west1700 Posted July 4, 2013 Report Share Posted July 4, 2013 When I brought my 1974 TY it had a twin spark plug head which I suspect is from a DT, I have now purchased the correct head from Ebay and am going to swap it out, I am just curious as to if this is a standard mod or just a one of on my bike. Quote Link to comment Share on other sites More sharing options...
gloud Posted July 4, 2013 Report Share Posted July 4, 2013 Well I don't know if it was a standard mod but my 74 TY250a has one. (But then it was a mongrel when I got it lots of weird parts) When you take the 2 plug head off I would be interested if it was higher or lower compression? Quote Link to comment Share on other sites More sharing options...
dadof2 Posted July 5, 2013 Report Share Posted July 5, 2013 Perhaps someone drilled and tapped a decompressor hole? Quote Link to comment Share on other sites More sharing options...
bestrcpilot Posted July 6, 2013 Report Share Posted July 6, 2013 Hello west you do not say which TY you are talking about, a 175, 250, or mono. If a 175 using a MX head is a way to up the compression. On the 250 some people would use the Dt head in order to use a decompresser. And both of these were done back in the day. Hope you find this of help. Quote Link to comment Share on other sites More sharing options...
west1700 Posted July 12, 2013 Author Report Share Posted July 12, 2013 Thanks for the information, it is a TY 250, looking at the new single plugged head I see there is a casting blank where the head could be drilled and tapped. Fitted the new one now with the twin plugged as spare. Quote Link to comment Share on other sites More sharing options...
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