Tonkka Posted July 17, 2022 Report Share Posted July 17, 2022 Hi, I just buy mint conditions 120 hours used Montesa 260 RT 2014. Bike working like new and when engine is cold it´s starts very easily, but after 30 minutes driving when engine is hot starting is nightmare. If i give little fuel straigth to throttle body engine start but running only few seconds. Then after 15-25 minutes waiting engine start and running like new. I already adjust idle speed to around 1850rpm, also i check throttle cable freeplay, then i reset ecu many times but nothing help:( Would someone help what I need to do next? Quote Link to comment Share on other sites More sharing options...
jonnyc21 Posted July 17, 2022 Report Share Posted July 17, 2022 (edited) if you have already update the idle to ~1800, then I would check valve clearance as that would be my first thought. I will start with that and see if that sorts it out. My 2 cents at least. Other simple things to consider: (good to do anyway) Always worth doing some standard maintenance like flush and replace the coolant to be sure heat isn't causing some of the issues, not common but have had a friend boiling his fuel and fresh fluid sorted it for him. Double check the fuel pump filter isn't gummed up (not likely the primary issue, but combined with heat maybe a contributor?) Edited July 17, 2022 by jonnyc21 Quote Link to comment Share on other sites More sharing options...
lineaway Posted July 18, 2022 Report Share Posted July 18, 2022 (edited) Before you waste a lot if time and energy. Open up the air screw a full turn counter clockwise Let idle for a full minute and go ride it for at least 20 minutes and see how it feels. Its almost always low idle is the problem. As mentioned, a new plug and make sure your tank is venting properly. Edited July 19, 2022 by lineaway Quote Link to comment Share on other sites More sharing options...
Tonkka Posted July 18, 2022 Author Report Share Posted July 18, 2022 I try rise idle speed but that not help. Quote Link to comment Share on other sites More sharing options...
Tonkka Posted July 18, 2022 Author Report Share Posted July 18, 2022 Plan is check valve clearance also but that is not readon for that poor start because with extra fuel engine start. I think that fuel pump not make pressure or injector not open when engine is hot. maybe part of reason is very hot fuel… 1 Quote Link to comment Share on other sites More sharing options...
jimmyl Posted July 18, 2022 Report Share Posted July 18, 2022 Try new plug Clean throttle body Check all connections etc Clean pump filter or see if you can swap a tank Quote Link to comment Share on other sites More sharing options...
sectionone Posted July 19, 2022 Report Share Posted July 19, 2022 How tall are you? I am 5'4" and can cold start my 4RT very easily but when it is hot I need to stand on the pegs and give a firm kick. When it's cold, just a lazy push down on the lever but when hot, lean bars against a tree, stand on the pegs and give a forceful kick but not fast. Quote Link to comment Share on other sites More sharing options...
Tonkka Posted July 19, 2022 Author Report Share Posted July 19, 2022 3 hours ago, sectionone said: How tall are you? I am 5'4" and can cold start my 4RT very easily but when it is hot I need to stand on the pegs and give a firm kick. When it's cold, just a lazy push down on the lever but when hot, lean bars against a tree, stand on the pegs and give a forceful kick but not fast. I am 178cm tall and 85kg so that is not reason, I can easily start my friend Montesa when engine is hot but he not can mine. Quote Link to comment Share on other sites More sharing options...
Tonkka Posted July 19, 2022 Author Report Share Posted July 19, 2022 I found the problem. Fuel pump is not good. When pump is warm, pump needs 8-9 amps to starting but after that need only 1-1.5 amps. Thanks for helps. 2 Quote Link to comment Share on other sites More sharing options...
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