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Author Topic: 1976 yz400 piston ?  (Read 7921 times)

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Offline ozyditcher

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1976 yz400 piston ?
« on: October 14, 2013, 05:08:36 pm »
Will a 1975 mx400 piston work in a 1976 yz400 .
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Offline motomaniac

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Re: 1976 yz400 piston ?
« Reply #1 on: October 14, 2013, 06:34:04 pm »
yes, same motor
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Offline ozyditcher

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Re: 1976 yz400 piston ?
« Reply #2 on: October 14, 2013, 11:28:02 pm »
Thanks.
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Offline Scootern29

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Re: 1976 yz400 piston ?
« Reply #3 on: October 15, 2013, 03:42:02 am »
There are two different rods in those motors, or so I was told.
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Offline ozyditcher

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Re: 1976 yz400 piston ?
« Reply #4 on: October 15, 2013, 05:43:08 pm »
piston pin the same size
?
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Offline Iain Cameron

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Re: 1976 yz400 piston ?
« Reply #5 on: October 15, 2013, 07:44:45 pm »
No same piston , rod and rings ,  75 mx400 - 76 IT400 -76 YZ400 -77 Yz400 - 77 IT400 Iain
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Yamaha tragic ; dt1, rt1, dt2, rt2, dt2mx , rt2mx , mx250, mx360,sc500, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 , dt100 , xr75 ko xr80 03 , it175 82 . Not a member of any club

Offline Scootern29

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Re: 1976 yz400 piston ?
« Reply #6 on: October 16, 2013, 05:52:02 am »
Hmmmm, that is a nice development.  :)
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Offline Iain Cameron

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Re: 1976 yz400 piston ?
« Reply #7 on: October 16, 2013, 11:54:47 pm »
one of Yamahas great motors pulls like a tractor will rev with a good pipe and almost bullet proof .
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Yamaha tragic ; dt1, rt1, dt2, rt2, dt2mx , rt2mx , mx250, mx360,sc500, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 , dt100 , xr75 ko xr80 03 , it175 82 . Not a member of any club

Offline ozyditcher

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Re: 1976 yz400 piston ?
« Reply #8 on: October 18, 2013, 10:17:23 am »
I got my piston today. Not the same, pin location is off.
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Offline Scootern29

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Re: 1976 yz400 piston ?
« Reply #9 on: October 20, 2013, 10:18:52 am »
That's what I was told by the Yamaha guys. I will see if I can find out the part #
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Offline Iain Cameron

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Re: 1976 yz400 piston ?
« Reply #10 on: October 20, 2013, 07:20:04 pm »
What is the piston gen Yam on the original and replacement or one a after mkt
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Yamaha tragic ; dt1, rt1, dt2, rt2, dt2mx , rt2mx , mx250, mx360,sc500, 74dt125, yzx125, yzc250, yzc400, yzd250, yzd400, yzh250, yzh80 , dt100 , xr75 ko xr80 03 , it175 82 . Not a member of any club

Offline Scootern29

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Re: 1976 yz400 piston ?
« Reply #11 on: October 21, 2013, 03:52:42 am »
I did a thread on yamahaenduro.com about the pistons on the 76 YZ 400. One of the guru's on there gave me the info on the two different rods in the motors. My motor has a 214 K rod in it which is the long rod. The superseded part number for the piston is 2k8-11636-00. Another thing I was told is that the piston for this rod should have 51004 or 51005 inside the skirt.

If the piston you have has 51000, 51002, 51003 inside the skirt, it is the other rod. They didn't give me the number on that rod unfortunately.

I was told the rod difference is 5mm and that is why they moved the piston pin location.

I hope this helps cause it had me confused also. I thought they would all be the same but I saw two different part numbers so that is why I asked.
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Offline motomaniac

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Re: 1976 yz400 piston ?
« Reply #12 on: October 21, 2013, 10:01:31 am »
Quote from: ozyditcher on October 18, 2013, 10:17:23 am
I got my piston today. Not the same, pin location is off.

Then its not 75/76 , they offset the gudgeon as a measure to help seizures on the exhaust port . No matter the motor runs the same with either
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Offline motomaniac

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Re: 1976 yz400 piston ?
« Reply #13 on: October 21, 2013, 10:03:00 am »
Quote from: Scootern29 on October 21, 2013, 03:52:42 am
I did a thread on yamahaenduro.com about the pistons on the 76 YZ 400. One of the guru's on there gave me the info on the two different rods in the motors. My motor has a 214 K rod in it which is the long rod. The superseded part number for the piston is 2k8-11636-00. Another thing I was told is that the piston for this rod should have 51004 or 51005 inside the skirt.

If the piston you have has 51000, 51002, 51003 inside the skirt, it is the other rod. They didn't give me the number on that rod unfortunately.

I was told the rod difference is 5mm and that is why they moved the piston pin location.

I hope this helps cause it had me confused also. I thought they would all be the same but I saw two different part numbers so that is why I asked.

They are all 130 mm , the longer rod came in 79
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Offline Scootern29

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Re: 1976 yz400 piston ?
« Reply #14 on: October 21, 2013, 10:48:58 am »
Uh OK. I was given the wrong info.  :)
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