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Post by earthman on Dec 22, 2018 21:17:02 GMT 1
www.fowlersparts.co.uk/parts/4041347/rd350lc-4l0-1982-999-b/exhaustGoing by the diagram on that site, a sealing ring (number 11) and a fiber gasket (number 12) are the only items needed for each pipe. I've just removed both pipes on mine and do indeed have those components but I see that the right hand cylinder has another ring/washer still pushed in to it, the left hand cylinder has the groove cut into it but it's empty. Is this another different sealing ring to order/buy??
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Post by mattybeckett on Dec 22, 2018 23:55:51 GMT 1
www.fowlersparts.co.uk/parts/4041347/rd350lc-4l0-1982-999-b/exhaustGoing by the diagram on that site, a sealing ring (number 11) and a fiber gasket (number 12) are the only items needed for each pipe. I've just removed both pipes on mine and do indeed have those components but I see that the right hand cylinder has another ring/washer still pushed in to it, the left hand cylinder has the groove cut into it but it's empty. Is this another different sealing ring to order/buy?? Mine had an extra one in the right hand barrel for some unknown reason, I only fitted one in each barrel when refitting pipes and all was ok 👍
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Post by earthman on Dec 23, 2018 11:34:27 GMT 1
www.fowlersparts.co.uk/parts/4041347/rd350lc-4l0-1982-999-b/exhaustGoing by the diagram on that site, a sealing ring (number 11) and a fiber gasket (number 12) are the only items needed for each pipe. I've just removed both pipes on mine and do indeed have those components but I see that the right hand cylinder has another ring/washer still pushed in to it, the left hand cylinder has the groove cut into it but it's empty. Is this another different sealing ring to order/buy?? Mine had an extra one in the right hand barrel for some unknown reason, I only fitted one in each barrel when refitting pipes and all was ok 👍 Thanks for confirming that your bike were the same, I didn't have any exhaust blowing/leaks with this set up either,.....it just seems odd to me, I wonder if we should or shouldn't have another sealing ring in that left barrel then??
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Post by mattybeckett on Dec 23, 2018 18:30:41 GMT 1
Mine had an extra one in the right hand barrel for some unknown reason, I only fitted one in each barrel when refitting pipes and all was ok 👍 Thanks for confirming that your bike were the same, I didn't have any exhaust blowing/leaks with this set up either,.....it just seems odd to me, I wonder if we should or shouldn't have another sealing ring in that left barrel then?? I would just go for one in each and everything should be fine.. The copper ones are the best, that's just my opinion. 👍
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Post by oldelsieboy on Dec 23, 2018 18:41:16 GMT 1
www.fowlersparts.co.uk/parts/4041347/rd350lc-4l0-1982-999-b/exhaustGoing by the diagram on that site, a sealing ring (number 11) and a fiber gasket (number 12) are the only items needed for each pipe. I've just removed both pipes on mine and do indeed have those components but I see that the right hand cylinder has another ring/washer still pushed in to it, the left hand cylinder has the groove cut into it but it's empty. Is this another different sealing ring to order/buy?? All depends which pipes & barrels you have fitted to what gaskets and/or spacers you need. OEB
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Post by earthman on Dec 23, 2018 19:27:20 GMT 1
www.fowlersparts.co.uk/parts/4041347/rd350lc-4l0-1982-999-b/exhaustGoing by the diagram on that site, a sealing ring (number 11) and a fiber gasket (number 12) are the only items needed for each pipe. I've just removed both pipes on mine and do indeed have those components but I see that the right hand cylinder has another ring/washer still pushed in to it, the left hand cylinder has the groove cut into it but it's empty. Is this another different sealing ring to order/buy?? All depends which pipes & barrels you have fitted to what gaskets and/or spacers you need. OEB Original standard pipes and 350 barrels.
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Post by earthman on Dec 23, 2018 19:33:01 GMT 1
Thanks for confirming that your bike were the same, I didn't have any exhaust blowing/leaks with this set up either,.....it just seems odd to me, I wonder if we should or shouldn't have another sealing ring in that left barrel then?? I would just go for one in each and everything should be fine.. The copper ones are the best, that's just my opinion. 👍 I've just put the bike back together, just as it were, sounds good/no leaks. My gut feeling is that only one washer should be used though, it's certainly fiddly to get a second one to stay lined up with the one that sit's in the barrels groove before bolting the whole thing up.
