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Old 12-20-2016, 07:25 PM
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Default 2001 CR250

     

A decent, but blown up, CR250 followed me home this evening. I got a decent price (I think...) and I'm looking to get it in decent shape and selling it. I'll probably start tear down this weekend. Looking forward to the project and, hopefully, making a little side money off the build. It won't be a restoration level or even a full build. From the initial inspection the connecting rod feels alright, but I'm going to split the cases anyway to check the conditions in there and will probably do the main bearings. The piston was seized and I'm going to clean up the cylinder a bit and see what I'm working with.
QUESTION: Is it a good idea to clean it up with some WD40 and a green scotchbrite pad and measuring variance in ring end gap with an old ring before deciding to send it out for plating?
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Old 12-21-2016, 07:36 PM
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I cleaned up a bit today to make sure everything was there. As of now, only the headstays are missing and the PO is going to check if he has them. The cylinder has some aluminum from the piston and I checked the ring end gap with the rings off my '00 CR250. Interestingly enough, the gap is tight at .010, but consistent through the bore. The Nikasil seems to be intact though. Is there any known methods for cleaning the aluminum off the cylinder wall? A quick search turned up muriatic acid, but I've never done it... can anyone confirm, deny, or offer any advice on using this method?
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Old 12-21-2016, 08:50 PM
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That method will work. Remember it is a caustic acid and go lightly.

Paw Paw
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Old 12-21-2016, 08:59 PM
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Thanks for the input. I'll give it a shot and see if this cylinder is salvageable without replating.
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Old 12-22-2016, 12:28 AM
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the gap seems to be too low, best would be to properly measure the bore because by the ring end gap figure you cannot be sure that the cylinder is totally round
it would be nice if you could post up a few pictures of the cylinder plating.

other than that you have big luck on the cylinder, happy build up!
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Old 12-22-2016, 03:16 PM
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Quote:
Originally Posted by byronk View Post
the gap seems to be too low, best would be to properly measure the bore because by the ring end gap figure you cannot be sure that the cylinder is totally round
it would be nice if you could post up a few pictures of the cylinder plating.

other than that you have big luck on the cylinder, happy build up!
Thanks! You're right... maybe I should call around to machine shops to have the cylinder measured and see if they have a ball hone to hit it with.
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Old 12-23-2016, 12:07 AM
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It seems I've run into my first major snag: The headstays are missing and they are NLA. Any tips to get going in the right direction?? PO is saying he can't find them
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Old 12-23-2016, 03:03 AM
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Honda Motorcycle Parts 2001 CR250R A CYLINDER HEAD Diagram

www.servicehonda.com

or ebay? make sure to get the 1997-2001 studs (previous engines are shorter)

also check this guy out,
https://titanclassics.com/product/ho...um-head-studs/

maybe if you contact him he might make you a set out of Ti.
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Old 12-23-2016, 08:58 AM
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Going ti sounds more expensive than the level to which I want to build this bike. However, of unable to track them down, it may be my only option. ICOULD put them on my '00 and swap the stockers over to this one.
Does anyone know if the part is exclusive to the '00-'01?? There are a few on ebay, but mostly for older years.
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Old 12-23-2016, 02:02 PM
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It's easy to cross reference part numbers on partzilla or motosport, etc to determine interchangeability.
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