Posts
70
Joined
9/26/2015
Location
Scottsdale, AZ
US
Edited Date/Time
12/31/2018 9:22pm
After totally grenading my 06 YZ 250 motor, I was going to pull the swingarm bolt out thinking I was just going to get a fresh motor and all would be great. Well, after soaking the pivot bolt for two days in wd40 and occasionally hitting on it, I took the bike to Ryan at Factory edge tonight and between him, his dad and I we absolutely could not get this thing out. We tried heating it, swinging at it for 2 hours with a 4 pound striking sledge, and the motor is loose on the bolt so we know the seizure point is on the bearings, and even using a 20 pound weight as a backstop for the other side of the strike to break it loose didn't work. I've heard of using air hammers/roto hammers with bull points, but I'm just afraid of actually having to take it to a machine shop or cutting the axle between the swingarm and engine cases. Need some helps peeps, what ghetto ways can help me get this bastard out?
The Shop
Good luck.
https://www.amazon.com/Nutek-Bolt-Off-Lubricant-BET-0002/dp/B002TNX3GY#
In your particular case this is likely pointless if it is stuck because of rust, because it can, and often does, take several days to a week or more for the kroil oil to penetrate deep enough, plus it works best with gravity, meaning that the bike should be placed on its side then the oil should be put on the top of the offending area.
It sometimes helps to make a "Dam" that will somewhat retain the oil so it doesn't simply run right off the area you need it on. You can try good quality masking tape or duct tape and wrap it around the pivot bolt boss in the frame if there is one.
Also contrary to the "test" that was done comparing 50/50 trans fluid and acetone, it is a superficial test and therefore does prove that it penetrates better then kroil oil, however, mixing a small percentage of acetone with kroil oil might improve its penetrating qualities and you could even call them and ask them what they think about adding acetone to their oil, however, their answer might not be completely accurate since they are biased towards their product and probably think it works best just as it comes out of the can.
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Pit Row
Here's another "comparison" that lists liquid kroil oil as the best and liquid wrench in 7th place.
https://autosneed.com/best-penetrating-oil/
"The April/May 2007 edition of Machinist's Workshop did a test of penetrating oils where they measured the force required to loosen rusty test devices. Buy the issue if you want to see how they did the test. The results reported were interesting. The lower the number of pounds the better. Mighty interesting results for simple acetone and tranny fluid!
Penetrating oil . Average load .. Price per fluid ounce
None ................. 516 pounds .
WD-40 .............. 238 pounds .. $0.25
PB Blaster ......... 214 pounds .. $0.35
Liquid Wrench ... 127 pounds .. $0.21
Kano Kroil ........ 106 pounds .. $0.75
ATF-Acetone mix.. 53 pounds .. $0.10
The ATF-Acetone mix was a 50/50 mix (1 to 1 ratio)."
We all see how bike tests go each year, so believe what you want to believe and use what you feel works for you.
I was aware of that one around 20 years ago, and that is also not a very unscientific test and it has been debunked by....machinists on a machinists forum, lol.
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Like I said, not going to argue about penetrating oil, use what you think works for you.
Post a reply to: Insanely Stuck Swingarm Bolt