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Post by oldelsieboy on Dec 23, 2018 20:18:43 GMT 1
All depends which pipes & barrels you have fitted to what gaskets and/or spacers you need. OEB Original standard pipes and 350 barrels. Early or later barrels? OEB
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Post by earthman on Dec 23, 2018 22:04:51 GMT 1
Original standard pipes and 350 barrels. Early or later barrels? OEB I dunno,...how can you tell the difference?
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Post by earthman on Dec 23, 2018 22:51:14 GMT 1
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Post by oldelsieboy on Dec 23, 2018 22:56:05 GMT 1
Do your cylinders have a number 1 cast onto the reed valve inlet as pic? OEB
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Post by earthman on Dec 23, 2018 23:13:35 GMT 1
Thanks OEB, will have a look for number tomorrow.
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Post by earthman on Dec 24, 2018 13:01:50 GMT 1
Both my barrels are indeed stamped with a 1 So what's the difference when it comes to the sealing ring(s) aspect??
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Post by earthman on Dec 26, 2018 18:51:03 GMT 1
Going by these two photographs, it looks like it should be TWO sealing rings per side then?
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Post by dusty350 on Dec 26, 2018 19:00:33 GMT 1
Only 1 each side Dusty
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Post by earthman on Dec 26, 2018 20:11:26 GMT 1
Only 1 each side Dusty Thanks Dusty,.....any idea why some of us have found 2 sealing rings on one side? If Yamaha designed that gap to take just one, I'm kind of surprised that the nuts still go on and push the flange flush up to the barrel. I guess that my next step is to remove one of those rings on the right hand exhaust and see if there's no leaks etc.
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Post by dusty350 on Dec 26, 2018 20:59:16 GMT 1
I don't know why you have 2 on 1 side - maybe a previous owner thought it would stop a leak ? They are a crush type sealing ring, and some guys fit them with silicon goo to help try and stop the inevitable oily dribble they often develop. I have read a few times about guys using normal bath type silicon, but I would have thought a decent automotive silicon and new washers and a clean recess in the port to start with would be your best bet. Dusty
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Post by oldelsieboy on Dec 26, 2018 21:05:32 GMT 1
There are 2 types of barrels & 2 types of exhaust pipes. The early barrels exhaust gasket recess has a smaller diameter than the later barrels, the ones cast with a number 1 on the reed housing. When the warranty replacement pipes were fitted this gasket recess was filled with an aluminium spacer ring which was supplied with the pipes. The warranty replacement exhaust pipes were designed so the fixing flange when pulled tight to the end of the downpipe does not finish flush but forms a recess for the round crush type gasket to fit into. The later barrels, the type cast with a number 1, have a larger gasket recess which the crush gasket locates into, but the exhaust pipes designed for use with this barrel have a flush fitting flange. When the warranty pipes are fitted to the later barrels, because of the flange design described above, there are 2 gasket recesses to fill so 2 gaskets are required. If the later type of pipes are fitted to early barrels an original smaller diameter crush gasket is fitted to the barrel only. Hope that is clear OEB
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Post by earthman on Dec 26, 2018 22:46:44 GMT 1
There are 2 types of barrels & 2 types of exhaust pipes. The early barrels exhaust gasket recess has a smaller diameter than the later barrels, the ones cast with a number 1 on the reed housing. When the warranty replacement pipes were fitted this gasket recess was filled with an aluminium spacer ring which was supplied with the pipes. The warranty replacement exhaust pipes were designed so the fixing flange when pulled tight to the end of the downpipe does not finish flush but forms a recess for the round crush type gasket to fit into. The later barrels, the type cast with a number 1, have a larger gasket recess which the crush gasket locates into, but the exhaust pipes designed for use with this barrel have a flush fitting flange. When the warranty pipes are fitted to the later barrels, because of the flange design described above, there are 2 gasket recesses to fill so 2 gaskets are required. If the later type of pipes are fitted to early barrels an original smaller diameter crush gasket is fitted to the barrel only. Hope that is clear OEB Ah, the plot thickens, different exhausts too. I remember seeing the mention of a 44mm washer/seal some where, I'm guessing that that could be for the earlier barrels then, the seals on mine have an OD of about 54mm and an inner of 36mm.
