Locked700 Grizz spark plug

Post
dc9pilot
Puddle Jumper
2006/10/17 01:59:16
The owners manual has the replacement plug listed as a NGK7re and the maintinance manual says the NGK8re. My dealer sold me the 8re and when I replaced it the 7re was in the bike. I put the 8re in, can this hurt the engine? I will cal Yamaha and try to find something out.
matt660
Mud Pro
RE: 700 Grizz spark plug 2006/10/17 04:23:49
Contact Yamaha.  Using the incorrect spark plug can cause major engine damage.  Be careful!!
goldmember
Mud Monster
RE: 700 Grizz spark plug 2006/10/17 05:20:34
Interesting, my manual calls for R7EA-9
dc9pilot
Puddle Jumper
RE: 700 Grizz spark plug 2006/10/17 12:41:33
I talked to Yamaha and they said both their manuals show the R8EA even though mine had the R7EA-9 in it. He said the 8EA was a hotter plug and it will not be a problem to use it. I will probably put a new 7 in just to be safe.
loudelectronics
Super Swamper
RE: 700 Grizz spark plug 2006/10/17 17:25:33
That is wierd.  why would they put a 7 in and then sell you an 8?
CrazyJas
Trail Rider
RE: 700 Grizz spark plug 2006/10/17 19:42:07
My dealer told me today that that there is an issue about the spark plugs for Grizzly 700s as per a Yamaha dealer bulletin.
 
He said and I quote "the is a specific NGK spark plug required for the Grizz - only availabe through Yamaha (which is unavailable) and that NGK is clueless about the issue." 
 
That is what the dealer said when I went there to show them that my Yamaha brush guard will not allow my Warn/Yamaha 2.5 winch to fit in the mounting holes......aaarrggghhhh!!!!
bcbud
Mud Maniac
RE: 700 Grizz spark plug 2006/10/17 20:58:38
What i was told.......That along with the shifter update there was a sparkplug update to correct a plug fouling problem.This was the only problems my local dealer had with there demo 700.
 
This tells me that the plug that was in your machine should be the "upgraded version".

post edited by bcbud - 2006/10/17 20:59:56
probus
Outlaw Extremist
RE: 700 Grizz spark plug 2006/10/17 21:01:52
so how hard are they to change anyway??
loudelectronics
Super Swamper
RE: 700 Grizz spark plug 2006/10/17 21:37:41
Any one fouled any plugs yet?  I have not in the 500 miles I got.  I have the 7 in right now.  Every other yamaha I own always used 8's.  The 700 runs pretty lean so by going to a hotter plug kinda scares me a bit with out fuel addition.
HMF
Trail Rider
RE: 700 Grizz spark plug 2006/10/18 09:13:53
I would also look at the spark plug ground strap for a determination.
 
Heat Range = Ground Strap, the ground strap indicates the heat-range of the spark plug. If the "color" of the ground strap "changes" too close to the ground strap's end, (which is above the center electrode), then the heat-range is "too cold", meaning that the strap is loosing heat too quickly to the base ring, and is not able to burn off deposits until near its end.
 
If the "color" of the strap changes near where it is welded/attached to the base ring (last thread ring), then it means that the plug heat-range is "too hot", because heat is not being transferred/cooled from the strap to the base ring quickly enough !!!! The strap might begin to act like a "glow-plug", eventually causing preignition and/or detonation later on.
Proper heat-range is when the "color" is at the halfway point on the strap, neither too cold or too hot.
supergrizz05
Mud Master
RE: 700 Grizz spark plug 2006/10/18 09:49:24
the dr8 plug is the same one thats in nearly every atv since back in the three wheeler days. its just a tad hotter than the 7 but it shouldnt hurt anything imo
dc9pilot
Puddle Jumper
RE: 700 Grizz spark plug 2006/10/18 17:35:25
I just got a call from Yamaha today and they told me the correct plug for our 700 is the NGK R7EA-9 that there is a misprint in the maintnence manual and that it is on back order. I am very impressed with the customer service so far, Yamaha called me back on thier own to correct what he told me yesterday.
drpep
Trail Rider
RE: 700 Grizz spark plug 2006/10/18 17:38:42
Good information dc9pilot as my shop manual is wrong also.
bcbud
Mud Maniac
RE: 700 Grizz spark plug 2006/10/18 17:48:03
Thats good of the Yamaha employee.
 
When i first heard of the emission problem.I checked the tail pipes on the two local dealers 700's and they were full of black carbon(soot).I do random check on my 700 and it's never black like those first production demo's were.
probus
Outlaw Extremist
RE: 700 Grizz spark plug 2006/10/18 20:01:04
the demos were probly black from idleing around and never really being opened up.
bcbud
Mud Maniac
RE: 700 Grizz spark plug 2006/10/18 23:21:43
Good point,
 
The one guy told me about riding it at a moto-x track,a bunch of 700's & 660's.It was a Yamaha organized ride for staff to understand the differences etc.This was before the upgrades,fouled plugs and steering issues on the 700's.It was these types of ride reports back to Yamaha that promted the reto fits.
 
Definately reliable info from a Yamaha guy.Now that the upgrades are installed on the demo,no problems reported.