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Old 12-11-2010, 06:12 PM   #61
billiano
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Everything was ok for my YS91SR also except the fact..
that the copper ring which attached on the upper position of the sleeve
was bigger than the diameter of the head's flange so ..
it was not sealed completely flat and I had a small oil leak just underneath the spark plug.
I kept running the stock head ...
Now I think of removing a small part of the outter perimeter of the copper flange to test again the head..
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Old 12-11-2010, 07:55 PM   #62
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Does the sleeve fit ok ?

I mean if the sleeve fits perfectly so it is not a machining problem. Sometimes the shims doesn't seat perfectly and it gets squashed in between with a consequent leak. It happened on my stock SR once.

The nice thing about this head is that it works on the old SR and the new 3DS
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Old 01-19-2011, 08:26 PM   #63
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hey pulento how is the performance?how many gall?
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Old 01-20-2011, 05:44 AM   #64
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Does it fit the latest YS ? the SRS/SR-3DS ?
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Old 02-03-2011, 09:17 AM   #65
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Yes it fits. I installed it on one of my 3DS and it works just fine. Haven't flied it too much since I was on vacations and my ENV is waiting some spares. The few flights I made I was running a rich mid, this head delivers a bit more power on mid.

And I have to check RPMs since the ENV has 8.12 instead of 8.21 of the T700.
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Old 07-12-2012, 10:31 AM   #66
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Default ys 120

any one interested in a dual plug head for this engine?
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Old 07-12-2012, 01:05 PM   #67
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what about os 105/55hzr would def try that
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Old 07-12-2012, 01:36 PM   #68
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Smile os 105 an 55

Im working on the drawing right now!
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Old 07-12-2012, 02:35 PM   #69
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Would the 50 hyper would benefit from the duel plug?

stupid question but is the hyper 50 and the 55 the same head?
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Old 07-13-2012, 11:36 AM   #70
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Hi, I'm looking for a dual plug head for my ys 91 SR and am told the Viper head is not a good fit with the new YS engines. Can anyone here recommend one or have one for sale?

thanks,

John
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Old 07-13-2012, 11:51 AM   #71
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Quote:
Originally Posted by Jafa View Post
Cars and various engines use multiple spark plugs to get the flame front to travel sideways faster and then start pushing the piston down

You can get a smoother running engine

You can use two different heat ranges - makes the idle really smooth on one plug and the stunt mode really smooth on the other plug

Some argue that it's also a bit of a safety against a flame out due to loosing the plug in flight
Indeed:

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Old 07-13-2012, 11:51 AM   #72
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Default ys sr 91

I have a few in stock so let me know!
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Old 07-13-2012, 11:52 AM   #73
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betta, I e-mailed you via the address at the beginning of this thread, but received no response. What is your e-mail?

Yes, I'm interested.

thanks,

John

jsjb@sympatico.ca
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Old 07-13-2012, 12:05 PM   #74
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Betta2500@aol.com

Are u jhon?
If so i did receive an email and i did responded it!

Any way let me know!

Thank u!
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Old 07-13-2012, 08:11 PM   #75
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Quote:
Originally Posted by jgalen0025 View Post
what about os 105/55hzr would def try that
In the old days we used dual plug heads on the OS50
We never noticed any benefit

It's only on the 90's that we noticed benefits

I assume it would work well on the OS105/YS120
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Old 07-14-2012, 09:10 AM   #76
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Why is that it benefits only 90 size and not 55
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Old 07-14-2012, 09:33 AM   #77
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I have no idea why - that was our experience
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Old 08-29-2012, 01:23 PM   #78
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Default ys heads

finally anodize!
what u think?
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Old 08-29-2012, 03:18 PM   #79
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Are you doing any for the YS 120.....
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Old 08-29-2012, 03:23 PM   #80
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Yes,pretty soon!
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