wendash Posted March 29, 2012 Report Share Posted March 29, 2012 Hi everyone, I'm hoping that some of the experts can help! I have an MH123 frame with a 200 engine fitted. The engine number starts with 29H. The only reference to 200 engines I can find is 29M. Does anyone know what my 29H motor actually is? I have a Cota 200 (not MH200) owners manual that states for Castrol TT (which I use) the ratio is 4% (25:1). I have seen posts on here that state 40:1, 50:1 and even 80:1. Does anyone know the definitive answer to the petrol/oil ratio? Mine does smoke a lot!! Any help greatly appreciated. Thank you Ash Quote Link to comment Share on other sites More sharing options...
helloyes Posted March 29, 2012 Report Share Posted March 29, 2012 50:1 should be about right Quote Link to comment Share on other sites More sharing options...
woodbutcher Posted March 29, 2012 Report Share Posted March 29, 2012 50:1 FOR FUEL MIX 29H DENOTES MONT/HONDA 200 ENGINE - 64MM BORE 28H SHOULD BE 125CC - 54MM BORE 200CC TOP END WILL FIT ONTO 125CC Quote Link to comment Share on other sites More sharing options...
wendash Posted April 2, 2012 Author Report Share Posted April 2, 2012 Thanks very much, 50:1 it is then. Does anyone know the correct jetting for this? It has a Mark 2 Amal carb with standard airbox and filter. Thanks Quote Link to comment Share on other sites More sharing options...
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