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goo temperature
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justin ball
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July 15, 2020 - 9:01 pm
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slight carb to head intake leak resolved- maybe. will give gasket goo in morning. i have 625 f temp goo. is that good enough? can i use same temp goo for head?

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mikef
Chatham Kent
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July 15, 2020 - 9:55 pm
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Hi Justin.
      The head gasket doesn't normally need any sealant. They are fitted dry. It is important to torque the head nuts to 18 to 20 ft/lbs or about 25.75NM.
If the head gasket still leaks when torqued correctly then it suggests that the head surface maybe warped. The old cure is to place a piece of 600 grade wet or dry paper on a piece of plate glass and rub the surface of the head on this in a circular motion to flatten it.
I have just tried the above technique on a second hand cylinder head that I had problems to seal and it has worked for me.
Mike.

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justin ball
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July 15, 2020 - 11:02 pm
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I was hoping the goo (what temperature?) might fix and tiny problem that remains. If that fails, I'll flatten the head as you suggest

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SpacedMarine
Up north
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July 16, 2020 - 9:00 am
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As Mike says head gasket goes on dry.

What's 7/16 in mm again?

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bantammad
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July 16, 2020 - 10:12 am
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Hi just an input on a BSA  instruction manuals from years gone by how to tighten head nuts bolts torque settings done by (feel ) states And quote  tighten head nuts let it stand then tighten up some more funny . But common practice year’s gone by engine head Bolts we’re torqued down in stages well still are In fact maybe interesting to someone Les 

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Sponge
Lancashire (A chip shop somewhere near Preston)
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July 16, 2020 - 10:16 am
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Just advice mate but whilst the head is off,  it is easier to flatten it as described above and then re-fit it dry than to have to deal with scraping goo off the head (soft alloy ...) every time it blows out in future.  If your head is already uneven now it is unlikely that goo will prevent further leaks. 

Of course...... this is only advise........

Sponge 

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justin ball
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July 17, 2020 - 7:59 pm
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Clean 800 grit wet dry, light oil, circular motion, everything came up clean with a few rotations. Did a few more. The head is flat. No high low spots (ground/unground). Head back on, bolts up to 18ft pounds, x fashion of course. 625f goo both sides of the re-used gasket for the carb. Torqued down good. New throttle cable, reconstituted fittings. Kicked and ran on third go. Up and down the block, 100 yards. Damn noisy without the air filter. Getting a new pancake one tonight, ebay. I'll take it out in the morning to see if it runs any better with a thin clean sock zap strapped in place.

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justin ball
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July 18, 2020 - 4:02 pm
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Bike back in one piece, plug chop x 2 tan plug. No surging from carb, no binding of throttle cable (full left lock, 2000 rpm!!). Idles great, goes the same midrange, waiting for a long stretch tomorrow.

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Stoo63
GLASGOW
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July 18, 2020 - 7:59 pm
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Excellent stuff, Justin. Now for the sidecar.....(jealous)

 '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA;  '76 FS1-E; '97 Honda Sky SGX50.

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justin ball
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July 19, 2020 - 3:57 pm
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I have a 1946 Watsonian double adult chair, frame, wheel, mudguard, all there, £250.

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Stoo63
GLASGOW
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July 19, 2020 - 6:39 pm
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Oooo sounds nice. I've been looking for something for a nice one for ages to fit to my 5Ta, then ultimately my Sq4(when it lives)

 '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA;  '76 FS1-E; '97 Honda Sky SGX50.

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