Front sprocket nut stuck

GetItOnLikeTron
Edited Date/Time 4/15/2021 8:17pm
Hey I have a 2020yz250f and am changing sprockets and I can’t get the front sprocket nut off. I tried using a Dewalt impact couldn’t get it then had someone stand on the rear brake while I had a breaker bar and it is rounding off the nut instead of spinning it. Any suggestions
|
Rickyisms 4/11/2021 6:49pm
4/11/2021 6:49pm
Find a friend with an air impact.
1
1
Rider 5280
Profile picture for user Rider 5280
Posts
2399
Joined
11/9/2011
Location
Denver Metro, CO, USA
Rider 5280 4/11/2021 7:03pm
4/11/2021 7:03pm Edited Date/Time 4/11/2021 7:27pm
I'd apply penetrating oil LIBERALLY several times prior to hitting it with the impact gun - and let the oil work for at least 4 hours between applications (before work or before bed is always easy). Yep, 4 hours is an arbitrary number, but it always seems to need hours and multiple applications in my experience.
1
Rider 5280
Profile picture for user Rider 5280
Posts
2399
Joined
11/9/2011
Location
Denver Metro, CO, USA
Rider 5280 4/11/2021 7:30pm
4/11/2021 7:30pm
Just in case ... you were sure to bend the lock washer tabs down flat, yes?
1
1

The Shop

See All »
GetItOnLikeTron 4/11/2021 8:13pm
4/11/2021 8:13pm
Rider 5280 wrote:
Just in case ... you were sure to bend the lock washer tabs down flat, yes?
Yea I bent it flat
3
garasaki
Profile picture for user garasaki
Posts
208
Joined
1/20/2021
Location
Mount Vernon, IA, USA
garasaki 4/13/2021 7:29am
4/13/2021 7:29am
I went through this last year. Heat, penetrating oil, and pneumatic impact wrench was my solution as well.

Once you get it off, it ain't bad at all.

(I used this as an opportunity to get myself tooled up with pneumatic impact stuff)
1
stone881
Profile picture for user stone881
Posts
856
Joined
12/26/2014
Location
Fruita, CO, USA
stone881 4/13/2021 8:27am
4/13/2021 8:27am
Did you try putting a box end wrench on there and hitting it with a hammer to break it loose?
1
mxracer666
Profile picture for user mxracer666
Posts
781
Joined
10/28/2010
Location
NE Iowa, IA, USA
mxracer666 4/13/2021 9:25am
4/13/2021 9:25am
Sprocket Stuff counter sprocket tool. Everything is easier when you use the right tools for the job!
willbilly
Profile picture for user willbilly
Posts
408
Joined
6/28/2016
Location
Corpus Christi, TX, USA
willbilly 4/14/2021 5:56pm
4/14/2021 5:56pm
When using an impact wrench make sure the tranny is not in gear for extra resistance. Can damage gears and dogs. Only use chain and brake or jam a piece of wood in sprocket hole. Good luck.
2
Rider 5280
Profile picture for user Rider 5280
Posts
2399
Joined
11/9/2011
Location
Denver Metro, CO, USA
Rider 5280 4/14/2021 7:24pm
4/14/2021 7:24pm
Also suggest anti-seize on the threads when you reinstall the nut.
1
Rider 5280
Profile picture for user Rider 5280
Posts
2399
Joined
11/9/2011
Location
Denver Metro, CO, USA
Rider 5280 4/15/2021 12:02am
4/15/2021 12:02am Edited Date/Time 4/15/2021 1:44am
It's got a lock washer.

The driveshaft tightens the nut naturally with rotation.

That's a double-locking configuration.

On my older Hondas - which employ a counter sprocket bolt and no locking washer (they do use a Belleville washer however) - I used blue LocTite. Good advice for this application MKMX.
1
GetItOnLikeTron 4/15/2021 12:27am
4/15/2021 12:27am
I was able to get the nut off with heat a lot of pb blaster and a impact
3
Rider 5280
Profile picture for user Rider 5280
Posts
2399
Joined
11/9/2011
Location
Denver Metro, CO, USA
Rider 5280 4/15/2021 12:34am
4/15/2021 12:34am Edited Date/Time 4/15/2021 8:17pm
Congrats - now back to your regularly scheduled program!

Remember to add anti-seize to make life easier down-the-road!
1
1

Post a reply to: Front sprocket nut stuck