tony27 Posted July 8, 2017 Report Share Posted July 8, 2017 15 hours ago, bluegnu said: Can anyone tell me why the exhaust header pipe I just got on a well-known auction site has a narrow neck where it joins the cylinder? First I thought it was from a smaller CC, but looking at other ones online I've seen them advertised from the 290cc. My bike goes well with it on but will it overheat? It will be an insert that is normally fitted for use on 125s, see if you can remove it as it will have an effect on a 290 Quote Link to comment Share on other sites More sharing options...
copemech Posted July 9, 2017 Report Share Posted July 9, 2017 (edited) On 7/7/2017 at 10:14 PM, tony27 said: It will be an insert that is normally fitted for use on 125s, see if you can remove it as it will have an effect on a 290 Early 125 pipes were made small and did not require an insert. It is ona them! Edited July 9, 2017 by copemech Quote Link to comment Share on other sites More sharing options...
copemech Posted July 9, 2017 Report Share Posted July 9, 2017 Put it back together and run it on 80:1 full synthetic good oil and rev it out on occasion to get some heat into it. Quote Link to comment Share on other sites More sharing options...
bluegnu Posted July 10, 2017 Author Report Share Posted July 10, 2017 Is it likely to be damaging on a 250cc engine do you think? It doesn't appear to be an insert, more like the whole neck is narrow. Here's what the two exhausts look like side by side - my old 2.5 exhaust (left) and the narrow on the right: Quote Link to comment Share on other sites More sharing options...
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