I traded some work that a friend needed done for a low mile 2009 550 H1 EFI that he let sit for quite some time. I have multiple 4 wheelers, all carbed, thought I would try efi out. I drained all fuel, changed the oil, fresh spark plug, crp8e, which was in the machine, new fully charged battery with good voltage, cranked it up and runs like garbage. lol. Wont idle for more than a few seconds without throttle being rolled on and off. Shut it off, went to adjust the idle, there is no idle screw, so i set at the throttle cable properly and gave it a try. Same result so i turned it off. Put lucas fuel treatment and injector cleaner in the tank in case moisture i missed flushing out the old fuel. Ran it hot for about 30 min rolling off the throttle, to keep it running and not stalled, trying to possibly clear out a clogged injector or throw some sort of efi code... got nothing. I thought it sounded like it was missing almost, so i pulled the plug. it looked a bit fowled, like it wasnt hot enough. I went to the manual, calls for a different plug ngk cr6e, then the cpr8e plug in it. So i get the plug the manual calls for and compare the plugs, see the attachment. They are very different plugs. I do some research and i gather that they are interchangeable. When i look at the connector, i dont see how this is possible since the boot doesn't stay tight on smaller head of the cr6e and it doesnt maintain a good connection but intermittently does run a bit better. I asked my buddy what the deal was, he says it was the original plug and boot and i don't see why he would lie about that one so here I am lol. What do you guys have OEM? anyone else have this issue? Or should i just put the old plug back in and look else where. if it isnt spark and compression is good, how does one go about adjusting the EFI to get fuel right. Does the efi system work like a obd system giving info on injector pressure, map pressures, resistances and such? Im used to adjusting carbs and everything else is diesel. Before anyone would say it, I traded him because they had a bad winter and needed to stop leaking and dont have the money, so im in this EFI realm for better or worse now, plus it is the cleanest looking, least damaged, and least running wheeler in my fleet. lol Thanks guys, look foward to hearing what you have to say.
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