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Post by hardhatharry on Jul 22, 2016 16:41:47 GMT 1
Howdee all
My Hybrid LC running a 31k YPVS engine goes like stink with 2.25 pistons in until the head gasket fails (then it goes even faster until the water runs out)
The head gasket fails quite regularly so some investigation work was done and found that at tdc the edge of the piston touches the edge of the gasket causing premature failure.
So what are my options?
Do they do a big bore head gasket or is it o ring the head?
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Post by LC_BOTT on Jul 22, 2016 17:25:43 GMT 1
I've read this before on here, I think I'd try a copper head gasket, and file it out, slightly bigger than the piston diameter, only cost about £20 I believe
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Post by hardhatharry on Jul 22, 2016 17:43:07 GMT 1
just chucked in an ebay search for ypvs copper head gasket and found someone who can manufacture bigger than 2.25mm overbore on request so I have requested 2.25 and see what he says
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Post by 4l04ever on Jul 22, 2016 17:53:51 GMT 1
You might need a little clearance to allow for centering etc. Maybe go for 2.5mm over?
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Post by oldelsieboy on Jul 22, 2016 17:54:59 GMT 1
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Post by hardhatharry on Jul 22, 2016 18:09:23 GMT 1
might be the same person as the ebay guy, pictures are the same |
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Post by oldelsieboy on Jul 22, 2016 18:12:04 GMT 1
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Post by hardhatharry on Jul 22, 2016 18:16:45 GMT 1
Cool I have asked to join the group |
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Post by yamark on Jul 22, 2016 19:07:41 GMT 1
That is Stuart, or Stu as he prefers. He is Stuboy on here. Phone him on his mobile at the bottom of his web page. Stu made my copper head gaskets for the 550 triple (details in my build thread ), he is the nicest guy to deal with, fast, efficient, helpful and very reasonable.
Use him, I think he's brilliant  |
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Post by mattybeckett on Jul 22, 2016 19:17:25 GMT 1
Howdee all My Hybrid LC running a 31k YPVS engine goes like stink with 2.25 pistons in until the head gasket fails (then it goes even faster until the water runs out) The head gasket fails quite regularly so some investigation work was done and found that at tdc the edge of the piston touches the edge of the gasket causing premature failure. So what are my options? Do they do a big bore head gasket or is it o ring the head? |
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Post by mattybeckett on Jul 22, 2016 19:22:29 GMT 1
I've read this before on here, I think I'd try a copper head gasket, and file it out, slightly bigger than the piston diameter, only cost about £20 I believe |
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Post by muttsnuts on Jul 22, 2016 22:30:07 GMT 1
yeah, that's Stuboy, he will sort you out, stock head gaskets are normally between 65mm to 65.5mm in diameter, after that you need to trim them out by hand (dremel), or get one purpose made, that's where Stuboy comes in
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Post by Eyrey1 on Jul 22, 2016 22:55:46 GMT 1
click reply at bottom right
a screen comes up write what you want and press post tab in the bottom right i think it is
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Post by stargixxer on Jul 25, 2016 21:09:46 GMT 1
I've done a bit of digging into this, as I've got +2.25 pistons and they're miles bigger than the holes in the standard Yamaha gasket.
Whats the general consensus here... dremel out the genuine gasket or get a copper one (with the inherent things to do to make it seal perfect)?
cheers
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Post by jon on Jul 25, 2016 22:02:19 GMT 1
Howdee all My Hybrid LC running a 31k YPVS engine goes like stink with 2.25 pistons in until the head gasket fails (then it goes even faster until the water runs out) The head gasket fails quite regularly so some investigation work was done and found that at tdc the edge of the piston touches the edge of the gasket causing premature failure. So what are my options? Do they do a big bore head gasket or is it o ring the head? One option not mentioned yet is to o-ring the head or barrels. I would recommend the head as it can be re-used once your last chance barrels are worn out. Jon |
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Post by stargixxer on Jul 25, 2016 22:11:06 GMT 1
Hmmm, who/where can do that? I was about to bang all mine together this week....
