tony27 Posted April 17, 2019 Report Share Posted April 17, 2019 YTZ250 is a trike, otherwise known as the TRI-Z Bore diameter looks to be 68mm, wiseco part number 515M06800 for the standard size kit Quote Link to comment Share on other sites More sharing options...
lineaway Posted April 18, 2019 Report Share Posted April 18, 2019 (edited) 23 hours ago, Tillerman6 said: dannyboi, I think there is a typo in that message. I never heard of a "YTZ" 250. I HAVE heard of a YZ 250, and in the years 76-79 you might find a piston that will work for you. You should stay off topics that have nothing to do with your old engine. Everything about a ty 250 mono is different from your old bike. We are talking about an engine that came out in 1984, not 1974. And by the way Dannyboi the TY250R had a standard bore of 68. So you would want at least a 68.25. Edited April 18, 2019 by lineaway Quote Link to comment Share on other sites More sharing options...
Tillerman6 Posted April 18, 2019 Report Share Posted April 18, 2019 No problem Lineaway, Just trying to help. Quote Link to comment Share on other sites More sharing options...
dannyboi Posted April 18, 2019 Author Report Share Posted April 18, 2019 Thanks for all the responses guys I really appreciate it, Tillerman6 I will weigh them for you if I go down that route cheers! Quote Link to comment Share on other sites More sharing options...
thai-ty Posted May 13, 2019 Report Share Posted May 13, 2019 On 4/16/2019 at 3:32 PM, dannyboi said: I was looking to get it bored out to 70mm, but they say they will need a good couple of goes to take the 3mm off so it’s looking around £120, I bought the piston kit off of wemoto for £35 hoping that would be it a YTZ standard piston will fit my 67mm bore? thanks I buy some stuff from Wemoto. They are an a-ok honest shop to deal with. However, those pistons they sell for 35 quid for a ty mono are useful as an ashtray - nothing else. You have been warned. There is a reason why a Wossner/Wiseco piston costs around a hundred quid, and more for a genuine Yamaha item. Think about it. Quote Link to comment Share on other sites More sharing options...
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