Bottom chaincase bolt (again)

[mytro]

According to BCBOOST the spacer cures the problem. Its not that the spacer keeps the bolt from bottoming out in the driveshaft, rather that without the spacer the collar bore does not meet the end of the driveshaft. Its shy by about 5mm and thus the collar presses against the part Yamaha calls a "journal". Just installed spacer on a friends sled. It hasn't been ridden so time will tell. As far as mine....I don't have reverse.

Old bolt p/n 90105-10320-00
New bolt p/n 90105-10368-00

I'm sure there was another post on this? Can someone confirm my thinking on this before I put it back together. The "collar" does not meet the drive shaft this we know, so the bolt will have a "stretch" factor on it when we tighten it, then any run out from drive shaft, collar and bearing will be directed to that "weak" area of bolt causing it to break. If the drive shaft were the right length ( longer) the collar would bottom out and the breakage would not occur.
So the washer are making up this space..

Would the new bolt not break as well without washers? ( spacers)?

 

[BoonDock Saint]

FYI p/n has changed again to 90105-10369-00 checked on portyamaha

 

[HRD2PLZ]

FYI p/n has changed again to 90105-10369-00 checked on portyamaha

Mine broke, runnin without it now.

 

[mytro]

FYI p/n has changed again to 90105-10369-00 checked on portyamaha

Mine broke, runnin without it now.

Leaning towards running it without bolt, I don't see any wear on the collar where it was running on it's own. The bolt head did do some damage to the cover, I'd love to have more feedback..

Thanks

 

[sgilbert]

I am 100% confident on the spacer fix. wouldn't run without the bolt

 

[walty]

all i got "on hand" is a regular 8.8 grade bolt and washer....should i wait 2days for the oem bolt or can i use this one???

IF i use the 8.8 bolt i would use it with out the washer...i am afraid the washer will move aroung IF the bolt manage to break again!!!
fx.nytro 2008 10000km original bolt
my was broken when i check!!!

 

[mytro]

all i got "on hand" is a regular 8.8 grade bolt and washer....should i wait 2days for the oem bolt or can i use this one???

IF i use the 8.8 bolt i would use it with out the washer...i am afraid the washer will move aroung IF the bolt manage to break again!!!
fx.nytro 2008 10000km original bolt
my was broken when i check!!!

Mine just went back together without any bolt, 75% of the Nytro's out there are running around with broken bolts in them, mine just won't have the hardware bouncing around. There is a reason these bolts are fatiguing and it's more than just the gap between the drive shaft and collar..

 

[canoehead]

800km's on $25.00 spacer fix and all is goood!

 

[upei93]

TTT...some good info for the new round of broken bolts.

 

[Mountaintech]

800km's on $25.00 spacer fix and all is goood!

X2. The only way to fix it properly without buying the updated longer axle etc.. A different bolt is not the fix once you understand what's wrong.

 

[upei93]

800km's on $25.00 spacer fix and all is goood!

X2. The only way to fix it properly without buying the updated longer axle etc.. A different bolt is not the fix once you understand what's wrong.

What type of metal are you guys using for your spacers??

 

[Nine2Nine]

800km's on $25.00 spacer fix and all is goood!

X2. The only way to fix it properly without buying the updated longer axle etc.. A different bolt is not the fix once you understand what's wrong.

Unless it is a rubber bolt!!!

 

[canoehead]

800km's on $25.00 spacer fix and all is goood!

X2. The only way to fix it properly without buying the updated longer axle etc.. A different bolt is not the fix once you understand what's wrong.

What type of metal are you guys using for your spacers??

Steel