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Stock valve drawing

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I've searched and can't seem to find the specs on the stock valves other than 4.5 diameter stem and 24 ex and 30 int  I would like to get my hands on a measurement spec sheet.

i don't have a head in my hands yet to pull one out of and measure it. And seems that no one has them to sell a set of aftermarket plus sized on the shelf. My Machinest asked for a "print" of the stock valves. 

Im doing a 283 BB kit that way he can sneak some larger valves in. 

Thanks 

this should give an idea of what I'm after 

IMG_5488.PNG

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http://parts.southernhonda.com/p/Honda_2014_CRF250L/Valve--exhaust/54991868/14721-KYJ-900.html?partner=googlebase_adwords&kwd=&origin=pla

 

first place I've seen with the stock valves for sale. intake is $6 and exhaust is $14. fairly cheap investment to hand your machinist something to go on.

edit:  on a re-look, looks like pretty much any OEM part place has them, under camshaft + valve diagram in the parts manual

intake is: 14711-kyj-900

exhaust is: 14721-kyj-900

Edited by Crapflinger

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On 5/19/2017 at 7:06 PM, KLeptoLee said:

I've searched and can't seem to find the specs on the stock valves other than 4.5 diameter stem and 24 ex and 30 int  I would like to get my hands on a measurement spec sheet.

i don't have a head in my hands yet to pull one out of and measure it. And seems that no one has them to sell a set of aftermarket plus sized on the shelf. My Machinest asked for a "print" of the stock valves. 

Im doing a 283 BB kit that way he can sneak some larger valves in. 

Thanks 

this should give an idea of what I'm after 

IMG_5488.PNG

 

You may want to send Barry a PM  .... he has already done this and is a master head builder ... :thumbsup:     https://www.thumpertalk.com/profile/186161-bigblockbarry/ 

 

there is also a ton of valuable information in this thread ....  

 

 

head.jpeg.5e9a469dfed4500a38ffe3b63ec3c9c6.jpeg

 

 

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On 5/24/2017 at 9:13 AM, gnath9 said:

 

You may want to send Barry a PM  .... he has already done this and is a master head builder ... :thumbsup:     https://www.thumpertalk.com/profile/186161-bigblockbarry/ 

 

there is also a ton of valuable information in this thread ....  

 

 

head.jpeg.5e9a469dfed4500a38ffe3b63ec3c9c6.jpeg

<img class="ipsImage ipsImage_thumbnailed" data-extension="core_Attachment" data-fileid="397421" src="https://www.thumpertalk.com/uploads/monthly_2017_05/head.jpeg.5e9a469dfed4500a38ffe3b63ec3c9c6.jpeg" alt="head.jpeg.5e9a469dfed4500a38ffe3b63ec3c9c6.jpeg" />

 

 

BigBlockBarry does really nice work. The big brown truck dropped it off today. It's really nice! 

 

 

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