jaws12r
Novice Class
Posts: 45
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posted June 19, 2006 09:57 PM
 Edited By: jaws12r on 19 Jun 2006 23:03
wiseco 1272 in 1270 cylinder
please bear with my long story/question:
recently i bolt on a muzzys 1270 with muzzys cams(complete with the vsprings,retainers)+studs...after 3000miles a valve sung on the 3rd 1270 pistion..after checking out with muzzy.i order a piston(supose to be 1270) + welded crank to increase to 1375 set up.. yesterday i just discover the piston they send me is different...its the same size as 1270, but its different in length from the other 3 1270 old piston..my bike shop email muzzys they told me muzzys dont sell a 1270 piston,and ive to order 4....
QUESTION : do you think the wiseco 1272 piston will fit in the muzzys 1270cylinder(its in great condition) with my muzzy crank...is it 100% possible for this 1377cc set up.
the muzzys 60mm welded crank is new...other than that i have the muzzys cams,valve springs,retainers,ss valve (new from u guys)stud n nuts..what else i need?
  
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zxlnt
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted June 19, 2006 11:10 PM
Look at my post on pyschobike. If I were to guess, since you ordered a stroker crank you probably got a cut down 1270 piston. When you go with the stroker crank they cut the domes of the 1270 pistons to lower engine compression. If I were to guess that is..
Call them back and double check..
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jaws12r
Novice Class
Posts: 45
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posted June 19, 2006 11:14 PM
Edited By: jaws12r on 20 Jun 2006 00:35
the crank come with extra base gaskets and a spacer to lower the compression..for the 1270 upgrade 1375 kit .thats why he bought A replacement piston and the 1375 urgrade crank kit..but i guess muzzys send the 1375 piston instead..but now muzzy ask me to get all new 4 piston..thats why im looking at 1272cc for a cheaper replacement...
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zxlnt
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted June 19, 2006 11:35 PM
I would still double check the dome heights on the pistons and call Muzzys back..
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jaws12r
Novice Class
Posts: 45
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posted June 20, 2006 05:31 AM
Edited By: jaws12r on 20 Jun 2006 06:32
.
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park12r
Expert Class
Posts: 124
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posted June 20, 2006 07:24 AM
aperacing carry wiseco 1272....maybe you can try to ask them..
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ninja12
Needs a job
Posts: 3310
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posted June 20, 2006 11:07 AM
Edited By: ninja12 on 20 Jun 2006 12:11
Will NOT fit!
I tried it years ago. 
You will do better to find someone that has 3 1270 pistons that is willing to sell one.
Muzzy cuts the dome on the 1270 to lower compression on the 1361, probably what you got .
The wiesco 1272 piston looks like it will work until you try.
It will not even go into the hole.
It takes a minute to realize that these engines go or blow based on a few THOUSANTHs of an inch.
IT would be bigger than a 1377, the extra 2cc it has to be multiplied by the extra stroke.
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supra5677
Pro
Posts: 1279
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posted June 20, 2006 02:13 PM
i thought the muzzy 1270 kit was a 2.5mm bore 85.5mm exactly the same as 1272...
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matt sterbator
Pro
Hiding in the bushes
Posts: 1367
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posted June 20, 2006 02:25 PM
quote:
i thought the muzzy 1270 kit was a 2.5mm bore 85.5mm exactly the same as 1272...
Correcto ! The pistons, should, be the same diameter.
Muzzy's 1270 is *actually* 1272cc, kinda like the Carpenter 1290 is *actually* 1287cc
____________
Some day, you're going to run out of some days
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countersteer
Needs a job
Didn't read the owners manual
Posts: 2207
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posted June 20, 2006 03:41 PM
very interesting thread
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Scott
Long Island, New York
2006 ZX-14, 2003 ZX-12R
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osti33
Needs a job
Posts: 2973
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posted June 20, 2006 04:43 PM
I think the Muzzy 1270 pistons are 85.4mm not 85.5mm. You might want to check with Muzzy to be sure.
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted June 20, 2006 06:36 PM
Been there, done that. http://dontbescaredracing.com/photos/misc/pistons/
1270 shown left, 1361 shown right.
Oh and, YOU'RE WELCOME! 
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ninja12
Needs a job
Posts: 3310
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posted June 20, 2006 08:07 PM
quote:
quote:
i thought the muzzy 1270 kit was a 2.5mm bore 85.5mm exactly the same as 1272...
Correcto ! The pistons, should, be the same diameter.
Muzzy's 1270 is *actually* 1272cc, kinda like the Carpenter 1290 is *actually* 1287cc
They didn't fit in the hole for me!
Don't know if you don't believe me or you think your luck will be different.
Good luck.
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jaws12r
Novice Class
Posts: 45
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posted June 23, 2006 08:40 AM
Edited By: jaws12r on 23 Jun 2006 09:50
okie guys here are the pics
this is the older piston which came with my 1270 kit about 6 months back its says JE 984P
This is the NEW piston dat came with my upgrade kit it reads JE 944M
when placed together u can see a slight difference in the place where u insert the rods
there is also a difference in the grooves
Placed side by side there is also a difference in height
but in diameter they are the same the top are not re-machined in any way
HELP ME !
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matt sterbator
Pro
Hiding in the bushes
Posts: 1367
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posted June 24, 2006 09:23 AM
quote:
quote:
quote:
i thought the muzzy 1270 kit was a 2.5mm bore 85.5mm exactly the same as 1272...
Correcto ! The pistons, should, be the same diameter.
Muzzy's 1270 is *actually* 1272cc, kinda like the Carpenter 1290 is *actually* 1287cc
They didn't fit in the hole for me!
Don't know if you don't believe me or you think your luck will be different.
Good luck.
Heh, they *should* be the same diameter, but knowing Muzzy's, it's probably a little bit different so that you HAVE to buy the stuff from them.
____________
Some day, you're going to run out of some days
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park12r
Expert Class
Posts: 124
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posted June 24, 2006 12:08 PM
he bought A piston from muzzys for his 1375 upgrade kit.after a valve sang in his 3rd piston...but muzzys send him the wrong piston replacement..(we are in singapore the shipping aint cheap)
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stef12rr
Expert Class
Posts: 144
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posted November 08, 2006 02:22 PM
I guys i wonder if the weight are the same
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RA12R
Zone Head
Posts: 919
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posted November 13, 2006 06:06 PM
Muzzy's pistons are definitely NOT standard. They would be 2.4mm vs 2.5. Their cranks were also NOT standard at 4.6mm vs 5mm. Keeps you needing them only.
____________
All must bow to the "Ra Supremecy"...
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