Topic: help is there any diffrents from stock head gaskit and big bore one

[fastsmoker]

i have my cb 750 almost ready to slap back together i just needed one ex. valve so i thought i would get one off this other motor i have  thats when ican see the diffrence in the clinders didnt know it befor but my bike has a big bore kit on it and with this being my first i dont know that much about the bike what im getting at is i all ready bought a gaskit kit for it but do i now have to find big bore head gaskit for it to

[scondon]

Yes.  Most common overbore is 836 kit(65mm). Head gasket available from Cometic. Measure your bore in mm and tell us what you have.

[fastsmoker]

i think its 64mm if im reading it right

[Jerry Rxman Griffin aka MuthaF'er]

The big bore gasket is listed as fitting 810 to 836. This one size is used for all these: 810/64mm, 823/64.5mm, 836/65mm.

[fastsmoker]

thanks i think i got it i need to get big bore head and base gaskits.
ok now witch ones should i get and what thickness should thay be
thanks

[scondon]

Here's Cometic's home page w/1-800 #.

http://www.cometic.com/

Here's Dynoman's listing of the head gasket(first on the list)

http://dynoman.net/bikepages/sohc/gaskets.html

   What you need is the Cometic head gasket identified as "CFM-20". Shop around for best price. You will use the base gasket that came in your stock gasket kit since the outer diameter of your sleeves has not changed, just the inner bore.