Raider Rich

Hello Mark Bruce, Eppa Wimbish and all others who followed my thread originally posted 4/25/23. Ihave just now finished working on my Coleman 550X, and it is now running and starting like new. It's problems were twofold, but I believe they all came from a bad air filter installation. (1) We removed the MAF Sensor and it was very dirty -the opening was actually clogged. At the time, we also noticed a lot of crud in the Intake manifold. We cleaned MAF and the intake manifold, and we could then start it with using a small amount of pedal. It would run ok, but not perfect. (2) Decided to check valve clearances and found absolutely no clearance on the intake, but the exhaust was a little greater than .005". We set the intake at .005 and tightened up the exhaust to just a little above .005. Then the engine started without any pedal and now runs like new. Then I checked out all the air intake pipes between filter and manifold.- they were all filthy, so I cleaned thoroughly. I investigated the air filters and housing, and believe that sometime the housing lid was not closed properly. I do not like the housing design, because the lid has to be installed only one way and fastened down correctly in order to hold the filters securely in place. I believe it is virtually impossible to secure the clips on the lid with medium to large fingers, so I made a tool to do this. I believe this may have been the root of my problems. Unfortunately, now I have to worry about how much damage may have been done to the engine by it's breathing dirty air.

Hello Mark, Has your UTV Dr resolved your problem yet? If you can't get good factory injectors, then where can you get them. I haven't started on mine yet, as we are finishing up a cattle watering project. Also I need to get a new spark plug wire, which arrived yesterday. One problem I have is that I have no UTV repairman within about 60 miles, so I and a hand am going to have to troubleshoot and solve the probleem. Keep me posted - I have a feeling my problem is also going to be the injector. Raider Rich

Mark, Thanks for your input. I haven't had time to work much on my UTV yet,, and I was hoping to hear a few more comments back. Actually, the next thing I was goint to look at was the injector and the sensor both of which you have already checked. I will certainly l will certainly let you know if I determine the problem. Raider Rich

I have a 2022 Coleman UT 550X Outfitter purchased April 2022 that has about 200 hrs on it. About 4 weeks ago we noticed a little difficulty in starting. Instead of the usual starting without giving any pedal, we had to depress the accelerator pedal slightly in order for it to start and keep on running. Otherwise it ran fine, but last week, it would not start at all. We have checked the fuel pump, fuel filter and spark, and all seem fine. We actually replaced the spark plug. Don't know where to go from here - anybody have any suggestions?