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Only $10 for all 2024 SX, MX, and SMX series (regularly $30).
1st of all it's a 450 plain and simple. He has one bike and bought it brand new, hour meter installed when he got the bike. He has the maintenance done hourly, I was at the track both days while it came apart. 1st time may have been loose bolts and he got a decent amount of ride time out of it and checked up with the bolts, they did have loctite and torqued down. It was either a bolt or sprocket problem. 2nd time was all new boots suggested by RMATVMC, along with the sprocket and everything else. Bike only had been ridden 5 times or so with all the new stuff and it came apart again. Bike has about 70 hours if I remember right. Call it what you want, when you see the bike in person it is far from beat. Everyone on here thinks they are a master mechanics and everyone else is idiots. He has no reason to lie about anything.
I will say though, the first time it happened it could have definitely been because the bolts walked or loosened. The second time absolutely not because of the bolts being loose. They were checked before the ride it happened on. Much appreciative to those who gave ideas or thoughts.
I sure wish I did have a 250 still to go with my 450.
The Shop
A couple of years ago, I owned a YZ450 with STOCK hubs. I ran a sprocket similar in design to that where it only made contact with the hub at the bolt points. NOT ALL THE WAY AROUND the circumference of the hub. I constantly had sprocket bolts coming loose no matter how tight I tightened them. It finally took out my rear hub one day in a long moto just like yours did. I bought a new hub, and switched to a normal design rear sprocket and have never had a problem since. Just thought i'd share that.
4 pages.
Awesome!!
dude getting all bent out of shape because he doesn't know how to bolt a sprocket to a hub should lay off kettle-balls for at least a couple weeks
Just thought I'd point his out.......Fully aware this is NOT a TUSK hub, but interesting concept design with regards to hub and sprocket contact area.
This photo is from the CR 250 Full Tilt Build, Interesting that this sprocket is designed much like the sprocket in question on the RMZ. Fully aware that were talking about completely different bikes with regards to weight, torque and horsepower.
It also appears that the hub is also machined so that there is no contact area between the sprocket bolts, or very limited contact in a full circumference on the sprocket.
.
Pit Row
Blown hub due to loose bolts caused by a horrible sprocket design from Vortex.
Lessons learned? Don't buy sprockets with this design failure (and check your bolts regularly)
The end
http://motocrossactionmag.com/news/ask-the-mxperts-why-do-my-yamaha-hub…
newmann wrote:
Careful with the choice of loctite. They do have one that handles vibration but removes with little heat. I think the red releases at around 360 degrees, might want to google it. I always put some red loctite around the tapered head of the bolt where it seats into the sprocket instead of the threads. Torque them properly and never had one come loose.
Same Sprocket design
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