Yamaha Head Job


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Post Sun Sep 19, 2010 11:39 pm

Yamaha Head Job

Little rebuild thread...

After stripping off the bodywork revelling underneath a fine looking machine :shifty:
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Cams come out :thumbup:
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Piston and bore a little warn but still serviceable... will be replacing it with a 290cc kit later on. :thumbup:
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Nothing looking amiss here :think: lets pop the valves out, being a Yamaha there's five very small titanium valves.
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Oh dear the valve seats are completely lacking nice sharp edges, you should see 3 distinct angles :blink:
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The valve has been hammered into a mushroom shape, the edge is sharp enough to cut your finger :wtf:
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My new steel Zoom Factory valves bought from ebay at a discount, now sent with cylinder head to have new seats cut, shimmed up by Zoom :lol:
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Post Wed Sep 22, 2010 6:54 pm

Re: Yamaha Head Job

Cylinder is back from Zoom and I'm impressed with the work..I'll take some pictures tomorrow when the lights better :thumbup:
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Post Wed Sep 22, 2010 7:00 pm

Re: Yamaha Head Job

Nice one, BTW it could do with a good clean whilst you are at it :lol:
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Post Wed Sep 22, 2010 7:23 pm

Re: Yamaha Head Job

Pepperami wrote:Nice one, BTW it could do with a good clean whilst you are at it :lol:


Clean!!?? :blink: :lol: it's actually come back nice a clean ready to bolt on, even cleaned the exhaust ports 8) The outside still looks scummy but I suspect they did want to try and dissolve the cylinder head in a strong acid mix, only bead blasting will get those stains out :lol:
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Post Wed Sep 22, 2010 7:28 pm

Re: Yamaha Head Job

Manny wrote:
Pepperami wrote:only bead blasting will get those stains out :lol:


I was talking about your bike not your'e underpants. :clap:
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Post Wed Sep 22, 2010 7:31 pm

Re: Yamaha Head Job

lol I use Daz instead :shh:
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Post Wed Sep 22, 2010 7:56 pm

Re: Yamaha Head Job

Manny wrote:lol I use Daz instead :shh:

Does he mind? :mrgreen:
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Post Wed Sep 22, 2010 8:09 pm

Re: Yamaha Head Job

Pepperami wrote:
Manny wrote:lol I use Daz instead :shh:

Does he mind? :mrgreen:


Fell into that one :lol:
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Post Wed Sep 22, 2010 8:11 pm

Re: Yamaha Head Job

:thumbup: :mrgreen:
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Post Fri Sep 24, 2010 8:19 pm

Re: Yamaha Head Job

The Rebuild ..

Got the cylinder head back on Wednesday as I had no work on Thursdays decide to do the bike prep that day.

Looking sweet!
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Cams
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Exhaust port de-coked
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All back together
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Timed up nicely
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I stopped taking photos after that because I could not believe what happened next...Natterjack without any drama? not going to happen :lol:

I hit the starter button expecting it to fire into life, instead it whirls around like crazy :wtf: I thought the starter was not engaging at first so gave it a few more prods... then it dawned on me that the camchain might have jumped the sprocket and I was beating the dolalis out of the valves. :blink: ..you know that sickening feeling you get? That was me all over :sick:

So anyway to cut a long story sort the camchain had jumped the crank sprocket, how the hell it managed to do that only Gods knows because the is no room between the sliders and the chain. It was only luck that both set of valves were closed so no damage but it did mean another complete strip and had to re-use the head gasket :(

Will find out tomorrow if it holds up :mrgreen: now it fires up first rotation of the starter hot or cold and you can feel the extra compression when kicking :thumbup:

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