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Post by earthman on Dec 26, 2018 22:59:21 GMT 1
"When the warranty pipes are fitted to the later barrels, because of the flange design described above, there are 2 gasket recesses to fill so 2 gaskets are required."
I would have thought that realistically this option would apply to the majority of LC's that have survived,.....most owners would have had the warranty work/pipes back in the day, and the fact that the Haynes manual shows the 2 gaskets.
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Post by oldelsieboy on Dec 26, 2018 23:02:17 GMT 1
"When the warranty pipes are fitted to the later barrels, because of the flange design described above, there are 2 gasket recesses to fill so 2 gaskets are required."I would have thought that realistically this option would apply to the majority of LC's that have survived,.....most owners would have had the warranty work/pipes back in the day, and the fact that the Haynes manual shows the 2 gaskets. Not really, 81/82 bikes had the later barrels & pipes from the factory. OEB
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Post by earthman on Dec 26, 2018 23:31:52 GMT 1
"When the warranty pipes are fitted to the later barrels, because of the flange design described above, there are 2 gasket recesses to fill so 2 gaskets are required."I would have thought that realistically this option would apply to the majority of LC's that have survived,.....most owners would have had the warranty work/pipes back in the day, and the fact that the Haynes manual shows the 2 gaskets. Not really, 81/82 bikes had the later barrels & pipes from the factory. OEB I'm pretty confused now,....if the last couple of years bikes had the latest barrels and pipes fitted from the factory, then going by your text, they would have 2 gaskets fitted? Well that's how I'm reading it.
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Post by oldelsieboy on Dec 26, 2018 23:47:49 GMT 1
Not really, 81/82 bikes had the later barrels & pipes from the factory. OEB I'm pretty confused now,....if the last couple of years bikes had the latest barrels and pipes fitted from the factory, then going by your text, they would have 2 gaskets fitted? Well that's how I'm reading it. The later barrels had specific pipes not warranty pipes. OEB
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Post by earthman on Dec 26, 2018 23:56:17 GMT 1
OK, if the barrels have a recess and the pipes have a ridge, which would 'hold' sealing rings in place, is that the biggest clue that two gaskets should be used?
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Post by oldelsieboy on Dec 27, 2018 9:51:19 GMT 1
If you have the later barrels & your exhaust header/flange looks like this you will probably need 2 gaskets. If the header/flange looks like this you will need only 1 gasket. OEB
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Post by earthman on Dec 27, 2018 14:32:18 GMT 1
Many thanks OEB, pictures make things so much clearer don't they.
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Post by earthman on Dec 27, 2018 14:40:44 GMT 1
I don't know why you have 2 on 1 side - maybe a previous owner thought it would stop a leak ? They are a crush type sealing ring, and some guys fit them with silicon goo to help try and stop the inevitable oily dribble they often develop. I have read a few times about guys using normal bath type silicon, but I would have thought a decent automotive silicon and new washers and a clean recess in the port to start with would be your best bet. Dusty I've not experienced any dribbles/leaks around that area, if other owners have, I wonder if it's down to just having the wrong gasket set up for the barrel/pipes that they have,...I didn't even think of the possibility of there being a few different set up's as such.
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Post by richclarke on Jan 8, 2019 18:55:01 GMT 1
Great thread. This explains a lot! Rich
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Post by steven on Jan 8, 2019 19:23:49 GMT 1
....and we havnt even got to the bit with coathangers/welding/brazing rods yet ! :-) Steven.
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Post by doohanno1 on Jan 8, 2019 20:00:32 GMT 1
....and we havnt even got to the bit with coathangers/welding/brazing rods yet ! :-) Steven. Yes note to self : don't use plastic or wooden coat hangers..who would of thought..😀
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