Spark Plugs.... - Honda TRX Forums: Honda TRX 450R Forum

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Old 11-13-2005, 08:48 PM   #1 (permalink)
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Hey guys... have a quick question for ya... does anyone run a different type of plug other than the Honda Factory NGK Iridium coated plug (IFR7L11 / IFR8L11)? at almost 20bucks a pop and (according to Honda) your not suppose to clean this type of plug... this can get real expensive REPLACING a fouled plug..... What are you guys running just for play... and does this plug make more HP than others? Does anyone know for sure??? thanx...
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**06 450ER**... #3 (Dale lives on)

86TRX250R (mostly stock 66mm bore x 72mm stroke) **for sale**
86TRX250R (ESR310 72.5mm bore x 72mm stroke '298cc' fully modded) **SOLD**
88TRX250R (ESR330 77.5mm bore x 74mm stroker '345cc' fully modded)

HRC kit (all but gone)
Hot Cams stage III
Okie porting w/ATP CV4 springs (36mm Ti/31mm)
Venom/KBR N2O Porting w/KW springs (37mm/31mm)
Venom/KBR 487 100mm 14.25:1 piston
Cold Fusion Nitrous**
Venom 'QP' pipe
ESR Pro Series pipe
ESR modded intake w/RAT stack
42mm Taper-Bored FCR
Direct Drive clutch lockout, CR500 springs
GT Thunder-Link w/Durablue Lowering Link
Durablue Anti-Sway Bar
Modded shock mounts
Rage Modded Tranny

Jetting/Carb: #168, #45slow, NGPR needle 3rd clip, #55 Leakjet, Pilot 2 turns out.
Jetting/N2O: 22N/21F (22hp)

*STU Comp Cut 21x12x8 (6) paddle 'Padla Brats' on Douglas Blue label 8x8.....

Thanx to: Venom/KBR (Mixxer/Kam), Rage ATV (Dee), Sredum (Chris), and many ORG members
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Old 11-14-2005, 08:47 AM   #2 (permalink)
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Quote:
Originally posted by 450RRR@Nov 13 2005, 08:48 PM
Hey guys... have a quick question for ya... does anyone run a different type of plug other than the Honda Factory NGK Iridium coated plug (IFR7L11 / IFR8L11)?* at almost 20bucks a pop and (according to Honda) your not suppose to clean this type of plug... this can get real expensive REPLACING a fouled plug.....* What are you guys running just for play... and does this plug make more HP than others?* Does anyone know for sure???* thanx...
[snapback]158360[/snapback]
That's pretty much what you need to use. Did you foul it or are you just wanting a spare?
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Old 11-14-2005, 10:57 AM   #3 (permalink)
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Hey Redish...well, not sure.. it just stopped... and I mean...STOPPED.. looks clean...light brown color....only a couple of hours on it.... my bike wouldnt start... checked the plug..and no fire.. checked spark TO the plug...(the hard way)... and Zappo....so I changed the plug to a new plug of same type...and it fired right up... BUT...what do I do with a 20 dollar plug w/only 2 hours of use? is there no 'replacement' plug which works? like the ole NGK 'V' plugs...etc.. I assume these are 'Resistor' plugs... so what about an NGK BR8EV....these were the race plugs of the 90's...same thread and length....BUT...the BR8EV is about 1/32" shorter from tip of electrode to base....Im not sure how this will effect performance for igniting the fuel at a 'slightly' different location in the chamber....has anyone ever DYNO'd their machine w/different plugs....or at different plug angles...(we used to have shims to allow us to turn the plugs electrode at a different location inside the combustion chamber)..not sure if anyone still does that....just curious...thanx...
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**06 450ER**... #3 (Dale lives on)

86TRX250R (mostly stock 66mm bore x 72mm stroke) **for sale**
86TRX250R (ESR310 72.5mm bore x 72mm stroke '298cc' fully modded) **SOLD**
88TRX250R (ESR330 77.5mm bore x 74mm stroker '345cc' fully modded)

