If my 03 Honda CRF 150f is loosing/low compression what do i do?

Have you actually lost compression?

Do a compression test to see if it is up to spec.

Loss of compression can be a lot of things.

1. Valves are not seating.

2. Worn piston rings.

3. Worn piston.

4. Blown head gasket.

If it is one of the items listed above you are going to need an engine rebuild. Get ready to bust out your wallet if you don't know how to rebuild a 4-stroke.

If you do decide to tackle it yourself, make sure you have a shop manual for your specific bike and take pictures as you disassemble.

Lol. If its a CRF 150F would not have reeds. Reeds are for 2 stoke. CRF is 4 stroke. in case you in user-friendly terms desire to hill climb and not unload a good number of money right into a bike your particular to out improve. Get extra effective rear sprocket. circulate up 2 teeth at a time. do no longer make huge jumps, in teeth. you will loose genuine speed, yet hill climb gets extra aggressive. Now, to make genuine hill climber you may enlarge the swing arm to 4-6 ft. maximum professionals are working very quickly motorcycles. 2 cycle and changed 4 cycle. incredibly, purely holiday till finally you out improve it and get a extra physically powerful motorbike. 2 tips about a thank you to arise hills, some speed and power, or a brilliant variety of speed and balls out. Watch YouTube movies. you will see.

Have the problem diagnosed properly, there are so many possible causes from something very minor to something worse.

You have not said about abnormal noise from the motor so I assume it sounds good. Not burning oil as you haven't said. it maybe worn piston rings but it could just need a motor tune, I can't give more help without more information from you....

have it checked out by a motorcycle mechanic. sounds like you might need to have a head gasket replaced