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Makotosun

Re:1968 DT1

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Replied by Swoop56 on topic 1968 DT1

In regard to 2/4 screw mag cover . I have a 69 with eng no in mid 23,000 , and it still has 2 screw cover . From other thread posts , I suspect that mine was pretty close to change over point .
29 Jul 2016 00:29 #111

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  • KennyandtheJets
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Replied by KennyandtheJets on topic 1968 DT1

Does anyone now what the turnover of DT1`s the factory was producing in one day?
When in doubt, power out !
29 Jul 2016 02:19 #112

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  • Winterwoods
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Replied by Winterwoods on topic 1968 DT1

~

Looking for a DT1 Connecting Rod.

A couple of questions, cause I-don't-know,
the answers.

1.) Do the DT1/RT1 use the same Connecting Rod?

2.) Is - Stroke, (as in Bore and Stroke), directly related
to Connecting Rod length - center to center ?

Thanks
c.winterwoods
Last edit: 26 Dec 2016 20:03 by Winterwoods.
26 Dec 2016 16:45 #113

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Replied by DEET on topic 1968 DT1

This information is assuming that we are talking about a DT1/RT1....

The stroke is different between the two. DT1=64mm, RT1=70mm

The connecting rod is the same length. It is a 214 type rod.

The stroke in this case is determined by the distance of the crank pin from the centerline of the crankshaft.
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Where the Yamaha Enduro is still a current model...
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26 Dec 2016 18:42 #114

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Replied by Winterwoods on topic 1968 DT1


...

"Ah so desu ka".




So the Cranks(DT1/RT1), are different, not-the-rod's lengths;
which explains the different Strokes(64mm/70mm).

c.winterwoods
Last edit: 26 Dec 2016 20:02 by Winterwoods.
26 Dec 2016 18:55 #115

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Replied by DEET on topic 1968 DT1

Aftermarket rods are available, but you have to find the right bearings.
It also depends on the diameter of your stock crank pin. (There were 2 sizes).

There are some 214 stamped rods still available, but they are expensive.
I may have 1 or 2 left.
But you are probably looking for cheap, so that wouldn't interest you.

Rod kits can be $100 to $200, but not all come with bearings that will work.
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Where the Yamaha Enduro is still a current model...
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26 Dec 2016 18:59 #116

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Replied by swm on topic 1968 DT1


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Replied by Winterwoods on topic 1968 DT1


~

...and that would be the way to know if you
have a DT1 or an RT1 Crank, correct ???

c.winterwoods
Last edit: 26 Dec 2016 20:03 by Winterwoods.
26 Dec 2016 19:14 #118

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Replied by pntrbl on topic 1968 DT1

I thought the RT's had a 5mm longer length than the DT's. I know on my RT1 I used a Royal rod kit for an 83 YZ250. Same length. The only hitch is the big end bearing has bigger rollers so you have to use the YZ bearing that came with it.

Got it on Amazon for a $100 and was very impressed with it. It's made using an alloy and processes that hadn't even been invented in 1971. Very light. Oil slots front and rear. Nice piece.
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27 Dec 2016 15:41 #119

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Replied by Ctune80 on topic 1968 DT1

pntrbl,
The DT1 used the same rod as the RT1,2,3 but the DT2,3 used a 5mm shorter rod after the change to reed valves. Not sure why Yamaha did this you would think just having to produce one rod would be more economical.
The Ox is slow, but the Earth is patient.....
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27 Dec 2016 17:38 #120

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