HRC kit (all but gone)
Hot Cams stage III
Okie porting w/ATP CV4 springs (36mm Ti/31mm)
Venom/KBR N2O Porting w/KW springs (37mm/31mm)
Venom/KBR 487 100mm 14.25:1 piston
Cold Fusion Nitrous**
Venom 'QP' pipe
ESR Pro Series pipe
ESR modded intake w/RAT stack
42mm Taper-Bored FCR
Direct Drive clutch lockout, CR500 springs
GT Thunder-Link w/Durablue Lowering Link
Durablue Anti-Sway Bar
Modded shock mounts
Rage Modded Tranny

Jetting/Carb: #168, #45slow, NGPR needle 3rd clip, #55 Leakjet, Pilot 2 turns out.
Jetting/N2O: 22N/21F (22hp)

*STU Comp Cut 21x12x8 (6) paddle 'Padla Brats' on Douglas Blue label 8x8.....

Thanx to: Venom/KBR (Mixxer/Kam), Rage ATV (Dee), Sredum (Chris), and many ORG members
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Old 11-15-2005, 09:51 AM   #4 (permalink)
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I don't really know of anyone that's tried that. May be something to look into tho. Wish I could help you more on that.
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Old 11-15-2005, 12:19 PM   #5 (permalink)
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I get the correct plugs (IFR8L11) for mine at Advanced Auto or Auto Zone either one for $9 something apiece. They can get them overnite if they dont have them.
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'04 450R: LRD exhaust, HRC cam kit, Vortex ignition, CF Hood, Pro Taper bars, AC nerfs , Holeshot MX, Douglas/OMF beadlocks, Blingstar bumper and 5hp worth of stickers.
'88 250R: My new daily driver.
'88 250R: Totally restored money pit.
'86 350X: Creek machine
'85 200X: Motor locked up, had to take to get the 350X
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Old 11-15-2005, 12:52 PM   #6 (permalink)
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Hey Chris.. thanx for the advice...I didnt know the local auto parts stores sold bike plugs...ill hafta check them out....

now...for the good stuff.. how long ya been a #3 fan? I barely make time to watch NASCAR after he died....My entire office is covered in Earnhardt memorabilia....I just cant find another driver to get behind...and no...not a Junior fan....

Oh...one other thing... R U Guys running 8's instead of 7's because your racing?....I hate running a colder plug if I dont need to... have you had any 'fouling' problems running a colder plug?
__________________
**06 450ER**... #3 (Dale lives on)

86TRX250R (mostly stock 66mm bore x 72mm stroke) **for sale**
86TRX250R (ESR310 72.5mm bore x 72mm stroke '298cc' fully modded) **SOLD**
88TRX250R (ESR330 77.5mm bore x 74mm stroker '345cc' fully modded)

HRC kit (all but gone)
Hot Cams stage III
Okie porting w/ATP CV4 springs (36mm Ti/31mm)
Venom/KBR N2O Porting w/KW springs (37mm/31mm)
Venom/KBR 487 100mm 14.25:1 piston
Cold Fusion Nitrous**
Venom 'QP' pipe
ESR Pro Series pipe
ESR modded intake w/RAT stack
42mm Taper-Bored FCR
Direct Drive clutch lockout, CR500 springs
GT Thunder-Link w/Durablue Lowering Link
Durablue Anti-Sway Bar
Modded shock mounts
Rage Modded Tranny

Jetting/Carb: #168, #45slow, NGPR needle 3rd clip, #55 Leakjet, Pilot 2 turns out.
Jetting/N2O: 22N/21F (22hp)

*STU Comp Cut 21x12x8 (6) paddle 'Padla Brats' on Douglas Blue label 8x8.....

Thanx to: Venom/KBR (Mixxer/Kam), Rage ATV (Dee), Sredum (Chris), and many ORG members
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Old 11-15-2005, 02:17 PM   #7 (permalink)
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I've been a #3 fan since he was yellow and blue and wore Wranglers. I like Dale jr but **** the bad luck. I have always tried to make a 4-stroke run on the stock plug and 2-strokes on one size hotter. No real educated reason just my opinion.
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#3 Dale Earnhardt Forever !!!


