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Old 05-09-2019, 06:04 PM
colorado_rider_450's Avatar
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Default CR500AF build considered

     

How's everyone doing today? I have recently caught the CR500AF bug, and am considering a build of my own. I thought I'd try to pick some savvy brains before I commit to this project. Currently, I have an 02 CRF450R that I bought for $300 with a connecting rod sticking out of the case. I got it a couple years ago intending to do a dual sport set up. Also, behind my landlords shed is his son's 1997 CR250 with half an engine that has been sitting for more than 5 years. Nothing on that bike is really usable aside from the frame. He said his kid will probably let it go for $200, I'm thinking about offering him $150. The steering stem is seized and I haven't looked much further into it since it's not mine yet.

So, my question is, would a 97 CR250 frame be a good choice for a 500, and would the 02 450 parts like triple tree, fuel tank, and swing arm mount up? I would imagine the 450 suspension is a little better, but that's why I'm here. As far as the engine, there are several CR500s for sale around my area that are as much as or less than buying just an engine.

Anyways, cheers guys, thanks for any input!
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Old 05-10-2019, 07:40 AM
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Here's the 450. I'll put up pics of the 250 when I can.


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Old 05-10-2019, 10:16 AM
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The 250


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Old 05-11-2019, 12:42 PM
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I'm no connoisseur on this, but my hunch is that since both would likely require modifying the frame (engine mount locations, exhaust, etc.) I would just fit the 500 into the 450 frame. I don't believe the cr250r frame has any handling or fabrication advantages over the crf frame. In fact, what I do know is that the first gen Honda aluminum frame was DEFINITELY a first attempt: they didn't quite have it figured it out yet. Second gen ('00-'01) was a better handling frame and third gen ('02+) was THE frame with regards to handling/chassis characteristics. Finally, I do believe a few have gone down this path and, if I remember correctly, they tend to favor the crf250r frame for some reason. Look into that to see what'd be the best way to go about it.
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Old 05-11-2019, 09:47 PM
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I agree with Gusco. The '02 cCRF frame was a difficult bike to turn. Straight line, OK.
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Old 05-12-2019, 09:04 PM
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Interesting. I had assumed the cr250 frame would be easier since it already has the 2stroke pipe contour. I can weld new top mounts but Iím not quite comfortable redoing the entire frame. My current ride is a 03 450 which is pretty well planted, so maybe modding the 02 frame is a good idea... alright thanks for the input, the research continues.
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Old 05-13-2019, 09:25 AM
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I also think the 02 frame would be the better candidate. Maybe one of the resident AF experts will chime in at some point.
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Old 05-16-2019, 03:33 AM
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If you end up buying the 97 also id buy the fuel tank if you wanted to sell it...keep me in mind
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