FE650 copper head gasket

Hello lads!
A lot has been said already, but I can confirm a couple of things, including Bushmechanics thoughts. I had problems when compression ratio was up to around 14,5:1. Thinking a threaded shaft (although 10.9) would cope, was naive. Even if the liner was shimmed up 0,1 mm, it blew the gasket(s) at once. So I purchased tall 12.8 bolts and cut threads on them. Together with 10.9 nuts and thick washers, OEM gaskets were just fine!

For 2014 I'm going for 104mm bore and moderate 13,5:1. I have got a sample MLS gasket from Merako, that looks very nice. Time will tell if it does the trick and keeps the fluids where they should? It will be appr. 0,35mm thick, on recommendation from Merako. Apparently that was the preferred thickness for "demanding" applications.

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very nice Spanner!

I used a 0.8mm guitar string in the iron liner with a 0.3mm deep slot

I think though that about 1mm or bigger would be better especially if you had a soft 100mm aluminum liner

I need to get some of those ARP head studs

Dr_C that is what I have learnt too .. initially from your story about the yamaha ... if you have enough crush at the fire ring nothing can get out ... I try not to feed my bike curried beans :badair: :rock:

I go to 100N.m on the JBS studs coz I have a big wrench and stuff

Yeah, I learnt a lot from my years with that challenging Yamaha... I had a water cut 1mm copper gasket and a steel wire (1mm) on top of the steel liner. If I recall correctly, it was crushing into the copper with 0,05-0,10mm. The gasket was softened (glowing) before each assembly. That worked very well. Unfortunately everything else broke...

Sent from my so called smart phone with tiny keyboard and annoying auto spell check.

Interesting to see these. Thanks for the pics.

its kind of inferred that i tried everything with the 105mm bore and a copper gasket

i didn't try a wire ring embedded in the liner + copper gasket + grooves to seal the water and oil

the wire ring I used was inserted inside a special groove i rolled into the ID of the gasket



http://scegaskets.com/

[youtube:2p5tx4qx]http://www.youtube.com/watch?v=V6uXkVbprj0[/youtube:2p5tx4qx]

in my case the wire ring just gets swallowed up by the gasket = not enough crush. the wire is a bit like a "cutting edge" .. when you embed it in the liner there is only one cutting edge, if it is inside the gasket there are 2 cutting edges

JBSs problems with the copper gaskets were not combustion pressures but with water getting into the oil which i didn't find to be a problem with 1207B in grooves on those areas

so don't be put off you can do it :twisted:

Copper Gasket Installation Instructions



While copper is an excellent gasket material, it does require special attention to achieve a long lasting seal. For best results, follow the installation instructions detailed below.

1. Check the fit of the gasket. If any dimensions are out of tolerance, don’t hesitate to notify us. We at Copper Gaskets Unlimited urge our customers to help us maintain our high standards as to the fit and design of our product.

2. Make sure all the sealing surfaces are very clean and dry. Once you are ready to install your CGU gaskets, be careful to touch only the edges. An oily fingerprint on the sealing surface can cause gasket failure.

3. When the surfaces are properly prepared, apply gasket sealer to both sides of your gasket only. We recommend Permatex Ultra Gray3294 sealer or Copper coat. Wait ten minutes for the sealer to cure.

4. Assemble the engine following OEM specifications, again making sure not to compromise the seal with oil or grease of any kind. During assembly, pay special attention to the condition of the threads on all nuts, bolts and studs. Dirt, rust
or other contamination can cause torque specs to be reached before proper bolt stretching occurs. Torque the head bolts to the recommended setting and in the proper sequences. After assembly, allow the sealer to fully cure for 24 hours, then start the engine and allow it to reach operating temperature. Then shut it down and recheck the torque on all the fasteners. When everything has again cooled, check the torque for a third time.

5. After the first time out with your machine, recheck the torque to be sure nothing has settled and lessened the pressure on your CGU gasket.

Follow these instructions, and your CGU gasket should last as long as the engine.






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