OzVMX Forum

Marque Remarks => Yamaha => Topic started by: 3858 on June 07, 2013, 10:59:20 am

Title: CT1 Piston
Post by: 3858 on June 07, 2013, 10:59:20 am

I have a job in the shop at the moment with a nice CT1 engine....  Engine number DT1-164685

Customer wanted a full inspection and re-build.... 

Question is are the Wiseco pistons available going to be satisfactory or should I chase a NOS kit appropriate to the size needed.

I remember in the IT days the Wiseco was different in the intake window but worked?

Title: Re: CT1 Piston
Post by: crossedup2 on June 07, 2013, 12:32:06 pm

The DT1 is a 250cc motor, given the engine number, is a DT2 (I think) with a reed valve. The CT1 is a piston port, CT2 are windowed piston reed valve motor.
250 and 175 pistons (reed valve) a still available and are still via yamaha or evilbay. Wiseco Pistons for DT175A or DT250A would work (in the right engine)!

Peter B

Title: Re: CT1 Piston
Post by: 3858 on June 07, 2013, 01:06:23 pm

Thanks crossedup2 ...awesome info.  I'll try the genuine Yamaha route via the Frame number....

It has a L shaped ring (top), Two hole piston window,  and Alloy reed block so you are on the money..

Title: Re: CT1 Piston
Post by: TT5 Matt on June 07, 2013, 06:44:33 pm

should be plenty of pistons/rings on ebay still

Title: Re: CT1 Piston
Post by: mitch75 on June 07, 2013, 09:03:23 pm

That L shape ring is a dyke ring ;D