Jump to content

CT1 or CT2?

Moshpitmickey
Moshpitmickey
in Classics

Featured Replies

Posted

I have a yamaha with a production sticker that shows manufactured in 08/72. The first three numbers on the engine are CT1. I have always assumed it was a CT2 but recently noticed the CT1 on the engine. Any idea which one it is so I can start getting a few parts?

Thank you,

Mick

  • Quote
    • Moderator

    On a 72 bike the designation CT1 or CT2 actually refers to the engine, CT1 has an engine with 5 transfer ports with no reeds and the CT2and CT3 has 7 with reeds. Although people used to fit the reedblock and carb from the 7 port engine. Its been on here a few times.

    Problem being they all start with CT1 for the 175 in the chassis/engine prefix as far as i'm aware up to around 75/76 so you need to look more closely at the actual engine/frame number.

    If you post the engine number, less the last 3 or 4 digits then we should be able to narrow it down for you.

    Oh and welcome to the mad house..... :blink::o:blink::P

  • Quote
    • Author

    The numbers are as follows: CT1-112928. I did see somewhere on google that a number starting with 1 was actually a CT3. Anyway, thanks for replying and for any help. I am only the 2nd owner and only 3300 miles. It's been sitting inside for over 30 years. Unfortunately gas was left in the tank and I'm having a ball getting it cleaned up.

    If you post the engine number, less the last 3 or 4 digits then we should be able to narrow it down for you.

  • Quote
    • Moderator

    The numbers are as follows: CT1-112928. I did see somewhere on google that a number starting with 1 was actually a CT3. Anyway, thanks for replying and for any help. I am only the 2nd owner and only 3300 miles. It's been sitting inside for over 30 years. Unfortunately gas was left in the tank and I'm having a ball getting it cleaned up.

    If you post the engine number, less the last 3 or 4 digits then we should be able to narrow it down for you.

    CT1-112928, ok Looking at this you could have a CT3 cant see them making 12000 of em though. I'll see if i can't track down some better details.

    CT1 Year: 1971 CT1-000101

    CT1B Year: 1970 CT1-010101

    CT1C Year: 1971 CT1-200101/CT1-032101

    CT2 Year: 1972 CT1-065101

    CT3 Year: 1973 CT1-100101

  • Quote

    • Join the conversation

    You can post now and register later. If you have an account, sign in now to post with your account.

    Guest
    Reply to this topic...
    Go to topic listing