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Post by JonW on Jan 10, 2016 23:53:17 GMT 1
Been offered a 4L0 part numbered head gasket with suffix -09, and it isnt the usual square looking edged gasket, more rounded like a ypvs unit. I always thought the OEMs were all rectangular and thought id check with the brains trust.  |
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Post by muttsnuts on Jan 11, 2016 12:34:51 GMT 1
only aware of the one, I know copy gaskets look more like YPVS ones, but only ever seen the usual LC head gasket when genuine, but you never know !
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Post by oldelsieboy on Jan 11, 2016 12:43:15 GMT 1
Been offered a 4L0 part numbered head gasket with suffix -09 4L0-11181-09 is the superseded part number. I have seen, on a popular online auction website, Yamaha branded LC gasket sets where the head gasket seems to be of the "rounded" variety  OEB |
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Post by JonW on Jan 11, 2016 12:49:21 GMT 1
Yeah this is a pic of one, do you think its not OEM?  |
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Post by oldelsieboy on Jan 11, 2016 12:52:35 GMT 1
Yeah this is a pic of one, do you think its not OEM? Looks like the one I remember seeing in an OEM top end rebuild gasket set OEB |
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Post by arrow on Jan 11, 2016 13:56:36 GMT 1
4L0-11181-09,
I think the above one is made from multiple layers. When you first see it you think "how the heck will that work". In practice it works very well and needs no additional sealant, as it comes pre-coated with its own.
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Post by Wanderer on Jan 11, 2016 14:41:07 GMT 1
Do you mean one like this Gary, difference is, this one is for 250  URL=http://s1152.photobucket.com/user/duckams/media/DSCF3486.jpg.html]  [/URL] Fitted one exactly the same as you have Jon came from Malaysia never had a problem no sealant, no coolant put it through a heat cycle let it cool re-torque in with the coolant happy days  |
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Post by Norbo on Jan 11, 2016 15:16:19 GMT 1
Its all ready been answered in the pics but yes 2 head gaskets the old type and the black type that are made similar to the ypvs ones .
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Post by arrow on Jan 11, 2016 17:26:02 GMT 1
Do you mean one like this Gary, difference is, this one is for 250 URL=http://s1152.photobucket.com/user/duckams/media/DSCF3486.jpg.html] [/URL] Fitted one exactly the same as you have Jon came from Malaysia never had a problem no sealant, no coolant put it through a heat cycle let it cool re-torque in with the coolant happy days [/quote] Yes, that's the one. |
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Post by JonW on Jan 11, 2016 22:03:58 GMT 1
Cool, thanks guys, so it seems there are two types, both are original and OEM and fine for the 4L0.
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Post by bare on Jan 13, 2016 5:54:07 GMT 1
Old style? pressed fiber type HG was thick.. surprisingly thick, which when coupled with the stepped comb chamber made for seriously constrained HP.
Explaining the why of ~37 hp on a factory fresh 350LC .
Valvie style ie; 3 tin leaves is Much thinner.. Maybe it allows a couple of more hp? as well.
Fairly common to separate the 3 leaves and use the individual pieces for Squish tuning.
IMO neither type is 'Fine', used as found in the Yama Baggie.
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Post by Wanderer on Jan 13, 2016 22:04:35 GMT 1
IMO neither type is 'Fine' Ok clever clogs what do you recommended, both still available both do the job.... successfully , so i think that statement is a bit contradicting |
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Post by rigga on Jan 13, 2016 22:50:31 GMT 1
Bare I think means, that to be optimum neither out of the bag is ideal, can be made so with fettling.
Not to be confused with its ok to fit and work ok (just not perfect)
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Post by JonW on Jan 13, 2016 23:54:51 GMT 1
I took that to be bare's meaning as well, tho it was a bit convoluted, rare for bare as hes usually quite forthright Ok, so the 1 piece rounded end gasket is too thick, so i need the square end one, especially if i want to adjust my squish by taking out leaves. This does make me wonder if an aftermarket 'leaves' version might work for me, I know we all bang on about OEM HGs being the only ones to use, but after whats been said here I do wonder... |
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Post by muttsnuts on Jan 14, 2016 11:08:51 GMT 1
I use single leaves out of a steel HG for my track/road bikes with a little gasket sealant, works well, I don't do it on customer bikes unless they ask or are happy with it as I don't want the problem of leaks, but it does help a lot with the squish by using one very thin steel leave - think the middle one is about 0.3mm thick as opposed to about 1mm thick for the standard steel 3 leave HG
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Post by JonW on Jan 14, 2016 12:13:29 GMT 1
Yes thats what I have been wondering from the start, and if im going to use sealant anyway, may as well use an no OEM LOL
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mboddy
Weekend rider
Posts: 58
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Post by mboddy on Jan 14, 2016 13:14:31 GMT 1
Use copper spray.  |
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Post by Wanderer on Jan 14, 2016 20:21:37 GMT 1
Apologies to Bare for misunderstanding his post, but the initial question was 4L0 oem gaskets, and the posts that came back were yes there are two types, one fibre and multi layered type which are still available, i understand the disadvantages of fitting oem gaskets as far as thicknes squish loss hp etc, but as far as fitting a head gasket i was always steered towards fitting genuine as above and not cheap and cheerful
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Post by Tobyjugs on Jan 14, 2016 22:14:44 GMT 1
The middle one is just flat whereas the thin plates a profiled and give a better seal.
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