feetupfun Posted September 7, 2016 Report Share Posted September 7, 2016 I can answer that one b40rt. Wiseco pistons expand more with temperature rise than original Yamaha pistons. The extra heat created while new rings bed into a fresh bore can take the piston temperature (size) to the point of being at risk of piston-to-bore seizure, more so than with the lower expansion rate Yamaha piston. Of course as well as the way the break-in is done, the risk of piston/bore seizure also depends on what clearance the rebore was done to. 1 Quote Link to comment Share on other sites More sharing options...
b40rt Posted September 7, 2016 Report Share Posted September 7, 2016 Cheers Feetupfun, just put one in a Rotax motor and it got hot quickly as you say. Has about 3 hours on it now and sounding / running really well. Quote Link to comment Share on other sites More sharing options...
guy53 Posted September 10, 2016 Report Share Posted September 10, 2016 Right on with the details David. When I have a rebore done on one of my TY with Yamaha piston , I usually ask for a .002 inch clearance and I do the running in over 2 days : first morning, start and run for about 30 sec, and in the afternoon, start and run until I can feel the heat on the cyl., let it cool and repeat. The next day I repeat but i run it longer. I know it's over over overkill but I had one done ever 10 years ago that has not started to rattle yet. Guy Quote Link to comment Share on other sites More sharing options...
slack Posted September 16, 2016 Report Share Posted September 16, 2016 This is a picture of my Ty which is road registered. 1 Quote Link to comment Share on other sites More sharing options...
old ugly Posted October 27, 2016 Report Share Posted October 27, 2016 my 1977 ty250. I am pulling it apart to refresh it. 1 Quote Link to comment Share on other sites More sharing options...
slack Posted November 5, 2016 Report Share Posted November 5, 2016 Here is a photo of the next project when I finally get round to building it as it has Been under my bench for a few years now. Its got the shortened inlet mod and a new pink mudguard which I purchased from Ctc. 1 Quote Link to comment Share on other sites More sharing options...
jon v8 Posted November 5, 2016 Report Share Posted November 5, 2016 my 1977 ty250. I am pulling it apart to refresh it. That's in way better nick than my current old nail of a TY, but it still goes so well I can't be bothered to do anything to smarten it up.It was out today on firewood duties,being thrashed around in the mud by my son. 1 Quote Link to comment Share on other sites More sharing options...
aaku Posted November 24, 2016 Report Share Posted November 24, 2016 Here is my 1976 ty175 2 Quote Link to comment Share on other sites More sharing options...
littel Posted July 5, 2017 Report Share Posted July 5, 2017 Quote I have a couple ofTY's 5 Quote Link to comment Share on other sites More sharing options...
littel Posted November 7, 2017 Report Share Posted November 7, 2017 On 7/5/2017 at 4:47 PM, littel said: I have a couple ofTY's 5 Quote Link to comment Share on other sites More sharing options...
jon v8 Posted November 8, 2017 Report Share Posted November 8, 2017 Nice bikes,like the Range Rover too... 1 Quote Link to comment Share on other sites More sharing options...
thai-ty Posted December 27, 2017 Report Share Posted December 27, 2017 (edited) My two '84 250 mono's... 'Ol Blu and 'Ol Yeller... Edited December 27, 2017 by thai-ty 7 Quote Link to comment Share on other sites More sharing options...
john b Posted January 4, 2018 Report Share Posted January 4, 2018 My son (15) on his TY - second in experts in his class in the Kia champs last year ???? 4 Quote Link to comment Share on other sites More sharing options...
hrmad Posted March 21, 2018 Report Share Posted March 21, 2018 My first twinshock ty175 2 Quote Link to comment Share on other sites More sharing options...
richardgg Posted March 22, 2018 Report Share Posted March 22, 2018 3 Quote Link to comment Share on other sites More sharing options...
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