Just got a new grizz today, tried out brakes and hear the rear caliper chattering horibly! Does this just need broke in? Is this common on a grizz? Somebody please help![img]i/expressions/face-icon-small-frown.gif[/img]

 

It is the braking system that makes that noise. It is harmless and nothing is wrong. I asked the same thing when I got mine too. Also it seems to do it more in 2wd than in 4wd.

 

Thanks alot overated, I actually found an old post just now saying the same thing, it sure is annoying though. Hopefully it gets a little quieter over time. I also read alot of posts talking about improper float adjustment from factory, do you know if this problem was on earlier years or is the 05 included? ( the posts did not specify the year)[img]i/expressions/face-icon-small-confused.gif[/img]:

 

There were a couple of problems with the carbs and vapor lock in the fuel lines, but from what I can find these problems were fixed with the newer models. Mine is 05' and I have had no problems with anything. The Grizzlys are cold natured, mine is even more so than my Raptor, so choke it and let it warm up good. Also, this is a must if your going to be riding in water, put some dielectric grease in your spark plug boot and the two connectors on your front diff. The dielectric grease will stop all the spuddering problems you might hear about.

You won't even notice the rear brake sound after a few rides.

 

Congratulations on your new machine!

My ’02 has never had water issues (so far) in normal trail and mudhole situations. I’ve never had a carburetor or float issue yet either. As for vapor lock, I’ve been into a situation a few times after doing a lot of slow speed work for an extended period of time (such as pulling a mower for hours), after which when I try to speed up it sputtered and coughed. When in this situation I noticed that the fuel in the tank was boiling. Stopping the engine and letting it cool down for a short time resolved the issue. However for normal trail riding this was never a problem. This issue was addressed in a recall for '02 and '03 models. The recall solution was to retrofit side panels and heat shielding that was applied to the '04 model year and beyond.

I have also read that vapor lock can be caused by a sticky check valve (ball) in the gas cap. It is there to prevent spillage of fuel from the gas cap vent if the machine is tipped over. Some have solved this problem by removing this check valve. I do not know if this check valve thing applies to all 660s or only to certain model years.

I’ve always had the rear brake chatter though (I believe it is common to all Grizzlies), and it seems to be more noticeable when applying a lot of brake pressure while going downhill...

 

Thanks guys, your a big help. I now have 2 hours on it. This thing is SWEET!

 

Yes, 05 included. Use a piece of clear plastic hose. Put it on in place of the carb drain hose. About a foot long is plenty. This float check will save you from removing the carb to check the float height. Put the hose on the drain nipple of the carb. Bend it up a like a letter "u". With the fuel valve shut off, crack open the carbs drain screw and watch the fuel go into the clear hose u just stuck onto the drain nipple. The fuel will travel down the hose, around the "u" bend and up the other "loose end you are holding" side until it reaches the fuel level inside the carb. Sould be close to the fuel bowl gasket. Check your spark plug to, if is always black that is an indicator of a needed adjustment.

 

the chatter is normal because the fact that it is mounted on the rear driveshaft and the rear brakes take up any slack and play in the rear driveshaft...it helps stabilize the driveshaft too...i hardly use my brakes though because my Grizz has a good engine braking system...

 

If the fuel valve is off, wont this measurement be a bit lower than is normally in the carb? The volume of gas in the tube, is subtracting the amount of volume in the float bowl, and with the valve off...it wont refill to the correct level. Its probably a minor amount, but i was just wondering if I was doing it wrong by haveing the gas on?

 

yamaha does not adjust the floats on the grizzly's, lol. i dont understand why, but they dont. so, yours is fine, until it tells you otherwise. if your climbing a steep incline, up a hill, or out of a mud hole, and it wants to die out, your float needs adjusting. that is how you'll know, from pulling out of a steep incline. the grizzly comes rich from the factory, if at sea level. so, check your plug, and see if its all black. if so, do your 20 hour maintance, including the valve adjustment, and slap in a k&n to lean her out a little. or you can drill out the baffles in the exhast, and add a 1 1/2 inch tip. that gets her to a good mixture. if you do both, you'll have to rejet though.
adjust the valves every 25 to 30 hours until you hit 1000 miles on her. the 3 intake tighten up quick, and it is really needed! if you dont, your wearing out the engine way too quick. and it wont run as good.
the dialetic grease is a must for the grizzly, as stated above.

get her all broke in nicly, and do the maintance. then you can begin to feel what the grizzly offers. after a few hundred miles, maybe a snorkle system, or more power for her, heehee. you might be surprised at how much more you can squeeze out of the quad with some money, and some machanical skills.

good luck, and congratz on the new quad!!!