I have a 98 honda foutrax 300 4 wheeler it started acting up and now it wont start took the carb. off and cleaned the jets and everything up and pulled the spark plug out and put my fire over the hole and its getting compression and used a spark tester and its getting spark put a new spark plug in it and it still wont start even with starting fluid spraying in it any ideas on what it is

Hi, Joshua may be a Throttle Position Sensor for more information about your issue and free downloads that you will need please visit the websites below. Good luck and have a nice day.
1998 honda cbr f3 carburetor tps sensor Google Search
Maintenance Carburetor Removal Part 1 1998 Honda CBR 600 F3 http://www.cbrfan.com/how/1726-how-carb-clean-97-cbr-600-f3.html
1996 1998 Honda CBR600F3 Service Manual Moto Data Project http://hondampe.com.au/docs/owning_a_honda/owners_manuals/motorcycles/CBR600F-1998.pdf

If its been sitting you will need to pull the carbs and clean or replace the pilot jets, and clean everything else too. The pilot jets control idle fueling and are easily clogged.

that is just a hand primer for when you run out of fuel. you may need to change the fuel filter. and clean out the fuel chamber and veins in the carb. if filter is old 2 years then it should be changed.

I would say that the incorrect of use of gasket goo instead of the proper gasket has spilled into the bowl after assembly and is blocking the main jet --again
when working on a carby , there is no successful "short cut or lazy action"

Pull the carb and throughly clean it after sitting the old fuel will turn to varnish and clog everything up. also if the machine was on its top check the oil and make sure it is clean. leaking gas is a indicator that you will probably need a carb kit for it that must include the float valve and needle.

You have to adjust the jets on the carb, theres a high and low jet, Turn them both all the way in ( dont force them) just turn until they stop, now losen each one in 1/4 intervals and try running it,

CLEAN THE CARB AGAIN IF IT RUNS ON STARTING FLUID ITS NOT GETTING FUEL YOU WILL NEED TO REMOVE THE JETS AND MAKE SURE THEY ARE CLEAR

I could not locate a diagram of your machine's carburetor. I can tell you, for certain, that the carb does have a rubber drain tube that goes from the bottom of the float bowl and vents to atmosphere beneath the vehicle.
There are three required ingredients required for combustion: fuel, compression, and a spark (at the right time). Try to find out which of these are missing. Loosen the drain screw on the float bowl. Is fuel present? Check the compression - you've got to see at least 140 psi for anything to happen. Pull the spark plug and crank the engine. Is there a spark?
If it has sat for an extended period of time (more than just a couple of months) then the carburetor will be plugged with fuel varnish. It is very easy to think you've got everything cleaned, when the jets are still plugged up. I would take the carb apart and remove the jets. Hold them up to a light source and look through each one. If you can't see through them, there's the problem.

Sounds like a loose piece of crud in the main jet. Have you had the jet and tube above it out? It could also be a spark problem. See if you have spark when it tries to die ( put a nail in the plug boot and get it sparking 1/4" or so to the plug at idle then rev it up, it should continue jumping. I think that bike will also have mechanical spark advance on the rotor on the end of the cam. If the springs are loose on that the spark timing will be all over the map and can make it run intermittantly.
Jordan

Where is the cdi box located??