Thread: Big bore head gaskets
11-06-2006, 07:33 PM #1
Big bore head gaskets
Those of you who are running over 1300cc, what are you using for head gaskets?
11-06-2006, 08:29 PM #2
if you want a gasket made just call up cometix or something like that, they make any gasket you want to any thickness you want..
11-06-2006, 08:50 PM #3
Thanks Shooter. Good to know info. I have used Cometic gaskets in the past with zero problems.
11-06-2006, 08:58 PM #4
custom head gaskets
Here is some information for future reference if anyone does a search
Cometic Gasket, Inc.
8090 Auburn Road
Concord, OH 44077
(800) 752-9850Call Toll Free
(440) 354-0777Order / Tech Line
11-06-2006, 09:56 PM #5
Harry Klemm at GroupK also sells the 1390 head gasket.
11-07-2006, 10:24 AM #6
use a stock gasket opened up with a sanding wheel/drum. start with a 50-80 grit to rough opening, then 120 grit to fine tune the opening.
on the standard gasket there is fabrication rings in the teflon coating that can be used as guides (very slight marks that can be seen close up)
1200 gasket is good to 87mm
1300 gasket is good to anything that is currently available to the general public.
if you needed to use a single shim to obtain the correct squish i would use a 1300 gasket as a single shim on 1200 OR 1300 cylinders. over 87mm you need to use both 1300 shims to seal properly.
use the gaskets dry as they come from yamaha.
DO NOT RE-USE THESE GASKETS. it is a one time use only.
11-07-2006, 07:52 PM #7
- Join Date
- Aug 2005
I know the water jacket is a little differant - but a lot of us have gotten by just fine using OEM 1300 gaskets on 1200 bored cylinders for a long time now (3+ years).
11-09-2006, 12:54 AM #8
11-09-2006, 09:02 AM #9
Wait a second!
J-me, youre running over 1300cc's and you wanted to race my little old raider this past weekend?
11-09-2006, 08:04 PM #10
I am not running a BB 65U, however I have a set of cylinders that can go to 87+. Finding off the shelf pistons is going to be a problem though.
BTW, nice numbers last weekend!
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