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Late model pistons in '72 DT2

23 Aug 2015 19:25
mulletjocks
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Late model pistons in '72 DT2 #1
Hello everybody. I had a quick search through this Twinshock group and couldnt find what i was after.

Recently a seller on Fleabay got me all gooey when he suggest in his add that '77 pistons and rings would work with DT's all the way back to my DT2. He also mentioned the later piston having the extra Keystone ringset as a big benefit.

All this sounded ok so far, but i wanted to know if anyone here has experience chopping and changing pistons combo's in these lovely little stinkwheels?

Cheers
Dylan.

with a little help from the "shift" key, 4 Stroke becomes $ Stroke

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23 Aug 2015 20:25
Makotosun
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Late model pistons in '72 DT2 #2
There can be a lot of crossover on the pistons. The best place to get good information is to send a message to Enduronut who is our resident piston expert.

yamaha-enduros.com/index.php/my-own-profile/988-enduronut

IF it isn't one thing, it's another.

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23 Aug 2015 20:26 23 Aug 2015 20:43 by mulletjocks.
mulletjocks
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Late model pistons in '72 DT2 #3
Cheers, I will report back with my findings


edit;

here is the message i sent to Enduronut, and in case he comes looking i will post up the original Ebay Add that got my attention

mulletjocks wrote: Hello there Enduronut.

Dylan from Australia here. Im rebuilding my first two stroke and it happens to be a '72 DT2.
I asked the question about late model pistons and compatibility with the earlier DT2 and was pointed in your direction for clarification.

Makotosun

"There can be a lot of crossover on the pistons. The best place to get good information is to send a message to Enduronut who is our resident piston expert."

The add that got me thinking reads like this;

"BRAND NEW OLD STOCK / OEM NOS ITEM
Yamaha Piston and Ring Set STD Part Number 2N6-11610-00-00 & 2N6-11631-01-96

Fits The Following Models: Made for 1979 DT250F

Mechanically also will work on the below models: 1972-73 DT2 DT3
Difference this had has keystone rings on top and bottom. So really this is a much better set up ."

Curious as to your thoughts!

Cheers,
Dylan Atkins


and the add:


with a little help from the "shift" key, 4 Stroke becomes $ Stroke

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25 Aug 2015 11:41
Enduronut
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Late model pistons in '72 DT2 #4
.

Yes indeed, the later DT250 pistons will also work in your DT2

.

.

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25 Aug 2015 15:10 26 Aug 2015 22:00 by mulletjocks.
mulletjocks
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Late model pistons in '72 DT2 #5
Cheers. This I good to know, I will go ahead a buy a set.
Any traps in particular to look out for?




After measuring my bore I have found, much to my surprise, that is it still on standard bore, and with no large scores or scratches I went ahead and got myself a 0.25mm Over set. Happy days.

with a little help from the "shift" key, 4 Stroke becomes $ Stroke

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14 Nov 2019 12:25
nutt
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Late model pistons in '72 DT2 #6
My DT2 had a wiseco +6 piston in it, pretty fresh with a good bore but they never deburred the cylinder. I had the same concerns as you so I called Wiseco and their tech assured me the big window piston was correct down to '72. 3 thou was the spec'd clearance but mine measured 4 at the top and 5 at the bottom, possibly reversed that, can't remember now. The guy that honed it for me said it'd be fine, just let it warm up. The next bore would have been +8 and I didn't want to go there along with a fresh piston. Same as you, I thought I'd run it and if the noise bugged me, I'd search for a new cylinder since mine does have a couple bent fins.

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