YS 140L pistons??

[Peter Pennisi]

Thanks for this info Troy. You are a wealth of knowledge
 
 
Peter
 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Troy Newman
Sent: Saturday, 8 February 2003 11:25 AM
To: discussion
Subject: Re: YS 140L pistons??
 
This mod was originally holes on the top of the piston and extended down
to the ring groove behind the ring.....so that compression would cause
the ring to push out and seal better on the sleeve.
 
This mod was done for the 140L's....It works on all the 140's same
piston specs...even though there are several different generations of
the piston for the 140 they are all interchangeable. The DZ piston is
the best so far its very similar to the original YS 120 piston in that
has a full shirt and with some lightening hole work done but nothing
like the "L" piston. My suggestion to anyone buying anew piston is to
use the DZ piston....You won't get any of the rocking issues on the
previous and early versions of the "L" piston....
 
 
As for a performance increase with the gas porting (groove or holes) its
minor the big thing is that it helps save the pistons....On the other
hand the ring will not last as long...but a $20 ring is preferred over
the price of a new piston every time....considering if you replace the
piston you're probably going to do the ring also and maybe even the
cylinder.
 
I'm not sure if the DZ pistons have it gas ported or not.....I know I
have one that is and 2 pistons that are not. The DZ piston is the fix
for piston problems....If you want a little more of your "L" try the DZ
cam gear also.....It has a higher lift and longer duration that the "L"
cam gear.....changing the cam may make the L a little more barky and
give it a bit more kick but I'm sure it would increase power.
 
 
Troy Newman
 
----- Original Message -----
From: PENNISI Peter
Sent: Friday, February 07, 2003 6:18 PM
To: 'discussion at nsrca.org'
Subject: YS 140L pistons??
 

I believe there is a new style of piston available which has slots going
from the piston face to the ring groove. From what I understand this
aids in
better dynamic compression.

Has anyone used this piston in the YS140L?

Is there any significant power increase?

Thanks again

Peter

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