Forum Main Tech Help/Race Shop Kx500 Main bearing race case repair

Kx500 Main bearing race case repair

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Paul_Pitzonka

Vital MX member Paul_Pitzonka 63534 Paul_Pitzonka https://p.vitalmx.com/photos/users/63534/avatar/c50_5E1DC8B2_775B_4192_932A_9241D4908AA2_1531363287.jpg?1531362996 https://www.vitalmx.com/community/Paul-Pitzonka,63534/all 05/01/18 2 22 618

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Joined: 5/1/2018

Location: Grand Terrace, CA USA

7/12/2018 8:03 PM

One of the case halves I have has a severly oblonged out Main bearing race from the bearing being severely worn out... I’ve seen it before where they were a loose press fit and could still be used with some minor work... but this one has probably .040in of play between the bearing and the race... is it possible to have someone machine the old race out and machine/install a new race? I’m pretty sure you could find the center of the hole from the crank seal bore... if anyone has any input (other than buy a set of cases) it would be greatly appreciated...

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mwssquad827

Vital MX member mwssquad827 53630 mwssquad827 https://p.vitalmx.com/photos/users/53630/avatar/c50_IMG_0334_1484359220.jpg?1484358460 https://www.vitalmx.com/community/mwssquad827,53630/all 08/04/16 6 49 1180

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Location: Twin Falls, ID USA

7/12/2018 8:50 PM

I would take it to a machine shop and just throw some ideas around with them...

I would think that if you found center you could weld/add material then massage it to what you need, but I maybe just taking out my ass

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Joko

Vital MX member Joko 24924 Joko https://p.vitalmx.com/photos/users/24924/avatar/c50_001.jpg?1363569845 https://www.vitalmx.com/community/Joko,24924/all 01/02/11 2 209 771 6

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Location: Cromwell, CT USA

7/12/2018 9:51 PM

I think a bushing repair is possible. Contact Tom Morgan Racing, he’ll know what to do

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sandman768

Vital MX member sandman768 42556 sandman768 https://p.vitalmx.com/photos/users/42556/avatar/c50_F76D1A6F_DC4E_40AC_ABA0_EE9DD9BF0634_1576515004.jpg?1576514241 https://www.vitalmx.com/community/sandman768,42556/all 03/21/14 15 https://www.vitalmx.com/community/sandman768,42556/setup 94 3705 63 1

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7/13/2018 2:51 PM

Go on kxriders.com......there is a wealth of info on he site...there arę ovesized mail bearings, I think.... Honda bearings, the cases can also be repaired by a motorcycle specific machinę shop.

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kb228

Vital MX member kb228 61852 kb228 https://p.vitalmx.com/photos/users/61852/avatar/c50_48AD01BA_8BE7_43D5_B767_B4A5D12AFA64_1538263085.jpg?1538262140 https://www.vitalmx.com/community/kb228,61852/all 01/31/18 3 74 5708 1

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7/13/2018 7:21 PM

You would need the bore welded up and remachined. The only problem i see is having a place to pick up the center of the bore. If its oblong the machinist wont be able to zero out the center. You might be able to put the other half on with the dowel pins installed between the cases and zero off the opposite side of the bore. Im not sure if thats accurate enough but worth a shot.

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Paul_Pitzonka

Vital MX member Paul_Pitzonka 63534 Paul_Pitzonka https://p.vitalmx.com/photos/users/63534/avatar/c50_5E1DC8B2_775B_4192_932A_9241D4908AA2_1531363287.jpg?1531362996 https://www.vitalmx.com/community/Paul-Pitzonka,63534/all 05/01/18 2 22 618

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Location: Grand Terrace, CA USA

7/13/2018 8:39 PM

kb228 wrote:

You would need the bore welded up and remachined. The only problem i see is having a place to pick up the center of the bore. ...more

...more

I’m pretty sure I can find bore center from the crank seal bore... I believe that would have the same center as the main bearing... I have some calls out to machinists right now so I can get some input on what they think they can do...

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kb228

Vital MX member kb228 61852 kb228 https://p.vitalmx.com/photos/users/61852/avatar/c50_48AD01BA_8BE7_43D5_B767_B4A5D12AFA64_1538263085.jpg?1538262140 https://www.vitalmx.com/community/kb228,61852/all 01/31/18 3 74 5708 1

Posts: 5786

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Location: Mansfield, OH USA

7/14/2018 6:17 AM

kb228 wrote:

You would need the bore welded up and remachined. The only problem i see is having a place to pick up the center of the bore. ...more

...more
Paul_Pitzonka wrote:

I’m pretty sure I can find bore center from the crank seal bore... I believe that would have the same center as the main ...more

...more

Seals wont be accurate enough to zero it out either.

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Mr. Robinson

Vital MX member Mr. Robinson 42138 Mr. Robinson https://p.vitalmx.com/photos/users/42138/avatar/c50_FG_604_2T_1464676833.jpg?1464675946 https://www.vitalmx.com/community/Mr-Robinson,42138/all 02/13/14 3 1 17 540 22 2

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Joined: 2/13/2014

Location: IN, USA

7/14/2018 10:29 AM

I have fixed this sort of problem two ways;

One, machine a bearing sleeve for the case then press and peen in place.

The other is to go with a bearing with a larger OD and machine the case to accept it.

Any decent machine shop should be able to do either of these.

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Paul_Pitzonka

Vital MX member Paul_Pitzonka 63534 Paul_Pitzonka https://p.vitalmx.com/photos/users/63534/avatar/c50_5E1DC8B2_775B_4192_932A_9241D4908AA2_1531363287.jpg?1531362996 https://www.vitalmx.com/community/Paul-Pitzonka,63534/all 05/01/18 2 22 618

Posts: 640

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Location: Grand Terrace, CA USA

7/15/2018 4:16 PM

Joko wrote:

I think a bushing repair is possible. Contact Tom Morgan Racing, he’ll know what to do

...more

Thank you... he knew exactly what I was talking about said he’s fixed a bunch of them... just machines the inner race and installs a larger bearing... compared to everyone else I’ve spoken with his fix by far seems the most simple and best fix in my opinion.... will post photos when I get it back

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