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post #1 of 22 (permalink) Old 07-03-2011, 02:41 AM Thread Starter
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Thumbs down crankcase...

well well well.... today i was riding my bike and BAM!.... my crankcase went..
the shifter lever side of the case is cracked and is not fixable...

where is a good place to pick a new case up? do i have to buy a set??

will the z400's case fit?

thanks guys
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post #2 of 22 (permalink) Old 07-03-2011, 03:02 AM
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Where did it break??? at the front sprocket...

It's a good idea to buy the set, for they are machined to a matching set...

Ebay has two sets to choose from for around $400.00...

kfx 450 crankcase | eBay

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post #3 of 22 (permalink) Old 07-03-2011, 03:08 AM
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Have you read this thread...???
Aluminum Frame repair... - Kawasaki KFX450 Forum :: KFX450HQ.com

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post #4 of 22 (permalink) Old 07-03-2011, 03:07 PM
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Quote:
Originally Posted by dom08 View Post
well well well.... today i was riding my bike and BAM!.... my crankcase went..
the shifter lever side of the case is cracked and is not fixable...

where is a good place to pick a new case up? do i have to buy a set??

will the z400's case fit?

thanks guys
Uhmmm...I`m 99.9999999999% sure that Z400 cases won`t work on the KFX450. (& that`s w/o actually going out & doing a somewhat basic apples to apples comparison of the side cases on my 2 Z`s vs. the side cases on my KFX450...if I did that I`d venture to say that I`d be bold enough to just say that it`d be a 100% no go for sure).

Now...I have to tend to think that there was a deeper issue going on here that caused it to "went" (i.e. broke/cracked). Did your chain de-rail or something like that?...or perhaps you were being a bit overly forceful while shifting? (you didn`t provide quite enough accurate details as to exactly where it broke...& if you were doing anything out of the norm that may have caused it to happen).

Or do these KFX`s have a known issue w/ side cases just being weak & blowin` out???

`08 KFX450 (White/Black)

~Phoenix Full Exh.
~FCI w/o box
~Procom Prog. ECU
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~G-Force Wheels w/ Maxxis Razr TT`s (Orange Label`s w/ extra grooving)
~Rath Swaybar
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~KOQ Chain Guide&Case Saver
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post #5 of 22 (permalink) Old 07-03-2011, 11:35 PM Thread Starter
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what happened was the previous owner cracked it... where the shifter rod comes out... he than JB welded it... and this weekend it gave out... a niiiiiice big hole

i was thinking of bringing it to a mechanic to do as i dont really know what i am doing... timing wise etc..
are there any "how to's" on changing the crankcase?
or is it best to bring it in?

how many hours are involved (after the engine is out)
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post #6 of 22 (permalink) Old 07-03-2011, 11:51 PM
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Buy a service manual..it will walk you right through it.

2008 Kawasaki KFX 450r:
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post #7 of 22 (permalink) Old 07-04-2011, 02:22 AM
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Quote:
Originally Posted by dom08 View Post
what happened was the previous owner cracked it... where the shifter rod comes out... he than JB welded it... and this weekend it gave out... a niiiiiice big hole

i was thinking of bringing it to a mechanic to do as i dont really know what i am doing... timing wise etc..
are there any "how to's" on changing the crankcase?
or is it best to bring it in?

how many hours are involved (after the engine is out)
Z400 is a completely different case. You can do it if ya get a service manual and you're careful about what you're doing. Document everything as you strip it down. You'll need to buy the pair unless you can find a good one used. I'd look on motosport.com...they're probably the best price you'd find. Also, while you're in the bottom end go ahead and replace all the bearings.

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post #8 of 22 (permalink) Old 07-04-2011, 02:37 AM
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Watch this and see if you can work...????


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post #9 of 22 (permalink) Old 07-04-2011, 12:30 PM Thread Starter
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thanks guys, ive watched the video... theres no way of repairing it

what about timing etc? is that pretty straight forward to do, if i have a manual?
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post #10 of 22 (permalink) Old 07-05-2011, 01:15 AM
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I have to tend to think that a good aluminum welder could fix it for ya though...& ya wouldn`t even have to take the motor out to do it.

Anyway...

As far as the timing & everything goes...the service manual shows & explains pretty much everything a person needs to know. It all basically just depends on your personal mechanical experience & ability & what you`re comfortable w/ doing. Quad & bike motors really aren`t that complex & mysterious! IF a person can tear down & rebuild a small block Chevy...then they can very easily tear down & rebuild one of these quad/bike motors!
Out of the modern day 4 strokes the Honda motor is probably the easiest & least complicated one to work on IMO.

If you`ve never torn into your motor even as far as to re-shim your cams (which I`m guessing that you haven`t ever attempted since you`re concerned about the timing) then I wouldn`t recommend that you even attempt to be replacing a side case or splitting the main inner cases as it would appear to me that you just don`t have the mechanical experience/ability at this point to pull it off successfully.

`08 KFX450 (White/Black)

~Phoenix Full Exh.
~FCI w/o box
~Procom Prog. ECU
~HC`s Stage 3
~ProFactory Hoses (White)
~Pro Armor Kill Switch Kit w/ Gunnar Killer
~AC Bumper
~Tusk Nerfs
~LSR PB BO
~G-Force Wheels w/ Maxxis Razr TT`s (Orange Label`s w/ extra grooving)
~Rath Swaybar
~CRJ Lowering Kit F/R
~G-Force Adj. Axle
~KOQ Chain Guide&Case Saver
~Wheel Spacers (Frnt.)
~Race Cut Fenders

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