I rechecked my position of my harmonic balancer w/ #1 @TDC and I'm off by about 15 degrees from having the arrow @12:00 .Would that cause a vibration in the 4000 - 5000 rpm range . ( the balancer does have wieghts)

 

I think you will need to experiment to get an accurate answer to your question. Can you just reinstall the hub to correct it 15*?

 

Thanks for the reply... I'm going to do that just to eliminate that aspect to see if that will correct the problem. I did a gear install,cloyes,and street twin install all basically at the same time and I've got a slight vibration I never had before.

 

I thought these engines were internaly balanced,which means the flywheel and damper are nutueraly balanced????

 

The LT1 is in fact externally balanced. The flywheel is the neutralizing force. The harmonic balancer is neutral so I doubt that will help. I would look at the clutch that is most likely the cause of your vibration. You may have to experiment with the pressure plate clock in relation to the flywheel. I am not familiar with the street twin to even know if that is possible, also you might give McCloud a call to see if it installs any certain way in particular. Hope that helps a little.

 

I've heard that if your balancer has no wieghts then the position really does'nt matter as far as causing vibration, but if it does it must be positioned exactly as before . correct me if I'm wrong

 

Myth I have heard of some cars having some weight on the balancer although I have never seen one. I do know that they all were positioned with the hub pointer if you will at 12 o'clock with #1 at TDC. So if your is only 15 degrees away from that I highly doubt that would cause an imbalance if you happen to have the weighted type. If it was 45 90 or even 180 out I might could see it being a problem otherwise I doubt your pulley is the culprit. But installing it correctly certainly can't hurt anything and it would take it off the list of possibles. Hope you have some luck I sure hope you don't have to yank the tranny back out.

 

cef97ws6, you maybe correct. I would still advise that he put the pointer to 12 o'clock at #1 TDC for future reference.

 

Thanks for the replies guys I'm going to put the pointer @ 12:00 w / #1 @ TDC to see if that helps , and go from there. I've already replaced u-joints/ made sure the drive shaft was positioned right., checked the tranny mount. The only thing left is to yank the tranny, and verify the shims on the StreetTwin.