'04 450R: LRD exhaust, HRC cam kit, Vortex ignition, CF Hood, Pro Taper bars, AC nerfs , Holeshot MX, Douglas/OMF beadlocks, Blingstar bumper and 5hp worth of stickers.
'88 250R: My new daily driver.
'88 250R: Totally restored money pit.
'86 350X: Creek machine
'85 200X: Motor locked up, had to take to get the 350X
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Old 11-15-2005, 03:08 PM   #8 (permalink)
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Quote:
Originally posted by 450RRR@Nov 15 2005, 12:52 PM
...
Oh...one other thing... R U Guys running 8's instead of 7's because your racing?....I hate running a colder plug if I dont need to... have you had any 'fouling' problems running a colder plug?
...
[snapback]159081[/snapback]
IFR7H11 Stock for the 2006 TRX450R
IFR8H11 Stock for the 2004-5 TRX450R - use for extended high speed high load or increased compression on the 2006 TRX450R
IFR9H11 Use for extended high speed high load or increased compression on the 2004-5 TRX450R

Do some searching on iridium sparkplugs, we discussed running other plugs in these engines in some detail a good while back...

~$9 at autoparts stores for the iridium NGK plugs does not seem so bad. It's a pretty nice plug.

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2004 TRX450R - Derisi Racing Suspension - 13.5:1 Wiseco piston, Keihin 40mm FCR carb, '06 airbox, ported head, HRC cam

1988 TRX250R - Wiseco Pro-lite 265, Keihin 38mm PWK carb.

2003 XR650R - Uncorked, street legal

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Old 11-16-2005, 08:58 PM   #9 (permalink)
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i was thinking a standard plug might technically have a slight performance advantave over the platinum plugs. i remember reading that a long time ago but i do not remember why. i do remember it being nothing that you would notice. i don't know much about the iridium besides they are much stronger and harder than even platinum. well i know they aren't cheap either...
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Old 11-16-2005, 09:57 PM   #10 (permalink)
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Hey guys...thanx for the input.... and actually...Iridium is a type of Platinum...apparently a harder/more expensive version..... go figure.. at any rate.....I believe the NGK BRK7E would be the closest replacement....I might try one and see how it works out... .thanx again...
__________________
**06 450ER**... #3 (Dale lives on)

86TRX250R (mostly stock 66mm bore x 72mm stroke) **for sale**
86TRX250R (ESR310 72.5mm bore x 72mm stroke '298cc' fully modded) **SOLD**
88TRX250R (ESR330 77.5mm bore x 74mm stroker '345cc' fully modded)

HRC kit (all but gone)
Hot Cams stage III
Okie porting w/ATP CV4 springs (36mm Ti/31mm)
Venom/KBR N2O Porting w/KW springs (37mm/31mm)
Venom/KBR 487 100mm 14.25:1 piston
Cold Fusion Nitrous**
Venom 'QP' pipe
ESR Pro Series pipe
ESR modded intake w/RAT stack
42mm Taper-Bored FCR
Direct Drive clutch lockout, CR500 springs
GT Thunder-Link w/Durablue Lowering Link
Durablue Anti-Sway Bar
Modded shock mounts
Rage Modded Tranny

Jetting/Carb: #168, #45slow, NGPR needle 3rd clip, #55 Leakjet, Pilot 2 turns out.
Jetting/N2O: 22N/21F (22hp)

*STU Comp Cut 21x12x8 (6) paddle 'Padla Brats' on Douglas Blue label 8x8.....

Thanx to: Venom/KBR (Mixxer/Kam), Rage ATV (Dee), Sredum (Chris), and many ORG members
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Old 11-17-2005, 11:25 AM   #11 (permalink)
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Some guys use the non-iridium plugs to get their jetting in the ballpark with a new combination. That way they have many fresh plugs for a cheap price.

