[TR] Z-S Too Lean

[Chip19474 at aol.com]

Martin,
 
A couple of questions......is this a stock motor or has it been rebuilt  with 
engine mods like shaved head, faster camshaft, combustion chamber  profiling, 
etc?  I think the GT6 Mark 3 has later type ZS carbs with  adjustable needles 
like the later TR6 ZS carbs - are you turning the needle in  the correct 
direction to increase richness (turn clockwise to enrichen;  counterclockwise to 
lean).  
 
If you've modified your motor for higher performance, there's a good chance  
that the stock needles are not capable of providing enough of a fuel charge to 
 satisfy the increased compression, cam timing, etc.  The solution to that  
symptom is richer needles.
 
But, maybe the carb with the problem has a bad/worn needle.....take the  
damper piston and needle out and make sure the needle looks okay.  Double  check 
the diaphragm for proper fit and no hidden cracks.  Is the piston  moving up 
freely without binding?  Are you using the correct weight oil in  the damper 
chambers?  There's a lot of narrative on which oil to use in  these dampers...I 
prefer ATF but whatever you use will be useless if the damper  piston doesn't 
move freely!
 
Good luck,
 
Chip Krout
Delaware Valley Triumphs, Ltd.
Skippack, PA
1976 TR6  CF57822U
 
 
In a message dated 3/30/2009 3:50:48 P.M. Eastern Daylight Time,  
moira.secrest at verizon.net writes:

And yeah  the car runs like a pig up until about 2k rpm because I can't
get the  mixture right, the one adjuster is all the way  rich.

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