Author Topic: rear exhaust is leaking, what is the best way to fix?  (Read 139 times)

coinsrus

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rear exhaust is leaking, what is the best way to fix?
« on: June 11, 2018, 01:32:53 AM »
Been a while since I have been here.  Bike is running good, starts easy, Got rid of the gel cell bat and put in a featherweight lithium battery.  Now it starts easy and no problems with power.  Still haven't put the fairing on yet. I've got this problem with the rear exhaust it won't stop leaking.  Could use some help.  Thanks

Walt_M.

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Re: rear exhaust is leaking, what is the best way to fix?
« Reply #1 on: June 12, 2018, 04:03:41 AM »
Good that you have the battery under control. Some people worry about the lithium batteries but I have one in my RZ, no problem for over 4 years. As for your exhaust leak, it could be a couple of things. If it's leaking at the exhaust port, you can get new crush gaskets. Yamaha may still stock them but one of the forum members, Blake, got a hundred of them and will let you have them for shipping. If the leak is at the junction, which is more likely, you will have to find serviceable replacement washers. They get flame cut very quickly if they come loose and will never stop leaking. They are NLA new and you will have to source used ones that are not flame cut. Happy hunting. 
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cvincer

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Re: rear exhaust is leaking, what is the best way to fix?
« Reply #2 on: June 13, 2018, 08:30:48 AM »

You don't say where the leak is, but I presume at the  'Y'  fitting for the rear cylinder.

I cured my problems at this joint by using  High Temp (red) silicon sealer.

Rikugun

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Re: rear exhaust is leaking, what is the best way to fix?
« Reply #3 on: June 13, 2018, 02:19:26 PM »
For reference, this is what the parts in question look like. The part that Walt referenced as being no longer available is marked "A". If the joint has been loose and leaking, the chrome rings marked "D" may also be damaged.

Part "E" fits into the head and there is a crush washer ahead of it which is not pictured. That crush gasket may still be available new but not the other.
« Last Edit: June 13, 2018, 02:24:17 PM by Rikugun »
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fret not

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Re: rear exhaust is leaking, what is the best way to fix?
« Reply #4 on: June 13, 2018, 02:40:10 PM »
I recall John Clemens explaining his method of eliminating leaks.  He said to leave things a bit loose but all parts in place, block the muffler up against the bottom of the under side of the bike and THEN tighten all the joints and connections.  This is good advice for most things that have various connections and joints.
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QBS

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Re: rear exhaust is leaking, what is the best way to fix?
« Reply #5 on: June 13, 2018, 08:01:17 PM »
After Johns' advice is followed, run the bike to fully hot and let cool.  Then retighten the long clamping allen head screws until they make a single snapping sound.  Then stop attempting to turn them.  Ride the bike as normal and repeat this procedure until the screws refuse to snap.  This will ensure that the clamping assembly is fully tightened.  My thinking in doing this is that I think that when the clamping system is really tight, the vibration and hot cold cycling can't cause the assemblys parts to rub against each other and allow the copper rings to loose their seal, which then leads to fatal sliver disc flame cutting.

coinsrus

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Re: rear exhaust is leaking, what is the best way to fix?
« Reply #6 on: June 13, 2018, 09:34:46 PM »
Thanks for your help guys! Its leaking where the ring marked A is.  I have tried to find those and no good so far.  Maybe  I will have to  try cvincer's  High Temp (red) silicon sealer.  Also loosen the exhaust system as fret not says, then retighten (as qbs suggested) it up and hope for the best keep my eye out for those donut gaskets.

coinsrus

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Re: rear exhaust is leaking, what is the best way to fix?
« Reply #7 on: June 21, 2018, 10:34:41 PM »
Does anyone have the dimensions of the copper rings?  The nla marked "A".