Once my jetting is dialed in I put in the proper heat range iridium plug and forget it. I have not touched mine in months.

I'm sure the traditional plugs are fine for play riding. But, compared to the iridium plugs the traditional plugs of a particular heat range foul a bit easier and have poorer resistance to causing pre-ignition knock from overheated electrodes. The traditional plugs electrodes also wear away more quickly.

The projected tip, iridium plugs provide an excellent trade-off between knock resistance and startability. They also allow the flame kernel to grow rapidly away from the electrodes unlike the various multiple electrode plugs out there today(Splitfire and the like).

Some engine builders do index the plugs, but the difference with the TRX450R's pent roof combustion chamber shape should be small. But if every last HP matters go for it!

All that said I've had a bad iridium plug before. It was not visibly fouled but it produced no spark at all. I imagine it was cracked internally or had some other internal defect.

Just one other small thing...it's no big deal at all. But um, I'm not quite sure what you mean by "Iridium is a type of Platinum" they are both elements on the periodical table. They are 2 different types of metal. No worries. :)
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2004 TRX450R - Derisi Racing Suspension - 13.5:1 Wiseco piston, Keihin 40mm FCR carb, '06 airbox, ported head, HRC cam

1988 TRX250R - Wiseco Pro-lite 265, Keihin 38mm PWK carb.

2003 XR650R - Uncorked, street legal

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Old 11-17-2005, 12:10 PM   #12 (permalink)
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HP1...

Thanx for the input... to answer your question on Iridium......NGK calls their Iridium plugs....Iridium Platinum.... right off of their own product... apparently I was mistaken when I said Iridium is a type of platinum...I was going by what NGK labeled them...sorry...

And I would love to run the Iridium plugs all the time...but since I have one of those 06 450er's...which 'sometimes' does not like to Hot Start...I am looking for a cheaper alternative to replacing this plug....for some reason..and maybe you could help out....when the 06 dies instantly from 'blurping' the throttle....it wont start again.....(SOMETIMES).... and when this happens....if you check the plug....it wont fire.... but like you mentioned....it does not APPEAR to be fouled.... once you replace the plug...she fires right up.......and then...believe it or not... after riding a bit.. you can put the old plug back in that would not fire before...and it will work....WITHOUT cleaning it.... can you explain this phenomenon? Or should I just give up.....and live with it... others on here with the 06 are having a similar problem....I was merely going to try and change to a standard type of plug...or maybe an NGK V design like we used to race in the 90's....to help eliminate this 'fouling' issue...or whatever you want to call it.... If we could find a solution to this 'hot start' issue... i think many on here would be elated... thanx...
__________________
**06 450ER**... #3 (Dale lives on)

86TRX250R (mostly stock 66mm bore x 72mm stroke) **for sale**
86TRX250R (ESR310 72.5mm bore x 72mm stroke '298cc' fully modded) **SOLD**
88TRX250R (ESR330 77.5mm bore x 74mm stroker '345cc' fully modded)

HRC kit (all but gone)
Hot Cams stage III
Okie porting w/ATP CV4 springs (36mm Ti/31mm)
Venom/KBR N2O Porting w/KW springs (37mm/31mm)
Venom/KBR 487 100mm 14.25:1 piston
Cold Fusion Nitrous**
Venom 'QP' pipe
ESR Pro Series pipe
ESR modded intake w/RAT stack
42mm Taper-Bored FCR
Direct Drive clutch lockout, CR500 springs
GT Thunder-Link w/Durablue Lowering Link
Durablue Anti-Sway Bar
Modded shock mounts
Rage Modded Tranny

Jetting/Carb: #168, #45slow, NGPR needle 3rd clip, #55 Leakjet, Pilot 2 turns out.
Jetting/N2O: 22N/21F (22hp)

*STU Comp Cut 21x12x8 (6) paddle 'Padla Brats' on Douglas Blue label 8x8.....

Thanx to: Venom/KBR (Mixxer/Kam), Rage ATV (Dee), Sredum (Chris), and many ORG members
450RRR is offline   Reply With Quote
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