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

Crank seals and carb O-rings

  • Fozzy500
  • Fozzy500's Avatar Topic Author
  • Offline
  • Junior Member
  • Junior Member
  • Posts: 21
  • Likes received: 12

Crank seals and carb O-rings was created by Fozzy500

Hi
Just started work on my CT1C. First thing I noticed was the exhaust pipe was 'full' of oil and so was the crank case. Then found the cylinder base gasket was fitted back to front so now I'm worried about the rest!...... Anyway I'd like to ask about crank seal fitting - should the seals be pushed in as far as they will go or just till they are flush with the flange on the casting? I ask because the mag side seal seems to be in a long way and the clutch side seal isn't in at all! (See pics).

Also is the O-ring that goes on the bottom of the main tube of the CT1C carb the same part as used in the CT3 carb? I ask because Yambits UK sell the CT3 carb part but not the CT1C carb part, so I'm thinking they may be different. I have not been able to get a cross reference.
Thanks for any comments...
imgur.com/EFbYoTu
imgur.com/Nty4plZ

 
21 Feb 2024 04:29 #1

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

  • Gr8uncleal
  • Gr8uncleal's Avatar
  • Away
  • Site Supporter
  • Site Supporter
  • Posts: 4005
  • Likes received: 1943

Replied by Gr8uncleal on topic Crank seals and carb O-rings

Looking at an early (ie pre computerised) parts list for the CT1C, I would say not the same carb 'O' ring.

Yamaha still supply this new, so buy via your local dealer.
The following user(s) Liked this Post: Fozzy500
21 Feb 2024 05:35 #2

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

  • Fozzy500
  • Fozzy500's Avatar Topic Author
  • Offline
  • Junior Member
  • Junior Member
  • Posts: 21
  • Likes received: 12

Replied by Fozzy500 on topic Crank seals and carb O-rings

Thanks for that. I've ordered two...
21 Feb 2024 08:01 #3

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

  • Gr8uncleal
  • Gr8uncleal's Avatar
  • Away
  • Site Supporter
  • Site Supporter
  • Posts: 4005
  • Likes received: 1943

Replied by Gr8uncleal on topic Crank seals and carb O-rings

Just a minor fyi picture posting point, and that is if the BB function appears alongside an image on your Imgur account then, if you press the copy button alongside it and paste that in your post, then the images will actually appear on that post once you've completed it. From what I've read here, this option isn't available on all devices.
The following user(s) Liked this Post: Fozzy500
Last edit: 21 Feb 2024 08:19 by Gr8uncleal.
21 Feb 2024 08:18 #4

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

  • Posts: 13446
  • Likes received: 9306

Replied by MarkT on topic Crank seals and carb O-rings

Not uncommon to find what you did.  Autolube oil can seep past oil pump check valve over a long period of storage and fills crankcase with oil.

Trying to kick it over with crankcase full often forces seal out of case from the hydraulic pressure...  and forces oil into pipe.

Seals should be flush.  It appears you may have  groove in crank on ignition side and someone may have tried to push seal in to compensate?

Industry standard size -007 o-ring should be correct, you might try getting one and comparing.  Much cheaper.
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, Fozzy500
21 Feb 2024 08:49 #5

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

  • Fozzy500
  • Fozzy500's Avatar Topic Author
  • Offline
  • Junior Member
  • Junior Member
  • Posts: 21
  • Likes received: 12

Replied by Fozzy500 on topic Crank seals and carb O-rings

Thanks I'll try the picture thing next time.
21 Feb 2024 10:16 #6

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

  • Fozzy500
  • Fozzy500's Avatar Topic Author
  • Offline
  • Junior Member
  • Junior Member
  • Posts: 21
  • Likes received: 12

Replied by Fozzy500 on topic Crank seals and carb O-rings

MarkT good to know. Thanks very much. I might even have some of those o-rings but not sure of their fuel resistance...
Cheers
21 Feb 2024 10:26 #7

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

Moderators: yamadminMakotosunDEETVinnieJames Hart