facebook1 youtube1 twitter1 instagram linkedin1 pinterest1

NOTICE:  If you are not a free registered member of the site, you will not see the photos in the forum, and you won't be able to access our premium member content. Please consider joining our community! REGISTER AND MAKE THIS BOX DISAPPEAR!

×

Pictures Posting Not Working (12 Jun 2023)

Picture uploads is again unavailable. We are working on the problem. Thanks for your patience.

Makotosun

New to me RT1 with an identity problem

  • Keltanf
  • Keltanf's Avatar Topic Author
  • Offline
  • Junior Member
  • Junior Member
  • Posts: 16
  • Likes received: 3

Replied by Keltanf on topic New to me RT1 with an identity problem

Thanks for the info! I just looked it up and you were right, I had no clue the ‘70 didn’t come with a decomp.

How do you distinguish a MX head from a stock head? 

Anyhow, I’ve got a tank on its way so I should have the bike running good next weekend!
03 Dec 2022 16:02 #21

Please Log in or Create an account to join the conversation.

  • Posts: 13591
  • Likes received: 9431

Replied by MarkT on topic New to me RT1 with an identity problem

If it's a JDM, which it likely could be, it may have had a decomp in 1970... As was already said JDM models often got key features the year before the US 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
The following user(s) Liked this Post: Keltanf
03 Dec 2022 16:07 #22

Please Log in or Create an account to join the conversation.

  • Posts: 13591
  • Likes received: 9431

Replied by MarkT on topic New to me RT1 with an identity problem

Here's another thread on a similar JDM model. yamaha-enduros.com/index.php/forums/1968...ifying-rt1-jdm#43318
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
The following user(s) Liked this Post: Keltanf
03 Dec 2022 16:14 #23

Please Log in or Create an account to join the conversation.

  • Posts: 13591
  • Likes received: 9431

Replied by MarkT on topic New to me RT1 with an identity problem

Note the longer seat than we got in the US and the passenger grab strap on the JDM model at that link...  both were requirements in Japan.

Also note your bike and the other JDM one in the linked thread have a steering lock...  those didn't show up in the US on the RT until the 1973 model year if I remember correctly. 
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
The following user(s) Liked this Post: Keltanf
03 Dec 2022 16:19 #24

Please Log in or Create an account to join the conversation.

  • YamahaForumUsername
  • YamahaForumUsername's Avatar
  • Offline
  • Premium Member
  • Premium Member
  • Posts: 62
  • Likes received: 38

Replied by YamahaForumUsername on topic New to me RT1 with an identity problem

Hope this is easier to understand. about the image embedding.

This image is hidden for guests.
Please log in or register to see it.

This image is hidden for guests.
Please log in or register to see it.

The following user(s) Liked this Post: MarkT, Keltanf
03 Dec 2022 18:25 #25

Please Log in or Create an account to join the conversation.

  • Posts: 92
  • Likes received: 68

Replied by yamayeeha on topic New to me RT1 with an identity problem

Mx head - plugs point slightly forward, where as standard head plugs point backwards.
The following user(s) Liked this Post: Keltanf
04 Dec 2022 14:28 #26

Please Log in or Create an account to join the conversation.

  • Posts: 9842
  • Likes received: 4026

Replied by RT325 on topic New to me RT1 with an identity problem

I tried an MX head on my DT1 once but made it too harsh--squeezed comp[ression too hard & accentuated piston rattle clearance so gave up on that idea. Come to think of it i 'did' run an MX head on my DT2 running on methanol but std porting & went very well with a race chamber & a GYT kit carb or a 360 carb. But was a new DT2 so tight piston clearance not horse & cart clearance like my DT1.
The following user(s) Liked this Post: Keltanf
Last edit: 04 Dec 2022 14:39 by RT325.
04 Dec 2022 14:38 #27

Please Log in or Create an account to join the conversation.

  • Keltanf
  • Keltanf's Avatar Topic Author
  • Offline
  • Junior Member
  • Junior Member
  • Posts: 16
  • Likes received: 3

Replied by Keltanf on topic New to me RT1 with an identity problem

Thanks Markt for the link to that other JDM bike! And thank you Yamayeeha for the info on the MX head. That’s very interesting!

I grabbed my seat pan this evening and checked it with that bike as well as US model RT1’s and I’ve got a longer JDM seat pan!
Last edit: 04 Dec 2022 18:27 by Keltanf.
04 Dec 2022 18:25 #28

Please Log in or Create an account to join the conversation.

  • Posts: 47
  • Likes received: 35

Replied by Mark350 on topic New to me RT1 with an identity problem

In 1972 I bolted an MX head (#284) on my RT-1B with no issues. Was a bit harder to kick thru but it did have quite a bit more torque and pulled harder.

The issue with the shifter/foot brake reversal is very odd. Moving the shifter to the right is easy with the correct lever but moving the foot brake lever to the left side requires some type of frame attachment . I believe the '68 DT-1 had provisions for the brake lever swap, ( tabs welded on the lower frame tubes), at least that is what seems where such a lever could be attached. A picture is posted of a right foot brake lever mechanism somewhere in the Forum, as I had asked this question some months ago. What is odd is later year 250/360's had the shifter shaft on both sides, but the frames for these bikes do not have frame tab provisions for attaching a right brake pedal assembly, my RT1B included.

As an aside, I noticed my 1970 CT1B has similar frame tabs like those on the DT-1, maybe to mount a right brake too, but then there is no shifter shaft provision to move the shift lever to the left. Maybe on the CT1 the tabs were intended for a center stand?
12 Dec 2022 19:05 #29

Please Log in or Create an account to join the conversation.

  • Posts: 47
  • Likes received: 35

Replied by Mark350 on topic New to me RT1 with an identity problem

TYPO, meant to say ....but the frames for these bikes do not have frame tab provisions for attaching a LEFT brake pedal assembly, my RT1B included....
12 Dec 2022 19:08 #30

Please Log in or Create an account to join the conversation.

Moderators: yamadminMakotosunDEETVinnieJames Hart