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Yamaha 7ET Cylinder Casting

 
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Dave Malloy



Joined: 18 Jul 2001
Posts: 675

PostPosted: Wed Aug 29, 2007 2:27 pm    Post subject: Yamaha 7ET Cylinder Casting Reply with quote

Has anyone heard of 7ET on a Yamaha KT100 cylinder boss, instead of 787? The other side has Y4 and the serial number is 7YK-300xxx. It's not one of the serial number ranges on the Muller Machine list. The WKA rule clearly states Y3 or Y4 on one boss AND 787 on the other to be legal, so this must not be legal. Thanks.
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dave morrison



Joined: 04 Sep 2002
Posts: 48
Location: United States, Texas, murphy

PostPosted: Sun Sep 16, 2007 8:37 pm    Post subject: Reply with quote

I had a couple of yamaha's with 7ET markings, they were ex-JICA
motors from the UK. I sold one to a guy at our club, it runs as good as
all the other 787 stamped motors there

Dave.
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Dave Malloy



Joined: 18 Jul 2001
Posts: 675

PostPosted: Mon Sep 17, 2007 6:39 am    Post subject: Reply with quote

What class did the club allow it to race in? It shouldn't be legal in a class calling for a 787 cylinder.
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dave morrison



Joined: 04 Sep 2002
Posts: 48
Location: United States, Texas, murphy

PostPosted: Mon Sep 17, 2007 7:08 am    Post subject: Reply with quote

Yamaha heavy class. I don't think I've ever seen the class teched
apart from a safety inspection. Like I said the motor isn't noticably faster
- or slower than anything else out there

Dave.
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Andersen Venturini



Joined: 27 May 2011
Posts: 40

PostPosted: Thu Jun 13, 2013 10:47 am    Post subject: Reply with quote

sorry to jump on this old post but I have got an engine like that and not sure if worth to blueprint it and be DQ. I just race club events.
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Walt Gifford



Joined: 19 Jul 2002
Posts: 4390
Location: United States, South Jerrrsey,

PostPosted: Fri Jun 14, 2013 7:13 pm    Post subject: Reply with quote

Just round off the E and the last T it'll look like 787.
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Rob Kozakowski



Joined: 05 Apr 2010
Posts: 321
Location: Canada, Alberta, Edmonton

PostPosted: Tue Jun 18, 2013 11:01 am    Post subject: Reply with quote

If it's for club racing, I'd suggest you ask and see what they say. If I had any say at the club, I'd let it go as long as everyone was made aware of it. The key being that you let people know in advance. For club racing, common sense should hopefully prevail over a rule like that.

I wouldn't use it if it's for "real" WKA racing.
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