I recently had a complete motor rebuild and I noticed that the new crank has the non taperd connecting rods. Is it possible to use a crank out of an 88 and use it in a 96" block? I have been wondering about this since the build. This would explain why the bike doesn't feel as powerful. Any comment's?

 

Are you saying you think your builder put an 88 crank in your 96, because you can somehow see that the con rods are tapered? Sorry but not following what you are driving at

 

The non tapered rods are an upgrade done while rebuilding the crank. The 88 crank is different on the output side anyway. It has course splines and a male thread. The 96 crank has fine splines and a tapped hole on the output side.

 

I don't know if its possible,but The strokes are 2 different lengths.the 88ci is a 4.00 stroke, & the 96 is a 4.375 stroke!!!

 

As was explained in the same post in the Engine section; it is possible but your compensator/stator assembly would not have fit. Looks like the builder did you a favor and installed rods from a TC88. The 88" rods and the 96" rods are the same length. The additional stroke comed from re-locating the crank pin in the wheels by .1875". The rods are not the problem on why the motor is down on power.

 

The rods on a 96" are longer than on an 88". The pistons between the two are the same diameter. A 96" engine is just a stroked 88".

 

You sure it's the crank pin? I'd read that it was the rods that were different lengths, not the crank. Always nice to learn something new when I am mistaken.

 

Yes, that's what I was thinking. And I say that because the bike ran like a scalded dog before, and now it run's ok but not like before. The compression seem's to be way down, and I say this because I can now run 89 octane without pinging. Next tank will be 87 octane, just to see if it pings. I also forgot to metion that I have a t-max auto tune and since the rebuild I have gone through 10 +degree's of timing and still can't get it to ping. I know that pinging is not good, but I am trying to find the sweet spot in the timing and with a 10+ degree change I thought I would have been there by now.

 

Yes, Only the new crank rod's installed in my bike are not taperd. From what I've researched the tapered are from 07 and up. From what I can tell the 06 and down to whatever are not tapered. That's what's in my 07 bike right now, no taper.

 

Absolutely the crank pin location; rods are both 7.667".