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88' to 91' Honda CR250 HPP Cleaning and Setup info

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Hi All.

I keep seeing people having troubles with their HPP valves on the 88' to 91' Honda Cr250s. I have been working on restoring a 1988 CR250 and when I put my engine together I had a bit of a hard time getting the valves setup correctly myself. I had an 88' back when they were new and did work on it back then but forgot much of the setup. Once I relearned it I am pretty good at the setup now which is good as I have another engine to assemble soon. I thought I would share some of my references and answer any questions if anyone has any trouble with this. I have shared some good PDF versions of some of the sections from the manuals. If you are a facebook user try joining CRs Only. https://www.facebook.com/groups/771937119520313/files/ There is a files section there where you can download the FSM and owners manuals for these bikes. There are also a copy of my files focused just on the HPP valves posted there. Here is some of the info converted to Jpeg to post here. A couple of those pictures are the 86'/87' valve setup which is very similar. There are only a couple differences. The pictures help to get an idea of how it all fits in the engine. I hope this helps out a few folks. Feel free to ask any questions and I will do my best to answer. 

Greg

Eric Gore HPP info.png

1988 Honda Cr250 HPP service Pg2.jpeg

1988 Honda CR250 HPP Service Pg3.jpeg

1988 Honda CR250R HPP Service Pg1.jpeg

IMG_2837_zps05f4c2c5.jpg~original.jpeg

csteel81_#4.jpg

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:thumbsup::thumbsup: And one ounce of SeaFoam to EVERY 2.5 gal of premix with a high quality oil appropriate for your use will forever eliminate a need to clean them again.

Edited by YHGEORGE

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This is great, thank you! I'm building a '86 cr250, I will definitely be frequenting this thread now on how to do the powervalve.

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19 minutes ago, YHGEORGE said:

:thumbsup::thumbsup: And one ounce of SeaFoam to EVERY 2.5 gal of premix with a high quality oil appropriate for your use will forever eliminate a need to clean them again.

Yes. That might reduce the cleaning but there will always be a need to know how to disassemble and reassembly this stuff for other engine maintenance. Not to mention how to get them adjusted correctly. 

Greg

 

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18 minutes ago, ASP1227 said:

This is great, thank you! I'm building a '86 cr250, I will definitely be frequenting this thread now on how to do the powervalve.

The 86' 87' is just a little bit different but it is quite close. You still adjust bolt #4 for the correct spring closing preload. Just a couple of different pieces but same overall application.

Greg

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You can run the bike with the powervalve cover off? I thought that would be like an air leak and cause lean conditions.

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25 minutes ago, ASP1227 said:

You can run the bike with the powervalve cover off? I thought that would be like an air leak and cause lean conditions.

Being it is not on the intake or crankcase it is not an air leak. This is only a slight exhaust leak when running. No problem at all.

Greg

 

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On 8/17/2017 at 7:02 PM, bcavmechanic said:

Yes. That might reduce the cleaning but there will always be a need to know how to disassemble and reassembly this stuff for other engine maintenance. Not to mention how to get them adjusted correctly. 

Greg

 

That had already been addressed quite thoroughly.

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