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Author Topic: VHM cylinder head with decomp valve and interchangable combustion chamber dome.  (Read 1983 times)

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Offline demographic

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VHM cylinder head with decomp valve and interchangable combustion chamber dome.
« on: March 13, 2021, 05:54:58 AM »
Has anyone got one yet?

Any reviews?
Its looks a bit like John McCriricks watch but at least it will match the forks on a 90 model.
Just wonderin like, a mate who's finger slipped on the buy it now button wants to know... Ahem.


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Offline sandblaster

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Re: VHM cylinder head with decomp valve and interchangable combustion chamber dome.
« Reply #1 on: March 13, 2021, 06:42:43 AM »
His posted volumes are really low.
Stock volume is 42cc.
He posted: 45cc, 47cc, 49cc, 51cc
Running on applesauce?

I'm working with Phathead Racing.
He will have his version out soon with excellent dyno developed chamber sizes.

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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline demographic

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Re: VHM cylinder head with decomp valve and interchangable combustion chamber dome.
« Reply #2 on: March 13, 2021, 07:11:40 AM »
This one is for a road going supermoto.
As I'm not even close to being an engine tuner I'm not that clued up on deck heights and squish measurements.
Happy to learn though.

Oh and Hi Sandblaster, I  think I bought a rear subframe off you a few years ago. Was from Eugene Oregon and advertised on that aluminium chequer plate just like you take photos on.
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Offline sandblaster

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Re: VHM cylinder head with decomp valve and interchangable combustion chamber dome.
« Reply #3 on: March 13, 2021, 03:08:54 PM »
Save your money and send your head to Tom Morgan Racing.
Tell him to cut it to 13.5:1 compression and have him add a decomp.
More power, less money.
Then down the road buy a nice head with the correct dome.
I hope the subframe was good  8-)
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline demographic

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Re: VHM cylinder head with decomp valve and interchangable combustion chamber dome.
« Reply #4 on: March 13, 2021, 07:05:42 PM »
Quote from: sandblaster on March 13, 2021, 06:42:43 AM
His posted volumes are really low.
Stock volume is 42cc.
He posted: 45cc, 47cc, 49cc, 51cc
Running on applesauce?

I'm working with Phathead Racing.
He will have his version out soon with excellent dyno developed chamber sizes.


They do a 41cc dome and one thats uncut so the customer can do their own.
Actually for some reason your image hasn't shown and til I started to reply I didn't realise there was an image there.
I've signed into your forum (been a member for a while but mostly a lurker and not posting) and put that URL of that image into my address bar and this was my result.
"You are not authorised to download this attachment."
My guess is the image shows perfectly for you but nothing to me.

Oh and the subframe is fine, slight chain rub but every used KX 500 rear subframe I've ever seen has had that.
Not an issue and I know how to sort them so it doesn't get bad.

« Last Edit: March 13, 2021, 07:08:46 PM by demographic »
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