54tphill Report post Posted February 23, 2020 Help please , I was riding in a trial today and whilst in a section my 4rt just cut out, I couldn’t get it to restart, did the usual reset but no joy, it was like as if I’d ran out of fuel but I hadn’t. I Retired and went home. Any ideas ? Quote Share this post Link to post Share on other sites
jimmyl Report post Posted February 23, 2020 Any more info- have you had anything in bits before hand etc sounds a strange one . lanyard cables, deep water etc etc Quote Share this post Link to post Share on other sites
54tphill Report post Posted February 23, 2020 No the bikes not been in water, muddy wet day, been through a couple of decent puddles. The bikes had a lanyard switch fitted the some day a bought it. Cheers for your help Quote Share this post Link to post Share on other sites
2stroke4stroke Report post Posted February 23, 2020 Is it sparking? Quote Share this post Link to post Share on other sites
misscrabstick Report post Posted February 23, 2020 Basic checks, compression, spark, fuel. You could have a wet wires issue, a component failure such as a fuel pump, You could remove the injector leave it plugged in, kick it and see if it squirts? Quote Share this post Link to post Share on other sites
lineaway Report post Posted February 23, 2020 Your idle is set too low. This happens all the time. I believe you turn it out. Try 1/2 to a whole turn. Quote Share this post Link to post Share on other sites
jonnyc21 Report post Posted February 24, 2020 As lineawy indicated adjusting the idle is an easy check and worth a quick try. As above check spark, if you have that then the next in my mind is compression because its an easy check and then fuel. However with what you indicated I would expect it to be spark or fuel as compression usually would show up as early starting or other hard running issues first before just not starting. My 2 cents on how I would look into it... If you do not have spark I would try disconnecting the kill switch and checking spark again, if still no spark start checking the wires and see where you might have a loose wire or wet connectors from the muddy conditions. If you have a gauge to check compression I would do that next just because its quick and easy. Now If you have spark I would use a 12 v battery to check the fuel pump, if that works then continue down the line to see if you have fuel coming out of the injector. If you hit a wall with all of the above let us know. Quote Share this post Link to post Share on other sites
kevin916 Report post Posted February 24, 2020 Had exactly the same problem with my son's 4rt. Turned out to be faulty lanyard switch. Good luck ! 1 Quote Share this post Link to post Share on other sites
b40rt Report post Posted February 24, 2020 And try a new plug to eliminate that. 1 Quote Share this post Link to post Share on other sites
54tphill Report post Posted February 24, 2020 Went in my garage to try kick the 4rt up today, didn’t kick up so I did a reset doing the 3 slow kicks with the throttle open, then tried again, 2nd kick it’s burst into life, I let it run until the fan came on. So it seems it’s fixed it’s self??? Quote Share this post Link to post Share on other sites
duggan Report post Posted February 24, 2020 Definitely sounds like the idle is a touch low, this can make them very temperamental to start. 1 Quote Share this post Link to post Share on other sites
Jim Townsend Report post Posted February 24, 2020 How do you set the idle on a 4rt Quote Share this post Link to post Share on other sites
duggan Report post Posted February 24, 2020 By adjusting the large brass screw on right side of the throttle body. I use a digital tachometer that picks up the rpm from a wire wrapped around the spark plug lead, set to 1800rpm and forget. 1 Quote Share this post Link to post Share on other sites
54tphill Report post Posted February 25, 2020 Do anyone know for certain which map is which, and should it be on a particular map when setting up the idle? Quote Share this post Link to post Share on other sites
jimmyl Report post Posted February 25, 2020 I work on the philosophy of big switch pushed in big map -IE more aggressive map. It doesn't matter which its on for tick over setting 1 Quote Share this post Link to post Share on other sites
