2000 yz 250 crankshaft..

[Bigdogdaddy69]

On my 2000 yz 250 the fly wheel side of the crank shaft is bad, the right is still good. Is it possible to just replace the left side or is that kinda stupid??

 

[Backslayer]

Cranks are relatively inexpensive I would just go get me a new hot rod crank and throw it in there, be sure to replace your bearings, and seals. A new complete crank with rod ,isn't but about 200 so I would go that route.

 

[Bigdogdaddy69]

yea i priced out the left side of crank and it was a few bucks cheaper then a whole one, figures. But yea i guess the next question is weisco crank or hot rod???

 

[whenfoxforks-ruled]

Wiseco may not be a rebuilt one. The hot rod will be.

 

[Pete Payne]

Both the Wiseco crank and the Hot Rod cranks are new units , they do not re-manufacure cranks , they make new ones .

 

[whenfoxforks-ruled]

Pete, is the blue around the pin hole not reminiscent of a fried big end bearing? I seen this on a brand new crank? In a hot rod box, through motosport on one of them engine kit deals. If the price is right, I really do not have an issue with remanufactured parts. I have seen brand new oem cranks out of spec. But never blue around the pin hole. So I assumed because it was cheaper, it was rebuilt? Wiseco says theirs are cnc machined.http://www.hotrodsproducts.com/inde...randid=10&modelid=81&modelyear=2000&enter=Go!, http://www.wiseco.com/Catalogs/Powersports/Comp-BottomEndCycleDirt.pdf. This model,wiseco's are cheaper? Wiseco has the whole bottom end kit for the same price as hotrods crank alone?

 

[Pete Payne]

whenfoxforks-ruled,
Ya know , I have seen that spot on alot of new cranks , OEM and aftermarket ,I have an OEM 01YZ 250 crank righ now , new in the box that has the blue spot on it . I believe that in the assembly they heat up the crank around the hole to make the pin drop in easier .

Pete

 

[whenfoxforks-ruled]

Me, I would have the crank halves in an oven. If I had to do it in a garage, with a hammer and block of wood. Maybe then a torch? In a shop with a big honking press, heat is not an issue. On the other hand, what would be the issue with rebuilding cranks? I have never seen a damaged crank halve? The nifty little covers that came on some, made rebuilds impossible.

 

[Pete Payne]

The CR cranks are known as "Tin Can" cranks because of the tin like shell that is stamped to the outside of it to displace volume . The best way to rebuild them is with one of the crank assembly jigs.

Oh yeah , some of the newer YZ cranks 1996 and newer have a plastic stuffer that goes in the area of the pin , this is light weight , like the idea of the tin can , and displaces volume , but when the crank is failing and gets hot , it is the first thing to melt .

 

[whenfoxforks-ruled]

Suzuki had them also. Have you ever seen one of these cranks "rebuilt" without a jig? Why is all my fillings vibrating out at high rpm? And the premature hand fatigue! I hold my rebuilders phone numbers close to my heart, that use a jig! (Eric Gorr)

 

[Pete Payne]

Yeah with out a jig it takes a little more time . I have done it both ways . But I really like my crank tool :)