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DT1-250 1968 Connecting Rod Length?

13 Aug 2019 16:24
bart.ives
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DT1-250 1968 Connecting Rod Length? #1
I ordered this 125mm connecting Rod with 24mm crank pin kit off ebay. Of course this was before I split the cases finding out that mine is 130mm. Can the shorter connecting rod be used? I expect if I do it will be low on power. I have contacted the seller to see if he has one to swap for a longer one, preferred.

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13 Aug 2019 18:26
RT325
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DT1-250 1968 Connecting Rod Length? #2
Yep just measured my 214 rod which is DT1 & 130mm. So no easy answer--well there is & that's get the right rod. I overcame that problem by fitting a 360 crank which is 6mm longer stroke. I'd better not give you bad ideas as i did it on purpose to make a 280 or whatever it ended up as. Could tell you plenty of other bad ideas too but not now.
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13 Aug 2019 18:37
bart.ives
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DT1-250 1968 Connecting Rod Length? #3
RT325, Thanks for the quick feedback and the measurement on your 214 rod. Confirms I will need to get one that is 130mm length with bearing to fit 24mm pin. Will have to give this more thought and research.

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13 Aug 2019 19:31
RT325
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DT1-250 1968 Connecting Rod Length? #4
Just hold that thought for a minute as i see on partzilla they call the pin 214 part number & the rod 431 but maybe its an updated number. I'm sure i'm right . mine's 130mm & has 214 number. Most of my stuff is DT1.

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13 Aug 2019 20:02
MarkT
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DT1-250 1968 Connecting Rod Length? #5
From what Enduronut has said on here, the 214 and 431 rods are 130mm. If you want to use your stock piston port cylinder you'll need the longer 130mm rod.

If you wanted to swap the top end for a reed valve DT2/DT3 type, I'm pretty sure you would need to swap to the shorter 125mm rod. (I'm not sure why Yamaha changed the rod length on the 250's when they went to reed valve, but they did)

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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13 Aug 2019 20:14
RT325
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DT1-250 1968 Connecting Rod Length? #6
I giveup--for now. But i'm sure i'm right & the 214 rod i have is 130mm. Pretty sure 360's used the same rod but with a 25mm pin & smaller rollers so it all works out. number seems to have become 431 now. Others on here will know.

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14 Aug 2019 11:12
bart.ives
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DT1-250 1968 Connecting Rod Length? #7
I contacted Chuck at BikeBuzzard where I purchased the Rod and he said he could exchange the 125mm connecting rod for a 130mm rod. Put the short rod back in the mail to him this morning, sent him tracking info et.al. This is Chuck's response: "Ok - I should be sending the 130mm rod out before that one comes back.... then that bike should be fine until the year 2040?" Will post follow up when I get the 130mm rod.

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