I sheared more sprocket bolts...

mq1991 · 07-15-2016, 11:16 AM

So I replaced the stock sprocket bolts with Honda ones, hoping I wouldnt have to worry about the little buggers anymore.

Now, instead of the stud shearing off into the hub, the nuts are popping the threads off just above the sprocket. I cant seem to find out how its doing this.

I installed the posts with locknuts, it doesnt seem like they loosened, just popped the threads right off of there.

Any suggestions for some other sprocket studs? Not sure what to try next...

Thanks guys.

2LZ · 07-15-2016, 11:43 AM

That's really strange. You running nitrous? ;-)
One would think that with the c-clip plus nuts, it would stay put.
What torque spec did you use?

Azhule · 07-15-2016, 11:50 AM

Quote:

Originally Posted by 2LZ

What torque spec did you use?

That's my question too... How many ft lbs did you do?

mq1991 · 07-15-2016, 11:53 AM

Quote:

Originally Posted by 2LZ

That's really strange. You running nitrous? ;-)
One would think that with the c-clip plus nuts, it would stay put.
What torque spec did you use?

Nah I think its just the raw power of the hawks engine.

Its very odd, because the way it broke the sprocket is still driven. The threads still protrude into the sprocket.

I did 20ft-lbs. I checked them after 20 miles and 100 miles and they were still snug. Now about ~800 miles later that's how they sit. Only one locknut still on.

I ordered some of the "high tensile strength" ones for taobao, I guess we will see how those work. These stupid things are hard to find at a reasonable price.

Weldangrind · 07-15-2016, 12:04 PM

You're going to need to re-jet to take away some power.

I suspect that 20 ft/lbs is a little high. Assuming it's around 5/16" and about Grade 5, the spec would be closer to 13.

Weldangrind · 07-15-2016, 12:06 PM

Did you change the bushings as well? Perhaps Honda bushings would be a good plan.
Also, red Loctite might be better than high torque on the fasteners.

mq1991 · 07-15-2016, 12:07 PM

Quote:

Originally Posted by Weldangrind

You're going to need to re-jet to take away some power.

I suspect that 20 ft/lbs is a little high. Assuming it's around 5/16" and about Grade 5, the spec would be closer to 13.

Dang... I figured it was close to the fork clamp bolts.

Another thing I noticed when installing these studs is that they were smaller than the originals. You can see in the picture the larger hole where the original size wouldve fit. The sprocket has two sets of holes, so if I can find the correct size hopefully it'll stay together.

Azhule · 07-15-2016, 12:09 PM

Maybe go to the lower end of the "Sprocket Torque Specs", 18 - 28 Nm (13 - 20 ft lbs)

Might try going with 13 - 15 ft lbs of torque to hold those bad boys in place without breaking them

mq1991 · 07-15-2016, 12:09 PM

Quote:

Originally Posted by Weldangrind

Did you change the bushings as well? Perhaps Honda bushings would be a good plan.
Also, red Loctite might be better than high torque on the fasteners.

No, the bushings still seemed to be in good shape. It was a very snug fit fitting the posts into them. (How do you get the bushings out?)

Ill do that next time, im planning on locknut with lock washer with red loctite.

@ 13-15 ft lbs. lol

2LZ · 07-15-2016, 12:17 PM

This is all good to know since I ordered a new sprocket this morning! :-)

mq1991 · 07-15-2016, 01:00 PM

Quote:

Originally Posted by 2LZ

This is all good to know since I ordered a new sprocket this morning! :-)

Hope yours stays put!

I also dont ride my bike very nice. I wheelie it alot, jump it higher than its supposed to, hit the rev limiter every once in awhile, hard(fast) trail riding, etc.

Im happy for the most part with how its held up. The fuel tank still has me ticked though.

Ariel Red Hunter · 07-15-2016, 01:29 PM

Quote:

Originally Posted by mq1991

So I replaced the stock sprocket bolts with Honda ones, hoping I wouldnt have to worry about the little buggers anymore.

Now, instead of the stud shearing off into the hub, the nuts are popping the threads off just above the sprocket. I cant seem to find out how its doing this.

