Runner FX 125 2 Stroke Have just finished a rebuild, new bearings, seals, water pump, oil pump cogs and belt, new Malossi reeds, new piston and rings with corrected ring end gap, horned head to deglaze, oil and fuel pipes, rollers, exhaust gaskets, bolts and studs, new air filter. Gave everything else a good clean and check. Third time on split and rebuild so had a reasonable idea on assembly. All went well, bike started first time. After a few adjustments running fine. However 50 miles on and still running bike carefully I have noticed that the temperature gauge was rising. Thought nothing of it as its Summer and riding in London stop and start etc. But on the way home tonight the bike just died. Had a quick look at the temp gauge and was just under half way. By side of road, put a new plug in and checked there was no air in the coolant by bleeding. Bike started and home I came. Then readjusted the air/fuel mixture on carb and let the bike get hot until fan came on, all seems okay. Changed over the spark to a new one and went for a ride for about five miles. Below is what the new spark looks like after a short ride, again temp gauge went to about half way and fan came on, rode around the block, and bike did not cut out. Just to add that the coolant is different to what I had previous, its the new Putoline Coolant NF green in colour, so washed out old coolant, blue, with water before adding new coolant. I've attached the photos of the spark plug, any advice on what people think. My worry is don't want to break down half way to work, getting on now and it kills me pushing the bike more than 50 yards. Thanks for any advice.
im not sure about the temp gauge as mine is running a different temp sensor that moves more then stock. i will say tho most people and tuners say the gauge should barely move and the fan rarely ever comes on, i know mines never kicked in running a 172 and standard gearing and having had a good blast down the a23 dual carriage ways
Had the carb off before coming to work and have a 96 on the jet, would this be the problem? Now that I renewed lots, more sensitive, never changed it so has been on for a while. Also as far as I can remember the temp gauge rarely moved previously. So 96 on a the moment, has this been my problem all along?
Got the new jet 86 and a standard idle jet 45, checked there was no air leaks and adjusted the carb. Place a new spark and went for a ride. Spark is a nice even chocolate colour with no oil, first time in years. However two things. Firstly, using a tachometre, I can't get the rpms above 4,000 using the idle screw, its all the way in, book state 4 to 5 thousand. Most importantly, the temp gauge is still rising to about 20% up on the dial, could this be the new organic coolant? Is this normal, I've been riding for years and don't remember it going that high, but for heavy traffic. Checked the pipes and bottle all are hot, so pump must be working... But, I did something when I had the engine out, which I guess might be the problem, I cleaned the thermostat, as was caked up with rubbish. Do you think I've done a wrong move there? Any other ideas or thoughts would be welcomed. Thanks.
Got the thermostat out this morning, opens a bit sooner than the Haynes Manual states, also the valve lift is 6.2mm where as the manual states 3.5mm at 80C. Would this matter that the Thermostat is opening more than the manual states?
