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  #11  
Old 09-05-2011, 07:47 AM
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reliant doesn't have the .051 gasket, didn't pan out fuel moto either.
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  #12  
Old 09-05-2011, 07:54 AM
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Originally Posted by djl View Post
Not sure why you want to run a .051" head gasket but Cometic sell an MLS piece and you can get the SEs from Zanottis.
easy way to take a little compression out. the reason i need the set is i melted my front piston. hot day here in cali running pump gas with between 10.7 - 11:1 compression. found out the hard way that when you use a gas station with one hose for all three grades there is up to 1 gallon of 87 octane. was out in the country so couldn't get any octane boost. anyway good excuse to go from 95 to 98 inch
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  #13  
Old 09-05-2011, 08:20 AM
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Give Steve Pool a call at Automotive Machine & Supply a call. They handle Cyco gaskets, http://www.automotivemachine.com/ind...d=46&Itemid=53. He might be able to hook you up.
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Last edited by Weevil; 09-05-2011 at 08:45 AM..
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  #14  
Old 09-05-2011, 09:50 AM
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Well if you put a thicker gasket wont it compound the problem by creating less quench and spark knocking easier? Also its going to be harder to melt the front piston then the rear. How do your plugs look?
It just seems weird the front piton melted. Sounds like your running lean.
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Last edited by N-gin; 09-05-2011 at 02:28 PM.. Reason: Spelling
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  #15  
Old 09-05-2011, 01:40 PM
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Quote:
Originally Posted by nsodpty52 View Post
easy way to take a little compression out. the reason i need the set is i melted my front piston. hot day here in cali running pump gas with between 10.7 - 11:1 compression. found out the hard way that when you use a gas station with one hose for all three grades there is up to 1 gallon of 87 octane. was out in the country so couldn't get any octane boost. anyway good excuse to go from 95 to 98 inch
JMHO but a .051 head gasket is not a good idea; there is a reason why you are having trouble finding one. You will create a detonation situation which will damage another set of pistons which I suspect is what happened to the first set. That one gallon of 87 octane did not melt the front piston. FYI, the rear cylinder always runs hotter than the front, so heat is not the issue.

What cams are you running and what fuel management system? Increasing the bore will exascerbate the situation and, all other things being equal, will increase compression; not what you want to do.

Call JE, CP, Wiseco and see if you can find a dished piston and drop your compression; you may also need to change cams and/or open up the combustion chambers. Some combination of those changes will resolve the compression issue. Use the BigBoyq compression calculator and find a combination of chamber and piston dome volume (negative number) that will set your corrected compression at about 9.3 and cranking compression less than 190psi. If you can't find a combination that works or a piston with the right dome volume you will need to look at replacing the cams.

BTW, you don't need to go through AMS for CYCO gaksets; call John Murphy direct at 800-777-6974 between 9-5 EST; he will sell direct to you. He may ask if you are a shop but just tell him you are a hobbyist, do your own work and also work on bikes that belong to your club, friends and/or family. However, I can tell you that they don't have a .051 head gasket and you don't want to do that anyway. Frying pan to the fire.

Last edited by djl; 09-05-2011 at 01:45 PM..
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  #16  
Old 09-05-2011, 02:27 PM
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I just think he needs more fuel.
I run 205 CCPand 49 degrees of timing with cast pistons in 95 degree heat with no problems. It has been said over and over it all on the tune.
One problem that I ran into with doing my v-tune was my front cylinder would always tune to the lean side and my rear to the rich side. I had to manually tune it looking at spark plug color and flame color during running and at different cruising speeds.
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  #17  
Old 09-05-2011, 05:07 PM
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Quote:
Originally Posted by N-gin View Post
I just think he needs more fuel.
I run 205 CCPand 49 degrees of timing with cast pistons in 95 degree heat with no problems. It has been said over and over it all on the tune.

Agree on the importance of the tune but I doubt that adding fuel will solve the melting piston problem. The OPs sig says 10.5 but in his last post he says compression is between 10.7 and 11.2. So, until we have the build details, i.e., chamber volume, piston dome volume, head gasket thickness and deck height, we don't know what the true compression ratio is. You can run 205CCP and 49 degrees of timing but if she is detonating, you will burn up a piston. Personally, I wouldn't et up a touring build at more than 190psi; bar hopper or a motor that sees a couple of thousand miles a year, OK but not on a high mileage, long haul touring bike; just asking to get stranded somewhere. JMHO
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  #18  
Old 09-05-2011, 05:14 PM
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Just stack 2).030 cometec gaskets and sand your head .010!
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  #19  
Old 09-05-2011, 05:49 PM
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Quote:
Originally Posted by djl View Post
The OPs sig says 10.5 but in his last post he says compression is between 10.7 and 11.2. So, until we have the build details, i.e., chamber volume, piston dome volume, head gasket thickness and deck height, we don't know what the true compression ratio is.
It is a big confusing. In his last post, he states that it's a good excuse to go from 95" to 98", yet in his signature, it says it's already a 98. Click the image to open in full size.
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  #20  
Old 09-05-2011, 09:05 PM
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Quote:
Originally Posted by DD&Weevil View Post
It is a bit confusing. In his last post, he states that it's a good excuse to go from 95" to 98", yet in his signature, it says it's already a 98. Click the image to open in full size.
Right, I missed that little detail. If we can get all the details we might be able to help. Whatever the details, a .051" head gasket is not a solution.
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Old 09-05-2011, 09:05 PM
 
 
 
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