[Kj Sulli]

New member. My apologies if this has been covered but I can’t find it.
I have a 2003 crf150f. Bought it used and it ran great. After about a month of continuous riding, it would die after 10 minutes. Wouldn’t start again until it cooled down. Read tons of posts and watched videos.
Replaced ignition coil. Stator. Plug. Cdi box. Cleaned and fresh gas. Cleaned carb and jets.
Now it’s hard as hell to start, and when it does, idles great, for about 3 minutes and dies. Will not start again for several minutes.
Can anyone help me before I just junk it??
Thank you!

[JimDirt]

Welcome to the site !!

It could be any number of things from valves closing up to a clogged fuel vent line , to a stator going bad ........

First thing is to verify it is getting gas to the plug and the plug has spark ... without either or both together , the bike will not run .....

A clean carb does not matter if there is no gas getting where it needs to go , so verify that ..... if you have a good blue spark , then try dipping the tip of the plug in gas , then reinstall it , then try to start it , if it has spark it should either start or try to ...... you need to verify the valves have not closed up or are out of adjustment , that can also cause issues , but usually starting issues but not running then dying issues ... it sounds to me like it is either a fuel starvation issue , or the stator or coil is breaking down/failing .... also make sure the kill switch is not accidentally grounding out while the bike is running , it can happen .... , the gas cap vent line can get mud daubers in it , they like to lay in holes , if that is the case the line may be plugged causing a vapor lock issue .... which will happen after running for a few

That is where I would start , eliminate each item , then move on till you have confirmed everything is as it should be , then report back with what you found ........

[Back2-2]

I'm with Jim on some of the recommendations. We you described could be a stator going bad. Seems Honda does not build them like they use to...If it is it will get to point where if it does start it will run horrible.
Also as Jim said - Clogged or failed vent check valve in the cap or one of the after market vent line valves can stick.
Try loosening / opening the gas cap for a couple minutes when it quits running on you and see if that lets the tank vent and refill the carb.