searay175 Posted November 25, 2009 Report Share Posted November 25, 2009 I recently bought a ty250c and the decal on the heat shield was changed to "trials 300". Was there a enginge mod that would boost it to 300? Thanks! Steve Quote Link to comment Share on other sites More sharing options...
alan_nc Posted November 25, 2009 Report Share Posted November 25, 2009 One of the fellows I ride with has one. Also has an electronic ignition. I don't know if these are modifications he had done or they are factory. He doesn't check in here but I'll ask him. Bike runs extremely well and for an older gent he is quite a good rider. Alan Quote Link to comment Share on other sites More sharing options...
searay175 Posted November 25, 2009 Author Report Share Posted November 25, 2009 The frame and engine numbers match and the jug has the 246cc stamp. I was wondering if they had a big bore kit. Quote Link to comment Share on other sites More sharing options...
famousamos Posted November 26, 2009 Report Share Posted November 26, 2009 I ride a 74 ty that's a 290 now, 75mm bore, pulls like crazy at our altitude, events at 5000 to 9200 ft. Tony Down did a blog on the bike, it at http://blackcatvintagetrials.com/2009/10/30/freds-fancy.aspx Lots of mods done. Fred Quote Link to comment Share on other sites More sharing options...
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