This is a discussion on Spark plug change. How often? within the Grizzly Talk forums, part of the Grizzly Forums category; For the 700 guys. How often are you needing to change spark plugs?
For me it seems to be every 400 miles or so. I ...
These 09s and up have different plugs than the earlier models and they EAT them fast. I'm not the kind of guy who waits around for poor performance to happen. 250 miles and the plug gets thrown away and a new one put in. I change the oil-oil filter-plug and clean the airfilter OFTEN- that's the way I like to roll. If I wanted to putt putt around not changing anything I would own a honda.
08 700 3300 mi. Have changed the plug one time after fouling on a cold start up in 30* temps at about 1500 mi. Other than that one time it has always started and run great.
09 550 2400 mi. Have never changed the plug. Starts and runs great.
IMO, the key to long plug life is to warm up the engine before giving any heavy throttle and to make sure and have some run time at high RPMS to keep the plug cleaned off. In other words, don't just "putt" around and then shut the motor off especially on a cold engine!!!
Those that have fuel controllers make sure you don't run too rich!!!!!
I do carry spare plugs on the bikes because you never know!!
08 Camo 700EPS, 26" BH OGs on Blk 108's, 1" frnt whl spcrs, Elka Stg 2, RDC 2" lift , Rhino axels, EHS Bullet Box & lid mod w/K&N, Dyna FS, HMF Swamp Exh, Coop45 sheave, greaseless wts, purple spring, Yami US HD frt bumper, Bison Hunter rear bumper, ViperMax 3500 w/syn line, ATVrocks skids & Rock Sliders, Rox risers & Solex tapered quad bars, Roto Pax, PIAA Intense White H4's, Plano 1510 rear box.
I change my plug often. In my case, that's about every 20 hours. It gets harder to start and I know I need to service the filter and change the plug. Not that it won't run much, much longer on a plug, but I can tell it gets a little finickey when starting and playing in the deep water.
These things go through plugs for some reason.
I don't putt-putt around too much, but I don't get many long, high speed runs either. In my case, I'm sure running them in the mud and them slamming them into the rivers and creeks creates temperature spikes and shortens the life of the plug.
Because people don't post up saying a hotter plug fixes the plug problem on these 09s and up. I always warm my engine up good when I get ready to ride. I never putt around much either, I work that engine alot. Sticking a new plug in there frequently doesn't bother me at all. I could care less. The plug isn't on my list of things to worry about. I know what to do, take them out frequently and throw them away. This isn't what everybody should do, do what ya want with yours
No I'm not saying you I'm just saying in general. I put a hotter plug in mine when I did all my mods and I've never had to change mine and it still looks good. Now,before I was running rich that's why I tried a hotter plug.
Louisiana mud boggers member #2
"YACC" member #1
Owner of Axle Customs ATV
2004 720 grizz with alot of other shit!
I agree with most of whats been said, it all adds up to your riding style, mods, conditions of your quad and the terrain you ride in and what works for you. Like mentioned carry spares because nobody knows when ones gonna go south on you and you know your riding partners most of the time don't have a spare plug!
Hell it aint rocket science it's common sense!
__________________ 07 CAMO700 FI EPS Viper Elite 3500 STOLEN
2"Hitch K/n Air Filter EHS Lid Yamaha HD D2 Overfenders RicochetSkids COOP2&3
HMFSwamp&Optimizer Dyna FS Rigid 4" Dually LED Tigertail System Yamaha Box
Amen. The 09's Eat them. Every 10 - 20 hours, I'll pull it out and check it. I went through 2 in 09, and just changed mine while doing fluid change last week. Start's like crap, idles like crap, time to change plug. I always keep a spare.
09 700 EPS Hunter
Full Muzzy Exhuast
Dyna FS Ignition
Coop mods 2 and 3
Faast Flexx bars
ROX 3.5" Risers
26" Zillas on 14" MSA M12 GREEN Diesels
26" Swamp Lites on stockers for the salt
PIAA 510 SMR's
"Never let a Polaris go first"
Last edited by NeoNate77; 01-13-2011 at 06:03 PM..
I have 8500 miles on my Grizz now and am on the second plug. The first plug was changed at around 3500 miles and looked good and no issues. Runs and idles fine and gets excellent fuel mileage. I will be changing it at the next service, but just for peace of mind, not because it is worn out.
08 Grizz 700EPS,DynaFS,Uni-air
ODI Rouge grips, 25" ITP Baja crosses
Tamarack quad box,
Mad Dog bags,Pioneer Jr fuel packs. Garmin 276C GPS...
The Following 2 Users Say Thank You to DRKnight5515 For This Useful Post:
It seems the more engine mods, the more you monkey with it. Its makes sense, your getting more out of the motor, so maybe it burns plug faster.
I'm at 1000 miles on mine, 70 hours, and always let it warm up while I gear up. Runs like a top. I don't plan on changing it until it runs bad. Even on the trail if it took a crap, I'd hope to be able to clean it enough to get me to my truck. Plugs, in my experience are not on / off, they run like crap and enough to get you home.
I follow my manual for all service. I'm not a mudder, and lucky to get water over the wheels every 100 miles I've gone.
Now if I lived were a real griz could tear me apart while walking back ( i've had to walk back in CO), I'd carry an extra and sidearm.
- Marks 550 FI Green at 3550 miles Mods: recovery gear, Viper 2500, Fatmax, ingenuity, custom shift knob, Coors light, Kolpin gun setup, Moose Utility Handguards, K&N filter, Bighorn OG's 25''
GrizzlyCentral.com is not associated with Yamaha in any way. We are an enthusiast site dedicated to the Yamaha Grizzly ATV. Our goal is to offer a place for Grizzly owners to discuss rides, events, mods, maintenance, purchasing, etc and offer help and assistance.Contact Us -
Yamaha Grizzly ATV Forum -
Privacy Statement -