Author Topic: Trying to find port timing diagram for a DT1MX.  (Read 595 times)

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Offline John Orchard

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Trying to find port timing diagram for a DT1MX.
« on: February 27, 2019, 07:05:15 PM »
I'm still having no luck finding a port timing diagram for a Yam DT1MX, could anyone give me any leads please  :-)  TIA
Johnny O - Tahition_Red factory rider.

Offline sleepy

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Re: Trying to find port timing diagram for a DT1MX.
« Reply #1 on: February 28, 2019, 11:41:30 AM »
Got a un-molested GYT barrel here I could probably messure if it would help.

Offline John Orchard

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Re: Trying to find port timing diagram for a DT1MX.
« Reply #2 on: March 01, 2019, 09:48:44 AM »
That would be very interesting to a few l think, if you get the chance? Thanks. Do you want to sell it? :-)
Johnny O - Tahition_Red factory rider.

Offline sleepy

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Re: Trying to find port timing diagram for a DT1MX.
« Reply #3 on: March 01, 2019, 10:43:34 AM »
No not for sale at them moment as I had a plan to put together a replica of a bike I had as a teenager. I'll have to get someone who hasn't just had back surgery to climb up the ladder to my mezzanine to get the barrel before I can measure but my son should be over this weekend.

Actually got 2 off them but one has had a cast iron sleeve that I fitted to it and has been sold to go on vintage racer.

Offline JC

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Re: Trying to find port timing diagram for a DT1MX.
« Reply #4 on: April 10, 2019, 03:37:02 PM »
John, if you're still looking for DT1M specs I have an article listing hts x widths as follows

EX 39x46

Trans 51x31/17.5

In 100x45 (to bottom)
     (75 to top of port)

When I had a DT1M cylinder I measured as follows

Ex 36.5
Tr 51
In 99 bottom, 76.5 top