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richie_supercharged
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Joined: 12 Apr 2010
Posts: 555
Location: Newcastle

PostPosted: Sat Dec 01, 2012 4:43 pm Post subject: Plugs Reply with quote Back to top

What plugs are you guys running ?
My 82 runs a ngk BR8ES
my 84 which is modded and is a 290 its beeen that long scince a plugs been in it i cant remember what came out ..I'm sure I had a ngk B9ES in it
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84 ATC 250r (290kit)
82 ATC 250r
77 ATC 90
 
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ylwgtr
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Joined: 23 May 2012
Posts: 112

PostPosted: Sat Dec 01, 2012 5:35 pm Post subject: Reply with quote Back to top

i myself never run anything but egv plugs in any of my twostrokes.....much better performance.Its the first thing i do with any bike i buy.So on that id recommend a b9egv,b9ev or b9eg for your 84 model.Ive NEVER fouled a plug in my whole lifetime,sure ive had mechanical failures/ blocked jets/crap in the carb but not once been let down by these plugs
 
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richie_supercharged
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Joined: 12 Apr 2010
Posts: 555
Location: Newcastle

PostPosted: Sat Dec 01, 2012 5:51 pm Post subject: Reply with quote Back to top

Il use a ngk cause that's what I have handy
But il have a look for egv next time
Cheers mate
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84 ATC 250r (290kit)
82 ATC 250r
77 ATC 90
 
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Mart 300r
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Joined: 02 Jun 2008
Posts: 944

PostPosted: Sat Dec 01, 2012 7:06 pm Post subject: Reply with quote Back to top

The plugs ylwgtr is refering to are ngk mate, just instead of br or b9/8es
they are the thin tip ngk br b9/8egv.So for example if it was the heat range 8 you were after which by memory the airys are the 8's, you would be lookin for br8egv pretty sure the r stands for resistor by memory.They are a little more expensive but in my opinion like ylwgtr said they are worth it.Then of course you have the iridium's which do seem to work really well.Ive managed to foul a few in my long hard fight with my old airy back in the day although it wasnt a fuel fowling problem it was an electrical fault by memory.
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE
 
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richie_supercharged
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Joined: 12 Apr 2010
Posts: 555
Location: Newcastle

PostPosted: Sat Dec 01, 2012 7:23 pm Post subject: Reply with quote Back to top

Haha that proves I don't know anything about spark plugs
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84 ATC 250r (290kit)
82 ATC 250r
77 ATC 90
 
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HaggLE
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Joined: 16 Mar 2009
Posts: 511
Location: Newcastle

PostPosted: Sun Dec 02, 2012 8:14 am Post subject: Reply with quote Back to top

Skip on the R in the part number, you will have weaker spark with resister types. The resister stops electrical interference to other electronics. they started to be enforced in the 80's but it is at a cost to the plugs performance.

As for 8 vs 9, 8 is standard. Sometimes when you increase the performance of an engine the internal temperatures increase to the point where the ideal operating temp of the standard plug is exceeded and you need the higher range. Note that a higher range does not give better performance, it stops your plug from melting. Google for pics on how to tell when your heat range is wrong.
 
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richie_supercharged
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Joined: 12 Apr 2010
Posts: 555
Location: Newcastle

PostPosted: Sun Dec 02, 2012 8:36 am Post subject: Reply with quote Back to top

Thanks for the info
Its running on a B9ES. . I found out the one. . I had it written down Very Happy
But i have to split the cases again now i have no 2nd gear
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84 ATC 250r (290kit)
82 ATC 250r
77 ATC 90
 
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ForeverThreeWheels
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Joined: 18 Nov 2008
Posts: 1742
Location: Maitland

PostPosted: Sun Dec 02, 2012 7:48 pm Post subject: Reply with quote Back to top

I once got a plug that was in the wrong heat range and the trike ran crap. I run a b9es
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