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Post by rigga on Jul 26, 2016 8:43:26 GMT 1
Dean Ryde at Metmachex can O ring heads
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Post by holty on Jul 26, 2016 9:11:11 GMT 1
ive got + 2.25 pistons in my 4lo, i knew about the head gasket problems so opted for a head which had o rings fitted, i got it from dean, you must tell him the size of the pistons so it can be opened out to the correct size, they have 2 o rings on each cylinder,one to seal the cylinder and the secod to seal the coolant passages, a very nice bit of kit, wasnt cheap but well worth the money.
holty
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Post by doohanno1 on Jul 26, 2016 22:51:18 GMT 1
Howdee all My Hybrid LC running a 31k YPVS engine goes like stink with 2.25 pistons in until the head gasket fails (then it goes even faster until the water runs out) The head gasket fails quite regularly so some investigation work was done and found that at tdc the edge of the piston touches the edge of the gasket causing premature failure. So what are my options? Do they do a big bore head gasket or is it o ring the head? I think your blessed that it did not detonate and cause a heat seizure as happened in my case.. |
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Post by yazza54 on Jul 27, 2016 7:32:02 GMT 1
Dean Ryde at Metmachex can O ring heads He's left and setting up on his own |
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Post by rigga on Jul 27, 2016 7:56:24 GMT 1
Dean Ryde at Metmachex can O ring heads He's left and setting up on his own Interesting as it was his own company, so leaving to set up another? |
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Post by yazza54 on Jul 27, 2016 8:49:50 GMT 1
He's left and setting up on his own Interesting as it was his own company, so leaving to set up another? I think it was more a family business than his, sounded like a bit of a spat with his old man from what I saw on Facebook. Anyway - the new company is called Billet World but he says he won't be set up for a couple of weeks yet I'm sure there's other people who could do the head for you, maybe Mark Dent at Performance Fabrication? |
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Post by hardhatharry on Jul 27, 2016 10:36:12 GMT 1
Howdee all My Hybrid LC running a 31k YPVS engine goes like stink with 2.25 pistons in until the head gasket fails (then it goes even faster until the water runs out) The head gasket fails quite regularly so some investigation work was done and found that at tdc the edge of the piston touches the edge of the gasket causing premature failure. So what are my options? Do they do a big bore head gasket or is it o ring the head? I think your blessed that it did not detonate and cause a heat seizure as happened in my case.. Looked at the head no evidence of detonation and pistons look good too |
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Post by hardhatharry on Jul 27, 2016 22:04:28 GMT 1
Copper gasket with copper gasket goo fitted and fired up looks good so far  |
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Post by twostrokebrit on Jul 28, 2016 18:08:04 GMT 1
rear wheel and pipes looks ace from that angle
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Post by headcoats on Jul 28, 2016 19:19:04 GMT 1
Aren't copper gaskets problematic too though ?
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Post by hardhatharry on Aug 3, 2016 22:31:11 GMT 1
Went out tonight on the LC, great going to the pub but on the way back the temp soared....arrgghh, managed to nurse it home.
Not much water in the rad and the top popped of the water bottle, looks like head gasket again, will look in the light tomorrow.
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begbie
Drag-strip hero
Posts: 249 
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Post by begbie on Aug 3, 2016 22:49:08 GMT 1
Copper head gaskets really need a fire ring set in the top of the cylinder. get someone to bore a stock gasket to the correct size, but first check all mating sufaces for trueness and damage.
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Post by hardhatharry on Aug 3, 2016 22:55:47 GMT 1
Copper head gaskets really need a fire ring set in the top of the cylinder. get someone to bore a stock gasket to the correct size, but first check all mating sufaces for trueness and damage. Already checked the mating surfaces, they are all good. Dunno what a fire ring is, I assumed thats what you got the next day after a curry. I have a new Yam gasket in the parts drawer but how do you bore it with any accuracy without damaging it? |
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Post by twostrokebrit on Aug 4, 2016 17:45:31 GMT 1
Copper head gaskets really need a fire ring set in the top of the cylinder. get someone to bore a stock gasket to the correct size, but first check all mating sufaces for trueness and damage. Already checked the mating surfaces, they are all good. Dunno what a fire ring is, I assumed thats what you got the next day after a curry. I have a new Yam gasket in the parts drawer but how do you bore it with any accuracy without damaging it? you would lightly clamp it between two peices of say ali and bore through. |
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