CR 125 Polymide main bearings---- Mystery Solved.?.?

allan steele · Joined: 14 Apr 2010 Posts: 59

I'm doing my first moto build which i'd rather not have blow up the first day out.. so i'm trying to double check everything. anyway i got these bearings from Fastech;

Main Bearings #6322 - NTN Polymide

they have what looks like seals on one side and i can't find info on which way they face.. can anyone point me in the right direction?

Also i've been reading on how to make the crank slip fit, i see honing the bearings and also putting the crank in a lathe and taking some off. What's the prefered method and is there a step by step info on how to do it?

thanks..

?Solved?
Ok, according to my local engine builder the seals face toward the crank.. but i ended up buying a set of honed bearings so i can slip fit without having to do any work, anybody want to buy these fancy bearings?

Tom Barth · Posted: Wed Feb 22, 2012 5:58 pm Post subject:

I'm not sure that I am right but have had no problems by installing bearing with open side to the case.
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larry leavitt · Joined: 04 Sep 2011 Posts: 93

why in the world would you run two seals? use 63/22c3 or 63/22c4 bearings.
and don't slip fit your crank(do you really need to) vibration kills power and parts.

Steve Eady · Joined: 26 Jul 2001 Posts: 956

If you are running the engine in stock moto class they must be the stock OEM bearings. And yes do slip fit the crank, not the bearings. Just polish the journals on a lath if you can a little at a time, just until the bearings slide on.

Steve @ www.extremegokarts.com
on-line store

allan steele · Joined: 14 Apr 2010 Posts: 59

thanks..

i keep hearing arguments both ways on the slip fit crank, i'm leaning toward the slip fit.

i thought i read somewhere (probably this forum) that these bearings were legal and the ones to use?? i'm not sure if they are seals, they look like two bands inside the bearing.

John Motley · Joined: 09 Jul 2002 Posts: 83

Only stock bearings and seals are allowed in the Stock Honda clqass in either SKUSA or IKF. If you are running a Mod Honda -- no problem.

larry leavitt · Joined: 04 Sep 2011 Posts: 93

the stk part # is 91002-ke1-014. the bearing #is 63/22c4. you cant go wrong
with stk!

larry leavitt · Joined: 04 Sep 2011 Posts: 93

steve what is your reason for slip fit ?

Chris Reinhardt · Posted: Fri Feb 24, 2012 12:03 pm Post subject: Re: Cr125 main bearings

Chris Laird · Posted: Fri Feb 24, 2012 1:07 pm Post subject: Re: Cr125 main bearings

Randy Mckee · Posted: Fri Feb 24, 2012 1:44 pm Post subject: Re: Cr125 main bearings

allan steele · Joined: 14 Apr 2010 Posts: 59

so nobody runs these bearings? i swear i read some where that all the cool guys are using them.. i just wanna be cool. And "slip fit" is the hippest buzz word in the karting circle right?

Chris Reinhardt · Posted: Fri Feb 24, 2012 3:10 pm Post subject:

I would in no way condone such behavior Rolling Eyes

I'm just saying.....

They'll split a briggs tator digger into 100 pieces and mic ever nut and bolt.

CR
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larry leavitt · Joined: 04 Sep 2011 Posts: 93

if you want i will be glad to explain the "NO slip fit" deal or you could just listen to chris he is correct!

Jimmy McNeil · Posted: Fri Feb 24, 2012 7:48 pm Post subject: