colbox
L plate rider.
Posts: 41
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Post by colbox on Apr 12, 2021 12:54:52 GMT 1
I am fitting a new gen yam head gasket to my350 4LO do you need any extra gasket seal or a can you just fit it on it’s own the previous owner added extra black sealant which was a b::::add to get off thanks Colin
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Post by 29davyt on Apr 12, 2021 13:04:01 GMT 1
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Post by liffy16 on Apr 12, 2021 15:19:30 GMT 1
Ypu should never put sealant on a head gasket, but some do??,I don't anyway
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Post by Chewie01 on Apr 12, 2021 16:20:46 GMT 1
I don't and neither did Yamaha in the factory.
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Post by bare on Apr 12, 2021 16:28:48 GMT 1
Actually Yama HG's come spritzed with sealant.. Laquer. One can respritz a used HG with rattle can Laquer (your choice of colour) Which works well... for as many times as the stamped in ridges are still usable
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Post by arrow on Apr 12, 2021 20:31:00 GMT 1
I am fitting a new gen yam head gasket to my350 4LO do you need any extra gasket seal or a can you just fit it on it’s own the previous owner added extra black sealant which was a b::::add to get off thanks Colin Are you sure the previous owner did this? I used a gen gasket and some months later it was properly stuck down and left black sealant everywhere, which was a pig to remove. The gen gasket has a special coating. I fitted mine without any additional sealant.
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colbox
L plate rider.
Posts: 41
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Post by colbox on Apr 13, 2021 10:20:09 GMT 1
Thanks for the answers
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Post by jessy03 on Apr 13, 2021 10:24:42 GMT 1
I’ve used genuine ones before and they still leaked even doing everything by the book, I make sure everything is vapour blastered washed and clean then apply a couple of passes with some permatex spray applied sealer. Just my preferred way though. Jess
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Post by JonW on Apr 13, 2021 13:38:58 GMT 1
I now also use copper spray as has been said, I used to fit them dry back in the day but now they often leak.
I only ever use OEM gaskets on the cyls.
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Post by blaine on Apr 13, 2021 15:39:10 GMT 1
It's one of those subjects where there are different approaches that work, we tend to find one and stay with it.
My take is if genuine and new use as is.
For aftermarket or reused genuine I'll spray on a couple of coats of hairspray (I certainly don't need it for my hair as it makes the bald areas too shiny!) and let it dry prior to fitting.
Personally I place the barrels on then the head gasket and head and nip up the head bolts BEFORE the barrel to engine nuts.
I'll then torque up everything and heat cycle, then recheck torques.
Then when tidying up I find a gudgeon pin clip and disassemble..... 🥴
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Post by huxley on Apr 13, 2021 15:52:04 GMT 1
I have used genuine yamaha gaskets and some leak and some don,t. Probably depends on the condition of the mating surfaces.
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Post by chrisg on Apr 13, 2021 17:55:35 GMT 1
Not sure if this only applies to British bikes with copper head gaskets, but I was told to use a bit of grease to allow the copper to seat properly when being torqued down. Might be an old "husbands" tale, not sure.
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Post by 4l04ever on Apr 13, 2021 18:05:33 GMT 1
If the head gasket leaks after fitting, you may have uneven tops on your cylinders and/or non-flat head. My engine man can skim your cylinders as a pair if required to get a perfect seal.
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Post by arrow on Apr 13, 2021 18:24:57 GMT 1
If the head gasket leaks after fitting, you may have uneven tops on your cylinders and/or non-flat head. My engine man can skim your cylinders as a pair if required to get a perfect seal. Very important and much over looked in my opinion, the barrel height. 2 thou would cause a problem I would imagine. May be they were finished 'as a pair' in the factory, who knows?
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Post by rich on Apr 13, 2021 22:44:49 GMT 1
Also be sure to retorque the head after a full heat/cool down cycle.
