OzVMX Forum

Clubroom => Bike Talk => Topic started by: twinrock on July 06, 2008, 07:05:07 pm

Title: help needed with finding pistons for ty175 1977
Post by: twinrock on July 06, 2008, 07:05:07 pm

hey guys i ordered a piston for a ty..i had the bore done then on assembly i noticed the piston sat too high at tdc, i took it out and compared it and its totally different..it was a dt175..i rang the distributor.pro x, and he said they had no listing for ty..so now it seems i may be stuck with the dt175..(any takers 66.5mm) does anyone know where i can get a non genuine piston ..or perhaps what other modles also ran the same one thanks..

Title: Re: help needed with finding pistons for ty175 1977
Post by: Nathan S on July 06, 2008, 07:25:20 pm

How big are the holes in the piston skirt?
If they're big enough to put your finger through, then you've got a late model DT piston.
If they're itty-bitty little ones (about 10x10mm) then you've got a problem.

Of course, the real measurement is the centre of the gudgeon to the edge of the piston crown - bet that the piston you've got is 5mm taller than the TY piston (ie: late DT).

Early DTs take the same piston as TY, I think. I'll check tomorrow for you.
Wiseco do early DT pistons.

Failing that, get a short (100mm centre to centre) rod from a late DT from ProX.

Title: Re: help needed with finding pistons for ty175 1977
Post by: vmx42 on July 07, 2008, 09:15:02 am

Nathan,
Try http://tytrials.co.uk in the UK. I am sure they can help you.
VMX42

Title: Re: help needed with finding pistons for ty175 1977
Post by: David Lahey on July 08, 2008, 06:03:19 pm

Pro-X make good piston kits for TY175/early DT175 and are quieter than Wiseco. Ask for DT175 A,B,C,D