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RT1 Newb

  • Geiger
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Replied by Geiger on topic RT1 Newb

I had a look. According to CMSNL diagrammes the RT1 does have a compression valve. Also my engine number states 1970. However I seem to have a RT1B rear light unit. Regardless, the tacho cable drive is in the same position on both, and my measurement was only done with a piece of electrical flex so very approximate. If yours is off a RT1 it gives me an accurate measurement and I can start looking for a replacement from another Yam. Many thanks.
09 Apr 2021 03:45 #11

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Replied by Swoop56 on topic RT1 Newb

You can't absolutely rely on the microfishe images that parts suppliers
use . They often combine different years models but don't always
differentiate as to which model had updated parts .
I have a combined RT1/ RT1B parts book from back then .
The decompressor valve was only fitted on the RT1 B .
The RT1 had an advance mechanism on the ignition rotor ,
and  the spark was retarded for startup .
Two different ways to skin the cat .
09 Apr 2021 04:51 #12

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Replied by Geiger on topic RT1 Newb

Looks like I have a B model then.
09 Apr 2021 08:26 #13

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Replied by Geiger on topic RT1 Newb

Also, I wonder if anyone can give me any starting tips re the decompression lever / valve. Found one on internet but in Japanese.
09 Apr 2021 08:29 #14

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Replied by Gr8uncleal on topic RT1 Newb

Comparing the engine and frame numbers (if different) with the VIN tables should confirm what model(s) you have. Both numbers will have been the same originally.

Apologies if you have done all of this already!
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09 Apr 2021 08:45 #15

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Replied by Gr8uncleal on topic RT1 Newb

Are you going to use the original valve? If yes, have a look at the parts manual to see what you are missing and then have a look on fleabay.
Last edit: 09 Apr 2021 08:48 by Gr8uncleal.
09 Apr 2021 08:46 #16

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Replied by Geiger on topic RT1 Newb

Sorry if I misled. I have the original front decompression valve and lever etc. All I 'm missing is the rubber type cover. I just wondered if it is a simple as opening the valve before starting and then closing it once running.
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09 Apr 2021 12:37 #17

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Replied by Swoop56 on topic RT1 Newb

The starting procedure is indeed that simple .
Good luck finding a rubber cover , they are a rare item .
I'm a bit surprised no aftermarket rubber merchant has
repopped one .
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09 Apr 2021 14:28 #18

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Replied by Geiger on topic RT1 Newb

Now that would be good. I'm trying to find a source to see if they can be 3D printed.
09 Apr 2021 16:38 #19

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Replied by MarkT on topic RT1 Newb

The various manuals in the Tech Library explain the starting procedure and a lot of other good stuff! 

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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
09 Apr 2021 18:14 #20

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