petermac Posted January 3, 2016 Report Share Posted January 3, 2016 Got me stumped this one Starts first kick, will tickover for ages. Will rev up if throttle opened slowly. Snap throttle open to full throttle and it sounds Luke it's going to die but keeps running .Knock throttle off and it ticks over again I have put new plug in, cleaned out internals of throttle body, plenty of fuel, clean air filter Any ideas Quote Link to comment Share on other sites More sharing options...
mattv6 Posted January 3, 2016 Report Share Posted January 3, 2016 I had that exact same problem on my 2009 4rt, turned out to be the throttle position sensor in the throttle body. I removed the cover and made a small shim so the throttle went to 99% only and it solved it...saved replacing the throttle body. My assumption was that the TPS sensed 101%, and ecu decided that isn't possible so gets its self I a bit of a twist. If you can borrow one maybe try someone else's throttle body. Hope this helps. 1 Quote Link to comment Share on other sites More sharing options...
ham2 Posted January 3, 2016 Report Share Posted January 3, 2016 I saw one run just as poorly as described...turned out to be a loose exhaust manifold. 1 Quote Link to comment Share on other sites More sharing options...
johnnyboxer Posted January 4, 2016 Report Share Posted January 4, 2016 (edited) I saw one run just as poorly as described...turned out to be a loose exhaust manifold. My thoughts when I read post 1Happened to me at a trial Lost one of the 2 header nuts, but it wasn't loose, just weeping enough to cause the symptoms above Managed to finish the Trial though Edited January 4, 2016 by johnnyboxer 1 Quote Link to comment Share on other sites More sharing options...
jimmyl Posted January 4, 2016 Report Share Posted January 4, 2016 Fuel pump or fuel pump filter? Does it get worse when hot. See if you swap a tank to eliminate 1 Quote Link to comment Share on other sites More sharing options...
petermac Posted January 4, 2016 Author Report Share Posted January 4, 2016 i will check the exhaust manifold nuts and also the tps in the throttle body thanks peter Quote Link to comment Share on other sites More sharing options...
ronnie Posted January 4, 2016 Report Share Posted January 4, 2016 I had this on my Mont 2007 fuel tank also getting hot cleaned fuel filter and cleaned all wiring connectors to throttle body not had a problem since Quote Link to comment Share on other sites More sharing options...
petermac Posted January 7, 2016 Author Report Share Posted January 7, 2016 I fitted a grub screw to act as a throttle stop for full throttle and am please to say it's sorted it out Thanks Peter Quote Link to comment Share on other sites More sharing options...
jimmyl Posted March 8, 2016 Report Share Posted March 8, 2016 Hi petermac/mattv6 is your PTB still sorted with these mods or has the problem returned etc. Quote Link to comment Share on other sites More sharing options...
mattv6 Posted March 8, 2016 Report Share Posted March 8, 2016 Mine was fine for the 8 months or so that owned the bike for after that. I sold it then to get another 4rt. Not because it was a problem, just because I wanted a 260cc 4rt. Quote Link to comment Share on other sites More sharing options...
jimmyl Posted March 8, 2016 Report Share Posted March 8, 2016 Mine was fine for the 8 months or so that owned the bike for after that. I sold it then to get another 4rt. Not because it was a problem, just because I wanted a 260cc 4rt. Cheers Matt Got a new 2015 last year but put my old PTB on it. Had a couple of instance of when going for a big handful it started missing - will try a stop to see of its that. Quote Link to comment Share on other sites More sharing options...
petermac Posted March 9, 2016 Author Report Share Posted March 9, 2016 Mine has been fine since this modifications Quote Link to comment Share on other sites More sharing options...
jimmyl Posted March 9, 2016 Report Share Posted March 9, 2016 Mine has been fine since this modifications cheers. any photos of the mod thanks Quote Link to comment Share on other sites More sharing options...
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