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Discussion Starter · #1 ·
I recently got the bike from my brother in law, it has been sitting for about 4 years, but was running perfect when parked. I flushed the gas tank and fuel line and refilled it with 93 octane, checked the spark plug and it looks fine, changed the oil, and replaced the air filter. It starts and idles fine, but doesn't have half the power it should, and will randomly die or at least try to, it will only go about 47 in high. Clutches seem to be moving fine, but I haven't completely ruled it out. I've read all kinds of different things to check, but it would be awesome if someone could give me a general direction to start troubleshooting.
 

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Start by changing the spark plug, also might want to service the primary and secondary sheeves, check your charging system, the 07 and 08 grizzlies are notorious for burning up stators.
 

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Discussion Starter · #3 ·
Start by changing the spark plug, also might want to service the primary and secondary sheeves, check your charging system, the 07 and 08 grizzlies are notorious for burning up stators.
I plan on changing the plug, but it didn't look bad, and had a strong spark. I haven't checked voltage with a meter, but the battery is staying charged, so I don't think that's an issue. I'm going to clean and grease the clutch weights soon, but it doesn't seem to be the problem either. I was riding around the yard and it seemed to have a couple of short spurts where it wanted to wake up, even got a small wheelie once, but then tried to die shortly after. It seems like a fuel problem, but I can't say for sure.
 

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I've seen people have god luck with Sea Foam you might try that if you have a gummed up injector or something it might clean it out.
 

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Discussion Starter · #6 ·
so you pulled the tank, removed the fuel pump, washed the tank out at the quarter car wash, noticed no junk on the fuel pump sock then reinstalled it ..etc etc..?
huh bra?
Removed the tank, drained and cleaned it (with gas, not water), no trash in it. It had about 2 gallons of old gas/fuel stabilizer in it, so everything looked pretty good in the tank.
 

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Start with a new spark plug.

If still having issues, I would suspect a dirty injector. But it's only a suspision at this point.
 

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i'd separate the 2 issues..(1) the engine runnability and (2) the top speed issue..

if it starts easily, idles ok and accelerates smoothly, then on your fuel injected bike, driving it regularly will more than likely clear any hesitation issues...try the seafoam ..some people swear by it

(2) First things first...wet clutch compatible oil??, not sure how familiar you are with this little detail? yes? this could cause clutch slip at speed..
if ok then, put the bike into diagnostics ( i think the 07's had it) and check throttle position numbers then adjust for max throttle opening..

sounds like you have already peeked, but double check the cvt operation, another possibility, the primary (front) sheave is not closing all the way, thus not max speed.. so perhaps a clean and repack of the sheave weights would be in order, but confirm it first ...and snag a Factory service manual for all the details.
then be careful at 62 mph on concrete, tie rods ok???


 

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Discussion Starter · #11 ·
i'd separate the 2 issues..(1) the engine runnability and (2) the top speed issue..

if it starts easily, idles ok and accelerates smoothly, then on your fuel injected bike, driving it regularly will more than likely clear any hesitation issues...try the seafoam ..some people swear by it

(2) First things first...wet clutch compatible oil??, not sure how familiar you are with this little detail? yes? this could cause clutch slip at speed..
if ok then, put the bike into diagnostics ( i think the 07's had it) and check throttle position numbers then adjust for max throttle opening..

sounds like you have already peeked, but double check the cvt operation, another possibility, the primary (front) sheave is not closing all the way, thus not max speed.. so perhaps a clean and repack of the sheave weights would be in order, but confirm it first ...and snag a Factory service manual for all the details.
then be careful at 62 mph on concrete, tie rods ok???


Solid advice, thanks Walt. I used the same rotella t6 oil I run in my zx6r, never had a clutch issue, and it doesn't sound like it's slipping. I'm going to check the tps when I get home, that seems to be the issue. I noticed the fuel pump is pulling a vacuum on the tank after a while, so I'm going to replace the vent filter as well. As far as the clutch, I was told by the local Yamaha shop I absolutely need their $30 Yama lube grease for the clutch, because they've tried everything else, and it just doesn't work well. How true is that? I call bs, but figured it won't hurt to ask.
 

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yup T6 is the synthetic version of Rotella T, its JASO-MA ok..

the yamalube in a tub used to be called "grizzly grease" seems to work the best..its very thick and doesn't seems to thin nearly as much when hot so it doesn't spin out and make a giant mess inside the cover and all over the belt...spring for the $30..i think about my time to clean up the other stuff that doesn't work...just do it. You'll get about 5 changes per tub...

On a tip, read the book on the amount of grease to use..you lubricate 3 places, Sometime back, I actually weighed out the 90g for the weights on my wifes postal scale..its like about 3/8 thick layer around the sliders...thats all..

later
 

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Discussion Starter · #15 ·
any symptoms that are predictable and repeatable???
The only predictable/ repeatable symptom is it stalling or trying to stall after wide open throttle, and hesitating for a few seconds after restarting it. I put a fuel pressure gauge on it and rode it around my neighborhood for a good 30 min straight with a full tank of 93 octane and sea foam, fuel pressure never dropped below 46-47psi.
 

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My 2007 Grizzly 700 Ducks Edition had similar problems that appeared to be associated with the "boiling gas" condition. I bought it used and I don't know how long it sat nor did I have a fuel pump pressure gauge. I did everything from insulating the tank, changing the roll-over valve (ROV), replacing the ROV with an in-line fuel filter, changed spark plugs, etc. Mine would always run great on a full tank of fuel. Once I got to 30-40 miles and about 1/2 tank of gas, the stalling, gas boiling would start. If I filled the tank (being careful to vent all the gas tank pressure first), I would be good to go. Finally, upon the advice of my local Yamaha dealer, I replaced the fuel pump. With 200 new miles on the machine, I have not had the problem again. My thinking is that the fuel provided a "cooling medium" for the pump and when the tank got to 1/2 full, the pump got hot and did not perform like when "cooled" with a larger volume of fuel or when the fuel level was low and riding on rough surfaces, the fuel aerated and the pump was not strong enough to overcome that. That is my experience for what it is worth. Thanks for reading.
 
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