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Thanks, I was trying to save a couple of bucks, but in the long run it's costing more !

it truly boggles my one brain cell, trying to figure out why atv owners who ride an utility atv, want to '' get that one extra hp '' ?!..lol. you can only get so much from these machines, after that..its all over but the crying. soo..bottom line: don't bother trying to get 100 hp from an engine that is designed to give you 10 hp..lol.

oem all the way, stay far...far away from any after market parts, when you can get oem. if and when it comes time where we can't get oem anymore ?, then i will use china junk ( we won't have a choice ), until then, i will use oem all the way !. just ask jeep69 what he went through awhile back when he tried using a after market head gasket ?!!..lol.

Awesome, happy for you..yea, meltav helped me take the ECM plunge with the green coil wire to ground test, amazing to think NON OEM can wreck such havoc, here's to many trails and memories 😊

This is a chart of HP Make/size Horsepower Lowest ratio (final:1) The numbers after the HP is the gear ratio Recon 250 15.5 HP 36.8 300 Fourtrax (after 1988) 16.5 HP 55.0 300 Fourtrax (1988) 18 HP 55.0 350 Rancher 21 HP 54.1 350 Foreman 24.5 HP 57.2 400 Foreman 21 HP 56.9 420 Rancher FM/TM 26.5 HP 46.5 420 Rancher AT (IRS) 27 HP 38.8 450 Foreman 24 HP 56.9 500 Rubicon 33.5 HP 58.6 500 Foreman 27 HP 51.0 500 Foreman (FI) 28 HP 53.4 650 Rincon 35.5 HP 17.7 680 Rincon 38.5 HP 17.7 420 Vs 450 HP

Very true, that maybe a warning sign, but first it would be ignition fuse blowing .Went for short ride...wow, like a new machine, idles sweet, plenty of power, so happy, showing 3,250 miles in 14 years..thanks again guys.

It does look like a warm coil might point to a bad ECU on these EFI machines, as that Foreman was doing the same thing.

SUCCESS!!! I got in new OEM PCM today, along with OEM coil (x2), relay and idle air control valve, cranked right up and idled beautiful, coil stayed cool, no blown fuses. Thank you EVERYONE for your input and knowledge and motivating me not to give up..all back together so ride later after grass mowing..once again THANKS to you all who also put up with my whining lol...guess this thread is DONE..maybe it will help someone in the future, I know personally I learned ALOT about my machine.

Took it for a spin and got 1/2 down the street and it started running like crap. i thought “Now what?” but it would smooth out with starter fluid, so I drained the tank and put some fresh gas in, and after feathering it for a few minutes it smoothed up and ran great. Took the mini-me out on the farm, dug out a beaver dam to make her a “waterfall” and it did fine on that trip, so back to the owner tomorrow Thanks again for the input guys!

advice is free...parts are not !..lol. first off, complete engine gasket kit. tube of yamabond ( for where there is no gaskets ONLY ! ). all engine oil seals, D.I.D. cam chain is what i install in all my builds. 3 qrts of atv oil, oil filter, spark plug. air filter. only spec tools you will need: valve spring compressor ( if you do not have one ? ). flywheel puller, centrifugal clutch puller tool. a seal puller ( but not really needed, but works easier than prying seals out with a screwdriver ). service manual for sure !!. have your camera ( cell phone ) on hand to take lots and lots of tear down pics, before, during, after. this way, if you get stumped?, you can always go back, look at pics to see where that thrust washer goes ?..lol. if it were me ? ( i know its not..lol )..i would replace the main crank bearings while you have it torn down, yes..its extra money, but i would do this now, and be worry free for a few more yrs !. a good metric socket set, brass hammer, pry bars, air compressor, air impact gun ( 1/2 ), deep impact sockets, you will need 27mm, 24mm, 22mm, here and there. you can never have enough impact sockets !. some cases, you will need a 30mm, 29mm, 28mm. these come in handy for the hub nuts. not needed, but handy..A PARTS WASHER !. this comes in very handy to rinse out the cases once you get it all part, yes..i go that extra mile when i build my engines. if you get stumped ?, we are always here to help !, myself..i also do phone support..lol.