Compression 2001 CR250

B

BBdotcom

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Sep 26, 2004

104

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• Oct 22, 2004

• #1

Hi Everyone, Tomorrow I'm going to be buying my first CR250 :yeehaw:
Two buddies of mine are coming along to check out the bike
both have been riding motocross for years, one of which is a mechanic, He asked me to find out what the manual says is the compression for a 2001 CR250. He knows what the ballpark figures are for a 250 seeing he owns a RM250, but wants the one that Honda states in the manual.
Can anyone help me out here? :worship:
Thanks
Tom

 

CR3999

Member

Feb 28, 2000

163

2

• Oct 22, 2004

• #2

I have a shop manual And it is not in there. Just the compression ratio.

 

B

BBdotcom

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Sep 26, 2004

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• Oct 22, 2004

• Thread starter
• #3

Bummer! ...Thanks for taking the time to look for me
Do you or anyone know from experience what the highest & lowest acceptable compression should be on a 01 CR250?
I'll more than likely be buying the bike tomorrow, owner says it has about 80 hours use on it and the piston and rings were done this past June. I have a couple of pictures of the bike and it really looks like new. Tomorrow can't come fast enough
Thanks for all the help
Tom

 

Faded

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Jan 7, 2003

842

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• Oct 22, 2004

• #4

Stock should be around 185-190psi if I remember correctly.

 

B

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• Oct 22, 2004

• Thread starter
• #5

Thanks Faded! I'll pass on the info to my friend
Thanks
Tom

 

M

Mike_socal

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Oct 1, 2003

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• Oct 22, 2004

• #6

Faded said:

Stock should be around 185-190psi if I remember correctly.

Click to expand...

On a warm or cold engine?

 

Faded

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Jan 7, 2003

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• Oct 22, 2004

• #7

Mike[socal] said:

On a warm or cold engine?

Click to expand...

Cold, with the throttle opened all the way.

 

B

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Sep 26, 2004

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• Oct 22, 2004

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• #8

whats with the throttle being fully opened, i asked my friend about that and he said it doesn't make a difference??Note he isn't a mechanic and could be wrong
Tom

 

darringer

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Dec 2, 2001

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• Oct 22, 2004

• #9

The engine needs to draw in fresh air through the carburetor to get an accurate reading. If the throttle is closed, when the piston tries to draw fresh air/fuel into the cylinder it will create low pressure in the bottom end and will not fill the cylinder completely during the compression stroke.

 

B

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Sep 26, 2004

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• Oct 22, 2004

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• #10

Thanks Everyone, :worship:
Now if tomorrow 3:30pm can arrive
I feel like a kid on xmas eve :laugh: prolly won't sleep a wink tonight.
Thanks I'll let you all know how it goes tomorrow night!
Tom