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MR250 Bearing kit
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Author:  t.read [ Fri Dec 14, 2012 7:23 pm ]
Post subject:  MR250 Bearing kit

I'm finally getting around to actually rebuilding my motor for this. Got slammed with work this past year and had a lot of racing going on last year. Didn't even get to this year unfortunately. But I finally was able to get that stubborn flywheel to come off which was a nightmare. Got the cases ready to split, so I'm looking around for bearings and seals.

I was curious if the CR250 or MT250 of this year had the same bottom end, bearing sizes and all? I did a few searches, but didn't see anything that said for sure. I found a place on Ebay that has a bottom end bearing and seal kit for the CR for $70.

Author:  safetyfast [ Sat Dec 15, 2012 9:12 pm ]
Post subject:  Re: MR250 Bearing kit

You can compare the part numbers on a site that has the original microfiche. I've been using this one: http://honda.woodsfuncenter.com/fiche_select.asp

Author:  t.read [ Sun Dec 16, 2012 9:57 am ]
Post subject:  Re: MR250 Bearing kit

That's what I ended up doing. I looked at the Western Hills Honda parts fiche. Seems that all bearings from CR, MT and MR are the same except for the countershaft bearing. The mainshaft I guess you'd call it. I don't have my numbers in front of me, I wrote it all down, but I think the MR has a smaller one. I think the CR and MT were the same though. I'll put up a chart later on here for future reference for others.

I found an eBay store, Boss Bearings, that had a CR bottom end kit that had every bearing but that one oddball. The MR has a 6304 which are easy to find as opposed to a 63/22 I think was the CR, MT number.

Author:  b-joe [ Tue Dec 18, 2012 12:59 pm ]
Post subject:  Re: MR250 Bearing kit

t.read wrote:
I found an eBay store, Boss Bearings, that had a CR bottom end kit that had every bearing but that one oddball.

2 or 3 jears ago i bought there an engine bearing & seal kit for my 80 cr250.
bearings were cheapest no-name, not C3 spec where needed.
seals hat not the same spec as original, no dustlip , some were not as thick as it has to be.
all shit, never more.... :(

Author:  t.read [ Fri Dec 21, 2012 11:25 am ]
Post subject:  Re: MR250 Bearing kit

Well, I was hoping I wouldn't have the same experience. All the bearings are either HBC(Chinese) or no name or part number at all. I'm sending them back and just ordering the part numbers from a bearing supply place I get other stuff from. Should've just done that in the first place. Thought if I get a kit, it would be easier. At least they will give me a refund, but it's going to be a pain in the ass shipping them back and waiting for one.

Moral of the story, Boss Bearings lies. They told me all kits were Koyo, Nachi, or similar Japanese bearings.

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