upper motor mount bolt 2003 mastiff

Energy One
Broton

Broton

Member
I have looked through here but havent been able to locate the size of the upper motor mount bolt on my 03 mastiff. It has vibrated out and three dealerships couldnt tell me what the bolt size was. How are they supposed to replace a part they dont know what is? I believe it is close to 1/2 but dont know if 20 or 13. I sure hope its not metric! Plus this time I plan on hitting it with red thread lock. Any help is appreciated.
Shawn
 
E

Eric

Banned
I think mine is 7/16 but its fine thread, not sure this helps though...my bike is a 07,, not sure if thay changed it by then..
 
K

kurtxt

Chopperman
When you get your bolt make sure you loctite red.Mine have come loose and it causes a lot more vibrations.
 
Broton

Broton

Member
Thanks To All

I just wanted to say thanks to everyone for your posts. I have figured out it is a 1/2- 20 (fine thread) Bolt. for future reference.
I did lock tight red so hopefully it wont happen again. I ended up having to drop the ignition and took off that side of the gas tank so i could get to the mount. I ended up having to tap the threads because it appeared that the bolt was cross threaded before and that is why i couldnt get it started. All is good now and a two hour fix!
 
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