Torque values change when you have a higher compression ratio courtesy of a BB351 . I'm not 100% sure, but from my observations the bike vibrates much more with the 351 than it did with the stock bore.

I did put Loctite on the axle bolts this time around. That could have been a serious early season injury. It actually kind of scared me and was a slap on the back of the head for my stupidity in not checking it out.

You guys will laugh at this, I STILL haven't picked up a torque wrench or a service manual. I have used the service manual that is stickied for the 2009(I have a 2006) and borrowed a torque wrench whenever I need one.

I can't find one online that looks small enough to be able to fit in all the nooks and crannies on the bike AND has the appropriate torque value ranges for the bike.

I'm up for any suggestions!

 

Mine doesnt vibrate any more..... and i used the torque values out of the service manual to put mine back together. If you havent used a torque wrence to put it back together how do you know if you increased it? How do you know that the torque is all the same. My dad, a mechanic for over 30 years, still uses a torque wrench to put motors back together. The amount of torque isnt actually that critical its to make sure that the are torqued to all the same amount is whats more important....

 

I would imagine not much in torque values have changed from the 2006 to the 09. I have a copy of both just in case

The pre '09 manual is floating around here somewhere, I downloaded it a few years ago.

 

That's what I was planning on doing as well when I get mine. Does anybody else have any input as to why and what torque values should be "if" they are different. This is the first time I've heard of this.

 

Ill find out.

 

Really?

I'd like to see the source of this information re: torque values due to compression with the 351. Where did you get it jhoffy?

And along with EMS, my bike does not vibrate any more with the 351 than it did when it was a 250.

 

I didn't word that right at all. I jumped to one deduction from another. Let me start over.

I assumed that with the 351 that the bike would vibrate much more than it does when it is stock and also have a different frequency more capable of vibrating stuff loose such as nuts. Whether it vibrates "more" or not is in question.

To counter this, would it not be wise to assume that thread locker may be more appropriate post-351? Obviously you wouldn't increase the torque values in delicate areas such as the engine head since it's aluminum but places such as the axles, etc.

I'm just rambling.

 

Torque values are based on the fasteners being used. The bigger the nut or bolt is the higher the torques value will be... usually. The material also plays a part. If you find conflicting values, I would use the newer version. The mfg may have corrected a mistake. (maybe)

 

...and of the parent material being used. Are heli-coils/thread inserts being used in the big bore kits?

I do agree with the torque being equal, and with any kind of fasteners.

Increasing the torque value would not be a good idea since stock fasteners stretch so badly from my experience. I have not done this big bore setup, was just tossing around the concern.

 

I think you need to take a read up on this article, really cool and informative.
You will find that the torque values post 351 will be exactly the same and should be

http://www.pirate4x4.com/tech/billav...lts_signed.pdf