paul_b1 Posted October 27, 2013 Report Share Posted October 27, 2013 (edited) Is the rear silencer and center expansion chamber from a 125 compatible with a 280/250? The front pipe is 45mm diameter and the outlet from the center to rear is 30mm. Also is the expansion chamber a silencer as well i.e. does it contain packing? Edited October 27, 2013 by paul_b1 Quote Link to comment Share on other sites More sharing options...
richt Posted October 28, 2013 Report Share Posted October 28, 2013 (edited) The parts cat' only lists one middle section so from that I would say it is compatible. It is a silencer with some sort of packing in it but it is all welded up so I have not seen inside. The outlet size is the same. Edited October 28, 2013 by richt Quote Link to comment Share on other sites More sharing options...
sting32 Posted October 28, 2013 Report Share Posted October 28, 2013 when in doubt, like I am now about your answer, I would look it up on a PARTS BREAKDOWN at gasgas Spain's site, (here's the starting point for manuals... http://www.gasgasmotos.es/en/manuals.html (exploded means parts breakdowns in "exploded views" and the list part numbers. older parts breakdowns (from memory) might list all 3 models in same explode, so you could see it like this. txt125 txt250 txt280 txt300 Part1# Part2# part2# Part3# if numbers are same then obviously same. might depend on years for sure? they usually list parts in a chart for what fits what, like above on some part views, or used to. 2 Yes they have packing that you can repack... they tend to fill with oil/soot, new packing is just fiberglass stuff made for silencers, don't lose the screen around the tube in the middle, I clean everything I can off the tube and screen... Quote Link to comment Share on other sites More sharing options...
paul_b1 Posted October 31, 2013 Author Report Share Posted October 31, 2013 Cheers! I put the wrong sizes down aswell....they are 45/28 respectively. Had a look on the manual/parts guide and they use the same centre box and same silencer from 04 onwards.....some (not all) had a different silencer on 02/03 bikes but again had the same centre box so would presume that as long as it's the same style silencer it will be fine! Quote Link to comment Share on other sites More sharing options...
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