I tried the three plug head today, seems to be good, once the engine is run in i'll know for certain (only two tanks as it was too cold on the fingers)

How was I to know she had a wooden leg

Nice work I like

Blade3d

2 enya 3's on the outside os8 in the middle, I'm hoping for big things with is head, has anyone else heard of a 3 plug head?

How was I to know she had a wooden leg

"Now I am going out on the back porch and enjoy an adult beverage and listen to the birds sing"

Kangarooster you really are a tool.

z

I think he enjoyed a few before he posted here.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

BA, whats your theory behind 3 plugs.

Don't see any advantage,,

Colin..

Only Quote From Experience.

The entire point of this thread and modification is to make the flame front go sideways faster before it starts to push down on the piston - this is an important aspect of combustion multiple plugs aid this

Three plugs was just an experiement - I would be keen to hear how well it goes in hard 3D (I may even get BA to do the three plug mod to my YS)

Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

Remember you seen it here first

How was I to know she had a wooden leg

The YS head is so easy to work on, the top of the head is flat so it lends itself to be worked on anyway up, a radius on the top of the head is a pain but 'we will over come'

How was I to know she had a wooden leg

mmmmmmmm 3 plugs in my head !!!!!!! just going down the field for a fly will let you know how i get on !!!!

well what a success , the os 70 was much better with the twin plugs it idles better and is much smoother on spoolup its quite reasuring knowing there are 2 plugs thanks to BA for his effort . simon

Had a chance to fly B,A's Vibe with the triple plug head today.

All I can say is that this thing is awsome, it will out pull my Stratus on an SZ.

I can't belive that I am now going to dump the SZ's to go back to Y.S and triple plug.

Nice good news.. I've always ran double plugs when ever possible I have a Viper on my SZ hyper and it does make a difference. People should take you up on your offer. I'll be shipping mine out tomorrow.
can you put one on the Hyper SZ head I know it's kinda big.

Blade3d

Has Pinkbike been booted off by RR

How was I to know she had a wooden leg

Dam, another comrade missing in action...

How does the three plug head go in hard 3D?

Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

I'm still running the engine in, so to be fair another gallon ought to be put through, full power climb outs are outstanding!!! it's the British weather thats holding me back.
Loops, rolls, tick tocks etc etc are performed with ease and it's still rich. As i said i am expecting big things from this engine.

How was I to know she had a wooden leg

quote]"Have u considered the fact that each plug you add your lowering the compresion of the engine ????"

Yes you will lose slight compression, this is where the shims come into play[/quote]

Question. Are you suggesting removing the stock shim to increase compression? There is one stock shim in the YS91 but you used the plural 'shims' so are you adding shims to your modified head motor. That would decrease the compression.

If I remove the shim in my stock motor and will I have more power or will the timing be changed such that there is no advantage to removing the shim?

Charles

Please stand by for faster service!

The 3 plug engine is still on the standard shim, and believe me it's phenomenal. I have to loosen off the centre plug to start it so compression is not a problem at this present moment time.

How was I to know she had a wooden leg

'Dam, another comrade missing in action...'

No way dude, just took a break from proceedings.
BA Can I have a 7 plug head, I am feeling flush this month?

www.kickstartphotography.com

only if your a good boy

How was I to know she had a wooden leg