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Old Oct 08, 2012, 12:24 PM
I'm a pilot... 100 yrs to late
Thermalin's Avatar
USA, FL, Palm Harbor
Joined Jan 2005
3,423 Posts
Question
Looking for 4S Hot Glow Plug

Looking for a 4 stroke "hot" plug but cannot find one?
Also my 4 stroke magnums seem to run better, idle better with hot plugs. Do 4 strokes like hot plugs better than medium or is it "cool" plugs?

My issue is idle in an inverted 4 stroke and I read at the bottom hotter is better in this case?

Found this.. seems most helpful
http://www.scootworks.com/rdrc/gloplugs.html
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Last edited by Thermalin; Oct 08, 2012 at 12:29 PM.
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Old Oct 08, 2012, 12:32 PM
Registered User
United States, OR, Canby
Joined Aug 2011
2,120 Posts
The OS F is a very popular plug for 4 stroke.
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Old Oct 08, 2012, 12:37 PM
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tpasztor's Avatar
United States, TX, Lake Jackson
Joined Aug 2011
81 Posts
I think you could use a automatic glow igniter. When you bring your throttle down to idle it automatically puts power on your glow plug. It will improve idle and make starting a breeze.
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Old Oct 08, 2012, 03:43 PM
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fiery's Avatar
Hervey Bay, Queensland, Australia
Joined Mar 2008
515 Posts
Merlin make a four stroke plug that is a little "hotter" than the O.S. F.

Could be worth a try.
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Old Oct 08, 2012, 04:00 PM
Who Dat!
GeetarJoe's Avatar
United States, LA, New Orleans
Joined Sep 2011
650 Posts
the "hottest" 4 stroke plug i ever used was a Fox Miracle. good plug for running inverted.
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Old Oct 08, 2012, 09:32 PM
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jeffie8696's Avatar
United States, IA, Muscatine
Joined Oct 2009
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Merlin 2010, has cured a lot of 4S engine running issues for me.
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Old Oct 09, 2012, 08:01 PM
I'm a pilot... 100 yrs to late
Thermalin's Avatar
USA, FL, Palm Harbor
Joined Jan 2005
3,423 Posts
thanks.. i'll look up the merlin..

http://www.merlinglowplugs.com/Aircraft.html

13 beans shipped for one plug
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Old Oct 09, 2012, 09:42 PM
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Joined Oct 2004
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O.S. "F" plugs seemed to smooth out my Saito 90TS compared to the stock supplied plugs.
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Old Oct 10, 2012, 12:11 PM
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United States, IA, Muscatine
Joined Oct 2009
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Call and ask him about the free shipping for minimum orders, I think he still does it.
Saved me a lot of cash.
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