right up without burning my hands. Worth a shot?

[07M50Limited]

Originally Posted by Son of a Zuki :-()

I think I see what you guys are saying and no, the PVC pipe is not in the muffler. It is in the exhaust, but wrapped inside the fiberglass. I guess the fiberglass was not enough to keep it cool. Do you think tinfoil will work? When I use it for potatoes on the grill, I can usually pick them right up without burning my hands. Worth a shot?

No, you dont see, the pvc is removed completly

[Mario]

[05HDRAM]

The PVC is used to put the mesh and packing material into the muffler. One the mesh and packing are in, the PVC is removed.

[07M50Limited]

Let the bike cool off, Im not sure how pvc sticks to metal, after its melts, it might chip off, after it cools, get all of it you can out of there, and start over.

[1badbaker]

ya know...even though diamond jim specifically said that the pvc was only for molding and insertion purposes and that you needed to remove it, I've been waiting for someone to leave it in there

I kinda want to see pics of this.....

[Low Rolla]

I ran into this exact same issue earlier this spring, and found a pretty straightforward fix. Basically, in addition to the standard 2" PVC, I also bought a coupling that necks down to 1 1/2" pipe, and attached approximately 6" of the 1 1/2" PVC to the coupling. Before installation *THIS IS VERY IMPORTANT OR ELSE THIS WILL NOT WORK*, I took the bike out fo a fairly aggressive 40 mile ride doing speeds 55-85mph. From there, park the bike and its time to get to work.

The next step is to keep the engine running while bike is in neutral at approximately 4500rpm- a jury-rigged hose clamp or vise-grip with a rag can hold the throttle for you. From there, using the heat produced through the exhaust itself, jam the 2" to 1 1/2" PVC pipe as far into the exhaust as it will go. The first one I did by hand, and for the second I pushed the bike backwards and jammed the pipe in to the exhaust using the weight of the machine to hold it in.

After both sections of PVC have been in the exhaust for approximately 20 minutes, kill the engine and allow everything to cool for at least an hour. Using a sawzall with multi-purpose blade, saw off PVC pipes even with the exhaust pipes, and you're good to go.

I hope this helps to get you back on the road, 'Zuki....ride safe.

[1badbaker]

seriously now....are people really leaving pvc pipe in their exhaust. I don't want to come off as an a**hole, but that just sounds ridiculous to me.

[rkr0923]

dee dee dee
had to be said

[07M50Limited]

Originally Posted by Low Rolla

I ran into this exact same issue earlier this spring, and found a pretty straightforward fix. Basically, in addition to the standard 2" PVC, I also bought a coupling that necks down to 1 1/2" pipe, and attached approximately 6" of the 1 1/2" PVC to the coupling. Before installation *THIS IS VERY IMPORTANT OR ELSE THIS WILL NOT WORK*, I took the bike out fo a fairly aggressive 40 mile ride doing speeds 55-85mph. From there, park the bike and its time to get to work.

The next step is to keep the engine running while bike is in neutral at approximately 4500rpm- a jury-rigged hose clamp or vise-grip with a rag can hold the throttle for you. From there, using the heat produced through the exhaust itself, jam the 2" to 1 1/2" PVC pipe as far into the exhaust as it will go. The first one I did by hand, and for the second I pushed the bike backwards and jammed the pipe in to the exhaust using the weight of the machine to hold it in.

After both sections of PVC have been in the exhaust for approximately 20 minutes, kill the engine and allow everything to cool for at least an hour. Using a sawzall with multi-purpose blade, saw off PVC pipes even with the exhaust pipes, and you're good to go.

I hope this helps to get you back on the road, 'Zuki....ride safe.

Am I reading this right, you put more pvc in the exhaust????
The melting point of PVC is 176 degrees F

[Son of a Zuki :-()]

Thanks Rolla, but I have a couple of questions. It's pretty tight in there with the 2" PVC pipe already, so I'm not sure I can get a coupling around it. Also, since it has fused to the metal, it's not possible to pull it out to put the coupling on? I could maybe take some of the leftover 2" and use some of the PVC glue to work as a coupling and extend it in the exhaust?

Also, mine is only a 2006, and I just got it. You must have a 2008, because I don't see a tach on mine, thus not sure where 4500 rmp is? Can you recommend an after market exhaust, or send some audio of what your bike sounds like at 4500rpm, and I will try and match the pitch on mine? Finally, being new to riding, I'm not very comfortable riding it aggresively at those speeds. If I just rode if for an hour @ 30 - 45mph, do you think that it would suffice?

[Low Rolla]

Originally Posted by 07M50Limited

Am I reading this right, you put more pvc in the exhaust????

Yes- the key is integrating the two different sizes of PVC- the 2" gives a deeper sound while taking out the metallic straight pipe ping, and the 1 1/2" is more pliant and better conforms to the shape of the pipes. Again, the key to making this work here is the high heat of the exhaust- do NOT use a torch to heat the outside of the pipes!

[Son of a Zuki :-()]

Sorry, I meant to say "aftermarket Tachometer" above.

[Easy Rider]

Originally Posted by 07M50Limited

Am I reading this right, you put more pvc in the exhaust????
The melting point of PVC is 176 degrees F

I think (hope) he forgot to put a few smilies in there along the way.....

AND 2 posts later......I think somebody is just screwing with us.
I think he should stick his d*** in the exhaust pipe while the engine is running.

[CentIllRider]

Originally Posted by Low Rolla

I ran into this exact same issue earlier this spring, and found a pretty straightforward fix. Basically, in addition to the standard 2" PVC, I also bought a coupling that necks down to 1 1/2" pipe, and attached approximately 6" of the 1 1/2" PVC to the coupling. Before installation *THIS IS VERY IMPORTANT OR ELSE THIS WILL NOT WORK*, I took the bike out fo a fairly aggressive 40 mile ride doing speeds 55-85mph. From there, park the bike and its time to get to work.

The next step is to keep the engine running while bike is in neutral at approximately 4500rpm- a jury-rigged hose clamp or vise-grip with a rag can hold the throttle for you. From there, using the heat produced through the exhaust itself, jam the 2" to 1 1/2" PVC pipe as far into the exhaust as it will go. The first one I did by hand, and for the second I pushed the bike backwards and jammed the pipe in to the exhaust using the weight of the machine to hold it in.

After both sections of PVC have been in the exhaust for approximately 20 minutes, kill the engine and allow everything to cool for at least an hour. Using a sawzall with multi-purpose blade, saw off PVC pipes even with the exhaust pipes, and you're good to go.

I hope this helps to get you back on the road, 'Zuki....ride safe.

roflmao because surely you cannot be serious..... or can you?

[07M50Limited]

Originally Posted by Easy Rider

I think (hope) he forgot to put a few smilies in there along the way.....

AND 2 posts later......I think somebody is just screwing with us.
I think he should stick his d*** in the exhaust pipe while the engine is running.

I would have to agree, I have no more comments.

[07M50Limited]

I take that back, this could be a great mod for lost back pressure, that glob of plastic, in there would have to do something

Just did a quick Google search, and its proven this will work, in all bikes but NOT on a Suzuki M50