2007 450 grizz drive shaft came apart? - Yamaha Grizzly ATV Forum
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post #1 of 6 Old 04-19-2017, 02:22 PM Thread Starter
 
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2007 450 grizz drive shaft came apart?

This past weekend my son and I were riding. He was in front of me and at a very low speed his rear whells locked up. He put the 450 in reverse then drive and it freed up the wheels. Less then 100 yards at low speed the grizz lost drive. This is when I noticed the drive shaft had seperated. The machne never gave any indication there was a problem. Is this normal? Should I replace the shaft? Either way, is it possible to repair the shaft without any further disassembly?
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post #2 of 6 Old 04-19-2017, 02:33 PM
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Welcome to the forum!

Are you talking about the drive shaft or the CV?
All moving parts can wear out eventually and it is a 2007, so I would say it is "normal" depending on miles, maintenance, how it is stored, how it is ridden, etc.

Sometimes you can get new universal joints for cheap at an auto parts store if someone can tell you which ones fit. Might be able to bring it in with you and get them to match it up. Looks like Yamaha wants about $50 each for them. Replacing the whole assembly is going to be pretty spendy.

I replaced the U joints in the drive shaft of my RZR for $13 each with a set from an auto parts store.
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post #3 of 6 Old 04-19-2017, 06:45 PM
 
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The 2007 450 uses u-joints in the driveshaft, and that is what probably failed. It gave you warning, but most do not know to recognize it. Nor do most people inspect their bikes to catch these items wearing out (before they break).

If the yokes or the driveshaft itself are not damaged or bent, replace the U-joints and ride on.
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post #4 of 6 Old 04-19-2017, 06:49 PM
 
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Quote:
Originally Posted by dezz View Post
The 2007 450 uses u-joints in the driveshaft, and that is what probably failed. It gave you warning, but most do not know to recognize it. Nor do most people inspect their bikes to catch these items wearing out (before they break).

If the yokes or the driveshaft itself are not damaged or bent, replace the U-joints and ride on.
what are the signs of worn u joints?

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post #5 of 6 Old 04-19-2017, 10:46 PM
 
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Quote:
Originally Posted by alextm33 View Post
what are the signs of worn u joints?

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It depends on the bike and how worn they are. Generally worn u-joints will start out with a groan within the driveline. This can be accompanied by slight clunking noises. Because u-joints take time to wear out (rather than just break), the person using the bike thinks it normal driveline noises of gear lash because the mind is used to the noises, not realizing they are different. Like the noises you get when the engine brake grabs when in 2wd (almost like ratcheting noises).

Once a u-joint is worn enough to be loose, you'll get lots of clunking in the driveline, especially when going on and off the throttle. The groaning will get louder as well.

I wore out several u-joints on my old Polaris ATV's, and I could always tell when one started to wear. I had to replace one on the front driveshaft on my 1998 Grizzly 600. I could feel that one when it started to fail as well (and Yamaha is very proud of their U-joints. I couldn't believe the cost of it).

BUT even stating that, the best indicator of finding worn parts like this is inspection. Inspect your bike every so often. I am inspecting my wheel bearings, shafts, boots, bushings, ball joints, tie rod ends, etc.... all the time. Jacking the bike up and giving everything a quick look over and checking for loose/worn parts. It's a part of preventative maintenance.
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post #6 of 6 Old 04-19-2017, 11:07 PM
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I figured I'd give Dezz first crack at answering that one. I'll just add:

* Excessive drive line noise, if it gets worse fast enough that you notice that it's noisier than it used to be.
* "Chatter" on slow take-off, just a little rougher than it used to be.
* With wheels jacked up, rotate the wheels and watch the drive shaft to see how much slop is in it. Gotta start doing this early on so you have a frame of reference for later inspections.

2016 Grizzly 700 EPS SE Carbon Metallic
Iron Baltic skid plate kit
Warn 2500 winch
Heat Demon heated grips/thumb warmer.
Yamaha heated seat cover
Yahama rear box
Street legal kit
26" ITP Blackwater Evo Tires on SE wheels.

2015 Grizzly 700 EPS SE Silver
Iron Baltic Skid Plate Kit.
Warn 2500 winch
Heat Demon heated grips/thumb warmer.
Street legal kit
Wheels: Douglas Rattlesnake (machined outer)
Tires: 26x9x12 Sedona Rip Saw

2007 Grizzly 700 EPS (Deep Purplish Blue) [Sold]
2007 Grizzly 700 EPS (Special Edition Silver) [Sold]
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