Topic: WRONG Piston Rings - 750F - What pistons do I have??? URGENT

[Mandic]

Sorry to capitalize and all but I am up a creek without a paddle right now.  I am moving to Texas next Monday and my bike is in a hundred pieces, now I find I have the wrong piston rings and cannot put it back together!

My bike is a 77 CB750F.  I got the part number for Total Seal rings from this post: http://forums.sohc4.net/index.php?topic=36531.0  Got a set and just spent a couple hours file fitting them(took way longer than it should have).  Well I should have checked piston fit first.  They DON'T!

My piston ring lands measure 1.2mm.  According to the above post and everything I can find for the 77F they should be 1.5mm.  The rings that Total Seal sent me are 1.5/1.5/2.8 as listed in that post.  However my rings are 1.2/1.2/2.8. 

Do I have oddball pistons? They are marked with "Honda" cast into them. 

I cannot afford any delays and this is a huge one.  I should have had this engine back together last week but due to bad weather UPS didn't deliver some parts until today.  Kind of freaking out about this now.  Of course on disassembly one of the 2nd groove rings broke, so I cannot reuse the old rings.

All my measurements were taken with a cheapy set of digital calipers but the rings CLEARLY don't fit into the piston lands and there is no grime built up in them.

[Mandic]

Sigh, looking at Total Seal's catalog they even list the proper measurements(though improperly).  I guess that thread that everyone looks to is in fact wrong.

http://www.goodvibesracing.com/Catalogs/TOTALSEALCATALOG.pdf

If you look at page 76 of the Total Seal catalog, it lists the 750F as 1.0/1.2/2.8 rings.  Which would fit my pistons perfectly.  

Basically, DO NOT go off of the post I listed in my first entry.  1.5/1.5/2.8 is NOT right and the part number for the Total Seal kit is for 1.5/1.5/2.8 rings.

EDIT: As I look at the catalog further it would seem the listing for 1.0/1.2/2.8 rings is for 3.0 over pistons made by Wiseco or JE.  But mine are standard size 61mm pistons.  SO I am confused every which way right now.

Learn from my mistakes I guess.  Now to see if I can get my pistons regrooved in a day, HA...