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!

1974 DT100A Restoration

  • Posts: 327
  • Likes received: 229

Replied by Lizeec on topic 1974 DT100A Restoration

No apologies needed, I too sometimes go down the rabbit hole and start ordering parts in hopes of making it like new again, sometimes I can’t get original oem items and order aftermarket only to find out I am better off trying to make what I had in my hands in the beginning are better quality in both appearance and functionality. Either way I am sure you will have a fine running machine in the end.

 
11 Jan 2022 20:04 #61

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

  • imagelessJAKE
  • imagelessJAKE's Avatar Topic Author
  • Offline
  • Site Supporter
  • Site Supporter
  • Posts: 78
  • Likes received: 46

Replied by imagelessJAKE on topic 1974 DT100A Restoration

Cracked open the engine today - some slight metallic sludge in the bottom but nothing too terrible.

Although I suspect I am not the first poking around in here due to the stripped heads on the bolts and awful RTV gasket  

Gears look to be in good shape - should be changing the crank bearings tomorrow and sealing it back up.

Found a Wiseco piston kit thats 1mm over I am considering - plus we have alot of nearby shops will bore the cylinder out.


 

   

 
'68 Yamaha DT1 250
'73 Honda CB350
'74 Yamaha DT100
'86 Yamaha FJ1200
'89 Honda Hawk GT
'17 Yamaha FZ07
The following user(s) Liked this Post: adguy2112
Last edit: 14 Jan 2022 20:34 by imagelessJAKE.
14 Jan 2022 18:23 #62

This message has attachments images.
Please log in or register to see it.

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

  • Posts: 11768
  • Likes received: 6969

Replied by MarkT on topic 1974 DT100A Restoration

Bore as little as possible...  going straight to 1mm over is a mistake in my experience.  Liner gets thin and port timings change = less power. 
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: Schu, Ht1kid, msavitt
14 Jan 2022 22:23 #63

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

  • imagelessJAKE
  • imagelessJAKE's Avatar Topic Author
  • Offline
  • Site Supporter
  • Site Supporter
  • Posts: 78
  • Likes received: 46

Replied by imagelessJAKE on topic 1974 DT100A Restoration

"bore as little as possible" - Advice taken!

Some Updates:

New crank bearings in, new transmission bearings installed, transmission rebuilt, cases sealed.

The engine was rebuilt using the PDF guide online and parts fiche's.

After sealing the cases back up the engine shifts through all gears and rolls smooth as silk and the crank has no play. 

  

Cylinder is out getting bored to 2nd over +.50mm - plus found a matching OEM Piston and rings for it

 

Got the seat back from the upholsterers and its beautiful! New foam and new leather.

  


Powdercoating and Cylinder should come back within the week - very excited!

 
'68 Yamaha DT1 250
'73 Honda CB350
'74 Yamaha DT100
'86 Yamaha FJ1200
'89 Honda Hawk GT
'17 Yamaha FZ07
The following user(s) Liked this Post: MarkT, Quartermaster35, Sneezles61, adguy2112, Mike P
26 Jan 2022 11:22 #64

This message has attachments images.
Please log in or register to see it.

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

  • imagelessJAKE
  • imagelessJAKE's Avatar Topic Author
  • Offline
  • Site Supporter
  • Site Supporter
  • Posts: 78
  • Likes received: 46

Replied by imagelessJAKE on topic 1974 DT100A Restoration

Got the cases sandblasted and powdercoated and they finally arrived today! 

Came out perfect! there are some slight imperfections in the cases that came through but that doesnt bother me much.



  
 
'68 Yamaha DT1 250
'73 Honda CB350
'74 Yamaha DT100
'86 Yamaha FJ1200
'89 Honda Hawk GT
'17 Yamaha FZ07
The following user(s) Liked this Post: Schu, adguy2112
27 Jan 2022 15:34 #65

This message has an attachment image.
Please log in or register to see it.

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

  • imagelessJAKE
  • imagelessJAKE's Avatar Topic Author
  • Offline
  • Site Supporter
  • Site Supporter
  • Posts: 78
  • Likes received: 46

Replied by imagelessJAKE on topic 1974 DT100A Restoration

Big update:

Tank has officially been painted - waiting on clear to come in but such is life.
  
 


also painted the lettering on the cases.
 

Question:
Do the replica decals need to be clear coated over?
'68 Yamaha DT1 250
'73 Honda CB350
'74 Yamaha DT100
'86 Yamaha FJ1200
'89 Honda Hawk GT
'17 Yamaha FZ07
05 Feb 2022 14:47 #66

This message has attachments images.
Please log in or register to see it.

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

  • Posts: 478
  • Likes received: 294

Replied by adguy2112 on topic 1974 DT100A Restoration

Yes but don’t put them on too soon and very, very light first coat just to seal the decal from the solvents in the clear which can ruin the decals. I think the exception is the fender stripe which I don’t think gets a clear coat, incidentally, if you’re using Spray Max 2K make sure to activate the hardener from the bottom of the can. This idiot didn’t read the directions on one occasion. Apparently this occurs all the time. 
05 Feb 2022 21:32 #67

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

  • imagelessJAKE
  • imagelessJAKE's Avatar Topic Author
  • Offline
  • Site Supporter
  • Site Supporter
  • Posts: 78
  • Likes received: 46

Replied by imagelessJAKE on topic 1974 DT100A Restoration

slowly but surely coming together!

 

should get the cylinder back sometime this week and we can really get this show on the road.
'68 Yamaha DT1 250
'73 Honda CB350
'74 Yamaha DT100
'86 Yamaha FJ1200
'89 Honda Hawk GT
'17 Yamaha FZ07
The following user(s) Liked this Post: Mike P
09 Feb 2022 18:23 #68

This message has an attachment image.
Please log in or register to see it.

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

  • Posts: 478
  • Likes received: 294

Replied by adguy2112 on topic 1974 DT100A Restoration

I gotta say I like that shop. Given I’m working in my tiny house ADU any real shop would be an improvement but that looks like a great place to tinker. 
The following user(s) Liked this Post: Mike P
09 Feb 2022 21:26 #69

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

  • Posts: 1019
  • Likes received: 1075

Replied by darinm on topic 1974 DT100A Restoration

What a transformation, it's looking great. I love the tanks for that year too.
1972 Yamaha CT2 175
1972 Suzuki TS185 Sierra
1986 Yamaha IT200
2013 Yamaha XT250
10 Feb 2022 11:35 #70

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

Moderators: yamadminEnduronutMakotosunDEETVinnieDevinJames Hart