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Post by damiensk on Apr 14, 2021 22:22:13 GMT 1
Gents, following on, just in the process of getting my 4L0 barrels and head looked at, and getting machined cleaned if it its required. i already own a never used athena head gasket ( which a few peeps rated), but do i go gen yam for £50+, especially if the barrels/head end up getting a skim, or stick with the athena?
thanks for any replies
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Post by 4l04ever on Apr 15, 2021 10:23:43 GMT 1
I have used a pattern metal laminated 4L0 head gasket after having the top of my cylinders skimmed with no issue. I just used a slightly thicker (0.8mm) base gasket to compensate.
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Post by liffy16 on Apr 15, 2021 10:37:21 GMT 1
Have been using the Taiwanese head gaskets of late and they have been performing fine you do need to torque them down a bit more though.
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Post by beardy on Apr 15, 2021 16:02:09 GMT 1
Have been using the Taiwanese head gaskets of late and they have been performing fine you do need to torque them down a bit more though. What like 18/20 ftlbs? Years since I’ve done one but all this talk of head gaskets and O ring conversions will get my lc jealous.
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Post by huxley on Apr 15, 2021 16:04:01 GMT 1
Swings and roundabouts. I have used genuine and they have leaked and sealed. I have also had the same with pattern gaskets. The original are very expensive.
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Post by abar121 on Apr 15, 2021 16:50:11 GMT 1
I have used the Athena full gasket sets including head and not had a problem. YMMV!
Original crank seals on Yams.
MF crank seals are commonly used on Triples (as supplied by Chris Appleby's, ZPower etc), no problem so far with mine.
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Post by stanlc7189 on Apr 16, 2021 19:45:11 GMT 1
I have used the same gen Yam gasket for the last three head removals with no problems. They are pricey, but re-useable a few times in my experience.
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Post by damiensk on Apr 20, 2022 14:13:04 GMT 1
gents,
i have now had the head/barrels skimmed, so am i ok to use the athena barrel gaskets, and a OEM head gasket? also will i need to adjust the timing?
thanks
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Post by arrow on Apr 20, 2022 14:34:32 GMT 1
Assuming the timing was correct before, the above procedure won't affect the setting, ie it will still be 'X' value. However; if the motor is running higher compression then you may want to retard it slightly. You may also need to do a squish clearance test, and compression test to know where you're at.
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Post by 4l04ever on Apr 20, 2022 16:14:36 GMT 1
If you know how much material was removed from head and cylinders, you can use a thicker base gasket to make up the difference.
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Post by headcoats on Apr 20, 2022 17:00:59 GMT 1
Plus don't forget the head bolts need re torque 2 or 3 times after heat cycles to settle them down
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Post by Tobyjugs on Apr 20, 2022 22:22:24 GMT 1
gents, i have now had the head/barrels skimmed, so am i ok to use the athena barrel gaskets, and a OEM head gasket? also will i need to adjust the timing? thanks You don't mention what has been done to your barrels. I suggest you measure the squish height and inform us on this thread. Don't worry about your timing too much and set it was standard. We are all professor's with different ideas. Just try to keep to the standard tolerances unless you want more performance
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Post by muttsnuts on Apr 21, 2022 8:16:28 GMT 1
make sure your head bolts aren't bottoming out, if the head has had a lot taken off, the bolts may bottom out before clamping the head to the barrels properly, also make sure you have the washers under the head bolts as well
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Post by liffy16 on Apr 21, 2022 11:04:32 GMT 1
Just to add had problems with my pv head gasket even though I had flatted head on surface table, this time I also removed studs from barrels and flatted these on surface table then checked barrel heights,within a thou of each other👍and so far so good she's flying again 🤞
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Post by damiensk on Apr 25, 2022 13:21:04 GMT 1
gents, i have now had the head/barrels skimmed, so am i ok to use the athena barrel gaskets, and a OEM head gasket? also will i need to adjust the timing? thanks You don't mention what has been done to your barrels. I suggest you measure the squish height and inform us on this thread. Don't worry about your timing too much and set it was standard. We are all professor's with different ideas. Just try to keep to the standard tolerances unless you want more performance sorry, should of said earlier. this is what the chap told how much was skimmed off. Barrels 0.008 Head 0.010 I'm hoping that they are still within tolerance levels? Athena barrel gaskets to be used along with OEM head gasket, unless i can use the Athena gasket i have? unless something else is recommended thanks
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