foley92 Posted May 26, 2015 Report Share Posted May 26, 2015 Hi guys, i have an 05 montesa cota 4rt repsol the bike will start but once started runs rough and sounds like its going to stall also whilst on tick over it sounds like a mis fire/ air being compressed out the exhaust, does anybody have any ideas of this issue as im totally clueless even after reading the manual. Cheers ben Quote Link to comment Share on other sites More sharing options...
dadof2 Posted May 26, 2015 Report Share Posted May 26, 2015 Valve clearances? Air leak in exhaust? Quote Link to comment Share on other sites More sharing options...
mazz46 Posted May 26, 2015 Report Share Posted May 26, 2015 Vac pipes split? Quote Link to comment Share on other sites More sharing options...
jrsunt Posted May 26, 2015 Report Share Posted May 26, 2015 If it gets worse when its warm it's likely to be valves, worth checking them anyway. Quote Link to comment Share on other sites More sharing options...
ham2 Posted May 27, 2015 Report Share Posted May 27, 2015 Like Do2 says; check the exhaust manifold/cylinder junction for a leak? Seen it before, created havoc... for such a small fault. Quote Link to comment Share on other sites More sharing options...
guys Posted May 27, 2015 Report Share Posted May 27, 2015 Do all the above + Check the ignition timing. Replace the spark plug and check if the plug cap and wire are ok. Make sure the entire ignition system is ok: no cracked coil or loose wires for instance. Check the idle speed. ... Quote Link to comment Share on other sites More sharing options...
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