damorev3 Posted August 7, 2009 Report Share Posted August 7, 2009 Hi, i recently had my ty175 re-bored and it came with a It 175 piston kit ? i was just wondering what replacement pistons people put in there bikes . also what piston goes in the 200 conversion ????? Quote Link to comment Share on other sites More sharing options...
feetupfun Posted August 8, 2009 Report Share Posted August 8, 2009 There has been lots of discussion on these forums already on this subject. Have you done a search on the topic? I use Pro-X pistons for 66mm - 68mm TY175 rebores Quote Link to comment Share on other sites More sharing options...
damorev3 Posted August 8, 2009 Author Report Share Posted August 8, 2009 no,i havent searched the forum i will do that now. Are the pro-x pistons Ty ones ? or are they for the It 175? my piston was a mitaka one but said It175 on the box thanks for reply Quote Link to comment Share on other sites More sharing options...
feetupfun Posted August 9, 2009 Report Share Posted August 9, 2009 I'm pretty sure it did not say TY175 on the Pro-X box but the box is gone now so I can't check. I suspect it said either DT175 or IT175. Some people have made out that there are differences between TY175, IT175, MX175 and DT175 Yamaha pistons and that these make a difference to the way the TY175 motor runs, but I have used TY, IT, DT Yamaha pistons over the years and have never noticed any difference to the way they run, and not noticed any differences to rear skirt length or crown shape or height. The holes in the back may have been different shape or size, but because of the reed valve, are not critical to the functioning of the TY175 motor. I have even used a CT3 piston in a TY175 back in the late 1970s and just cut the holes in the rear bigger to match the TY piston that came out, and it went fine too. Pro-X pistons are made in Europe somewhere (I forget where) using the same technology (metal and manufacturing techniques) as the pistons that were fitted to new Japanese bikes in the 1970s. Have a look at their website for details. Quote Link to comment Share on other sites More sharing options...
damorev3 Posted August 9, 2009 Author Report Share Posted August 9, 2009 thanks for reply >damo Quote Link to comment Share on other sites More sharing options...
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