slack Posted December 11, 2011 Report Share Posted December 11, 2011 Hi everyone my mate asked if i would ask the question as he does'nt have the internet.We were at the trial today on second lap when his 4rt started to play up,it would tick over & run on low revs but when you tried to rev it hard it just bog'd down & would'nt rev.So we went back to van & put a new sparkplug in it sorted until we got half way round then the same happend again.Anybody had this problem & how did you rectify it.Cheers Quote Link to comment Share on other sites More sharing options...
jimmyl Posted December 11, 2011 Report Share Posted December 11, 2011 Possible 2 option off the top of my head 1) tickover too low 2) Fuel pump on way out -hope its tickover. What year bike is it? Quote Link to comment Share on other sites More sharing options...
windlestone Posted December 11, 2011 Report Share Posted December 11, 2011 4rt's have a 'limp home mode' when the engine is overheating the ECU will shut down the performance. you can only rev a little then it will cut out run terrible. It will run perfectly on low revs to get you back to the van. The symptoms Bunny described sounded like a plug today but now reading this it's more likely to have been running too hot. when the engine was off to have the plug changed it cooled down enough to run properly again. Tell him to try turning the engine off in quesues in future Quote Link to comment Share on other sites More sharing options...
slack Posted December 12, 2011 Author Report Share Posted December 12, 2011 Thanks guys its an 05, & he did say it smelt hot yesterday. Quote Link to comment Share on other sites More sharing options...
baldilocks Posted December 12, 2011 Report Share Posted December 12, 2011 yesterday was pretty cold at butsfield has he checked the coolant recently and is the cooling fan working ? Quote Link to comment Share on other sites More sharing options...
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