I installed the posts with locknuts, it doesnt seem like they loosened, just popped the threads right off of there.

Any suggestions for some other sprocket studs? Not sure what to try next...

Thanks guys.

Looking at your picture, it appears that the sprocket is bearing on the threaded end of the studs. If that is so, I'm not surprised they sheared off. The load must always bear on the unthreaded part of the studs. Find longer shanked studs, even if you have to use washers to get the nut tight.

mq1991 · 07-15-2016, 01:41 PM

Quote:

Originally Posted by Ariel Red Hunter

Looking at your picture, it appears that the sprocket is bearing on the threaded end of the studs. If that is so, I'm not surprised they sheared off. The load must always bear on the unthreaded part of the studs. Find longer shanked studs, even if you have to use washers to get the nut tight.

Its very odd though, if you refer back to my previous pictures, my stock ones broke on the smooth stud side. The threads are fine, but I know what your saying.

http://www.chinariders.net/showthread.php?t=16797

It seems to be a specialty part... is there a common replacement?

Ariel Red Hunter · 07-15-2016, 02:22 PM

Quote:

Originally Posted by mq1991

Its very odd though, if you refer back to my previous pictures, my stock ones broke on the smooth stud side. The threads are fine, but I know what your saying.

http://www.chinariders.net/showthread.php?t=16797

It seems to be a specialty part... is there a common replacement?

Did you notice the nuts for those studs? They are shouldered. I find it hard to believe that the English AND the Indians have better steel than the Chinese. I never have heard of an English bike using the "Enfield Cush Hub" breaking studs. And the Royal Enfields made in India don't seem to have this problem either.

bogieboy · 07-15-2016, 09:20 PM

Quote:

Originally Posted by mq1991

Hope yours stays put!

I also dont ride my bike very nice. I wheelie it alot, jump it higher than its supposed to, hit the rev limiter every once in awhile, hard(fast) trail riding, etc.

Im happy for the most part with how its held up. The fuel tank still has me ticked though.

my 2 cents... this is why they are shearing....wheelies... I sheared 3 sets of those wheelieing.... I endes up supermoro conveeting with ninja 250 wheels and a cush hub that doesn't use stipud little pins.... I forget where I got em but I found some hardesned larger diameter pins somewhere... fit the big holes in the sprocket... didn't have issues with that....

07-15-2016, 11:16 AM	#1
mq1991 Join Date: Mar 2016 Location: Gurnee, Illinois Posts: 277	I sheared more sprocket bolts... So I replaced the stock sprocket bolts with Honda ones, hoping I wouldnt have to worry about the little buggers anymore. Now, instead of the stud shearing off into the hub, the nuts are popping the threads off just above the sprocket. I cant seem to find out how its doing this. I installed the posts with locknuts, it doesnt seem like they loosened, just popped the threads right off of there. Any suggestions for some other sprocket studs? Not sure what to try next... Thanks guys.
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07-15-2016, 11:43 AM	#2
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,079	That's really strange. You running nitrous? ;-) One would think that with the c-clip plus nuts, it would stay put. What torque spec did you use? __________________ "Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350
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07-15-2016, 12:04 PM	#5
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	You're going to need to re-jet to take away some power. I suspect that 20 ft/lbs is a little high. Assuming it's around 5/16" and about Grade 5, the spec would be closer to 13. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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07-15-2016, 12:06 PM	#6
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Did you change the bushings as well? Perhaps Honda bushings would be a good plan. Also, red Loctite might be better than high torque on the fasteners. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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07-15-2016, 12:09 PM	#8
Azhule Join Date: Dec 2015 Location: CO Posts: 1,525	Maybe go to the lower end of the "Sprocket Torque Specs", 18 - 28 Nm (13 - 20 ft lbs) Might try going with 13 - 15 ft lbs of torque to hold those bad boys in place without breaking them __________________ "Think as you like... but this self proclaimed Professor is always right" - Buckshot "You never know what someone is hiding beneath their smile..." - NinjaTom - R.I.P.
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07-15-2016, 12:17 PM	#10
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,079	This is all good to know since I ordered a new sprocket this morning! :-) __________________ "Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350
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