Its time for crank updates

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cannibalq8 · #81 Post by **cannibalq8** » Fri Sep 24, 2004 4:55 pm

Great news wistech

.. keep update us

wistech · #82 Post by **wistech** » Tue Sep 28, 2004 3:10 am

I think after this weekends abuse with C27 I think its safe to say that there is no major flaw with the z400 bearing . The Dunbar trails have several areas where you can run flat out for several minutes at a time so if there was a flaw it would have grenaded then.

Here is a pic of a bearing with the low milage cage compared to a high mileage cage. The one on the bottom has .005" of the metal worn off from rubbing on the rod journal. The one on the top still has some copper coating on the low spots. I was able to reuse the rod that ran with the top cage .

Jctmotorsports · #83 Post by **Jctmotorsports** » Tue Sep 28, 2004 3:41 am

The FX was way underrated. Mine runs so hard it's sick. Makes the moto not feel so good. I'm half temped to make a "hybrid" motor out of the two.

iceracer17 · #84 Post by **iceracer17** » Wed Sep 29, 2004 12:04 am

Wistech,was it a battery problem on sat.?

cannondale27 · #85 Post by **cannondale27** » Sat Oct 02, 2004 1:58 am

His battery shorted out.New batt and good to go.

cannondale27 · #86 Post by **cannondale27** » Sat Oct 02, 2004 2:01 am

I thought I would post another pic of a failed crank I pulled apart tonight.This one I did on a regular home use press no problem.Notice how the cage is welded to the pin.No evidence of heat other than the cage being stuck to pin.All the rollers were perfect.

cannondale27 · #87 Post by **cannondale27** » Sat Oct 02, 2004 2:03 am

Check out this rod wear.Notice the middle where cage cant hit is perfect.Problem is that little bit will never support the bearing enough.

cannondale27 · #88 Post by **cannondale27** » Sat Oct 02, 2004 2:11 am

Thanks to Brad Oakley who has sent me a new crank I will have the opportunity to pull apart a New crank.So far here are my measurements.Tommorrow I will split the crank and check out the guts.

Runout=.001 clutch side
Runout=.0005 flywheel side
Rod side clearance =.017-.018
Crank Width=2.473
No Sludge in crankpin at all
Rod Big end ID=1.69425 Perfectly round

Its a shame to pull it apart since so far it is perfect but we can learn from this.Thanks Brad:clap:

wistech · #89 Post by **wistech** » Sat Oct 02, 2004 2:16 am

That one is nasty. A few more hours and it would look like this.

cannondale27 · #90 Post by **cannondale27** » Sat Oct 02, 2004 5:23 pm

Pic of a brand new crank inside(Brad Oakleys)

Stock bearing