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fouled a CR10ek

Blue Oval

Blue Oval

Expert
Joined
Feb 22, 2006
Messages
281
Location
Westminster, Ma
Website
snyderpools.com
Just got back from Maine yesterday, (The Forks). After roughly 80 miles on Saturday I felt the machine lose quite a bit of power down low and the exhaust was sounding louder, it felt like it was running down one less plug. The trail conditions were getting worse as the temps climbed into the 30's and the 50 or so "family" or tours groups doing 5 mph I'm sure contributed to this! I stupidly forgot to bring my original stock plugs and on sunday I drove the 30 miles by truck up to Jackman to pick up a new set of stockers, it was snowing up there and they wouldn't let me pull my sled under cover to change the plugs, so I drove back to our cabin south and proceeded to create a yard sale and change the plugs myself. I also forgot my manual so with a heads up from My Outdoors, who was in Nash Stream I got to work, All told it took me about 50 minutes to completely do the swap. Make sure you have a 10mm socket with a long extension for the cap bolts and an allen wrench would be smart too as I don't think the tool kit has either. I also used a 9/16 socket on top of the plug tool too. I guess I kind of did it trailside but wouldn't want to make a habit of it, besides the ball busting from the AC guys wouldn't stop :o| Sorry I made this so long but I wanted to tell my story :yam: By the way I can't say I feel ANY difference between the plugs. All my buddies who rode my RTX also loved it and couldn't feel the weight difference at all, though my Mach Z bud did tip mine over once but no damage. I will be ordering the 13mm this week!
 

The Cat guys can do all the ball busting they want. My stocker GT got around a modded F1000 on one race (2400 feet or so) in good hookup conditions, and he finger walked me by 2 sled lengths on glare ice on 3 races back to back (not anough hookup). BTW a well breathed on F7 was way behind on all races. Not bad for a four stroke.
 
Stop babying that thing Doug and "ride her like ya stole t"! Are you up for a ride in Fitzwilliam this week?
 
I've wondered if the 4-strokes run better by riding it like a 2-stroke, and revving it while ditch riding, or if you shoud try to keep the throttle smooth without the little revs all day long. I have the CR10's, and haven't noticed and problems, but I only have about 250 miles on them.
I've always thought that the short revs wold keep the belt from burning as fast, but I don't know....
How does everybody else ride??? You would think a 4 stroke would not foul plugs unless there is a fuel delivery problem, and that low rpms for a long time wouldn't affect it. Anybody????
Nate
:4STroke:
 
Being a colder range plug this doesn't surprise me. I fouled the production plugs during a cold start attempt @ -20*F. This also surprised me as I thought a 4 cycle would be less susceptible to fouling.
 
plugs

Blue,
I've been waiting for a post like yours. A colder plug will foul easier than a hot plug. You shouldn't have to change your riding style to keep them from fouling. Go with the plug that Yamaha says to use.

As for the claim that you will get 2-3 HP more. BS, and it makes me laugh when people say they can feel the difference. I wrote to Dear Ralph from Snow Tech, and he said the Yamaha engineers laughed when he asked about the plug change, and the claims made. Even if you did get 2 HP more, is it worth it to use a plug that is not endorsed by Yamaha?
 
1500 miles on my cr10ek's with no issues. I do agree though, I would be real suprised if they made any more HP. Kind of like the ram air lid that I made that show NO performance gain in side by side testing.
 
Sorry apex yooper, It is worth 2-3 HP. You can feel the difference if you have the cr10ek in, stop on the trail and swap them out for the stock plugs. You WILL be putting the cr10ek back in at the next pit stop! You won't notice 2-3 HP from one day to the next. Hell you wont notice 5 HP one day to the next. They work so well, I change them out before putting one mile on any new sled I get. I have never fouled one. All plugs stock or otherwise, will foul if you don't run the machine long enough to warm it to operating temp and beyond.
 
Plugs

I put them in my sled back in the fall. I run it in and out of my shop during the day. I fouled a couple before I changed them out. They mihgt have been ok if I would have changed them and rode it.
Bruce
 
Maybe they will give you more HP but if you go with a colder plug you better be on the gas and not putting around. Racers would go with colder plugs because they were going full throttle all the time. You won't foul a plug going full throttle but if you slow trail ride then your better off with a hot plug. I guess you have to decide if the 2 HP is worth the risk of spending an hour changing your plugs on the trail in bitter cold temps. I personally don't give a rats #*$&@ about 2 hp and I don't want to be changing plugs on the trail when I can just keep riding with 2 less HP.
 
It is very important to let the sled warm up fully! No matter what spark plugs you are running! If you're just running the sled outside from the garage at least let it sit and idle even for 5-6 minutes to get up to temp. Condensation from not being fully warmed up will kill alot more than just spark plugs!
 
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