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Michael Taksa
Joined: 25 Jul 2001
Posts: 1401
Location: United States, Massachusetts, Boston
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 Posted: Mon Nov 19, 2012 7:58 am Post subject: How to check the crank on CR125, How much play? |
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Doing top end on stock CR125 and would like to check the crank bearing play. How much up/down or side/side play is OK? Do you check by grabbing the rod and moving by hand?
Thank You. |
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Greg Lindahl
Joined: 13 Jan 2011
Posts: 267
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| Posted: Mon Nov 19, 2012 10:48 am Post subject: |
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You "rock" the small end from side to side while the large end is in the middle of its bearing and measure the length the small end moves. Check the measured length against the tolerance specified in the Honda CR 125 manual.
If you don't have a manual, get one, it's a great investment in engine longevity and "economical" race engine maintenance. |
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Michael Taksa
Joined: 25 Jul 2001
Posts: 1401
Location: United States, Massachusetts, Boston
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| Posted: Mon Nov 19, 2012 4:55 pm Post subject: |
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| The cut window on piston and "IN" is facing the carb, correct? |
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valentin yakimenko
Joined: 05 Sep 2012
Posts: 20
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| Posted: Tue Nov 20, 2012 7:12 am Post subject: |
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Yes, the the side with window cut in piston faces carb. Make sure you drill the exhaust side if it doesn't have holes already.
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Toys: 2000 CRG storm powered by cr 125 Stock Moto.2007 F 350 powerstroke. 2012 Yamaha Raider 113ci |
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Michael Taksa
Joined: 25 Jul 2001
Posts: 1401
Location: United States, Massachusetts, Boston
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| Posted: Tue Nov 20, 2012 8:25 am Post subject: |
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| Can't touch it, "Stock Honda", no mods of any kind. |
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valentin yakimenko
Joined: 05 Sep 2012
Posts: 20
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| Posted: Tue Nov 20, 2012 9:01 am Post subject: |
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I belive that is allowed. Let's see.what others gotta say. Im talking bout drilling two holes on piston's exhaust side for lubrication. It will not make you faster, but will prolong the life of piston and cylinder!
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Toys: 2000 CRG storm powered by cr 125 Stock Moto.2007 F 350 powerstroke. 2012 Yamaha Raider 113ci |
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valentin yakimenko
Joined: 05 Sep 2012
Posts: 20
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| Posted: Tue Nov 20, 2012 9:03 am Post subject: |
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Here's more info on how to do this. http://metal-matrix.com/s/index6.html
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Toys: 2000 CRG storm powered by cr 125 Stock Moto.2007 F 350 powerstroke. 2012 Yamaha Raider 113ci |
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Michael Taksa
Joined: 25 Jul 2001
Posts: 1401
Location: United States, Massachusetts, Boston
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| Posted: Tue Nov 20, 2012 10:03 am Post subject: |
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| So will the oringed head gasket, but that is not allowed either. |
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valentin yakimenko
Joined: 05 Sep 2012
Posts: 20
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| Posted: Tue Nov 20, 2012 10:10 am Post subject: |
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I don't have anything to proove, just trying to help. I will run that, till I'm told not to by officials..
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Toys: 2000 CRG storm powered by cr 125 Stock Moto.2007 F 350 powerstroke. 2012 Yamaha Raider 113ci |
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John Motley
Joined: 09 Jul 2002
Posts: 83
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| Posted: Tue Nov 20, 2012 11:11 am Post subject: Exhaust side piston holes |
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Consider yourself "told', if you run SKUSA events.
John Motley
National Technical Director
SKUSA |
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valentin yakimenko
Joined: 05 Sep 2012
Posts: 20
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| Posted: Tue Nov 20, 2012 11:27 am Post subject: |
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All we got is wka...here
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Toys: 2000 CRG storm powered by cr 125 Stock Moto.2007 F 350 powerstroke. 2012 Yamaha Raider 113ci |
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Noah Stark
Joined: 02 Mar 2003
Posts: 1179
Location: United States, Pennsylvania, Pittsburgh
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| Posted: Wed Nov 21, 2012 1:34 pm Post subject: |
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And if you run WKA roadrace series Stock Honda class, also consider yourself told. You will be DQ'd on the spot for drilling those holes. It is not allowed.
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Noah Stark
RIP my friend:Paul Dana you will be missed by many |
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valentin yakimenko
Joined: 05 Sep 2012
Posts: 20
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| Posted: Wed Nov 21, 2012 1:41 pm Post subject: |
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Lol...damn...thanks guys....wonder why is it illigal to prolong the topends life...but thanx anyways...
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Toys: 2000 CRG storm powered by cr 125 Stock Moto.2007 F 350 powerstroke. 2012 Yamaha Raider 113ci |
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Gerry MacNutt
Joined: 14 Apr 2012
Posts: 109
Location: Canada, not USA state,
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| Posted: Wed Nov 21, 2012 8:39 pm Post subject: |
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| valentin yakimenko wrote: | | It will not make you faster |
While you won't be able to measure it on a dyno it would actually cost you a bit of power as it bleeds around the bridge and in turn drops drops crank case pumping slightly. Releive the bridge in the proper fashion and you will have no need for the holes. Bridge holes are for forged pistons. |
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valentin yakimenko
Joined: 05 Sep 2012
Posts: 20
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| Posted: Thu Nov 22, 2012 3:23 am Post subject: |
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Sorry, I'm new here, what's the propped fashion to relieve the bridge?
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Toys: 2000 CRG storm powered by cr 125 Stock Moto.2007 F 350 powerstroke. 2012 Yamaha Raider 113ci |
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