Problem with start when engine is hot

Hi, I have problem with my WR 250R from 2008.

Motorcycle start perfect when engine is cold and work few minutes than it turns off.
After that I can`t start it easly or it start but doesnt go on high RPM and shoot in exhaust.
I bought new spark, new ignition coil and check valve clearance.
I don`t have a tachometer in my bike, so i can`t read a error code.

Please help, sorry for my english.

Fuel pump?

I hear fuel pump and I clean fuel filter, but I don`t know what pressure give the pump.
How I can check the pump ?

The fuel pump starts showing problems in hot conditions, so given that it's winter time, fuel pump is probably not the problem.

Have you checked the air filter?

How fresh is your gasoline?

mr_nuke wrote:

I don`t have a tachometer in my bike, so i can`t read a error code.

You mean the display does not work, or has it been completely removed?

First owner removed display completly.
Air filter is also new just like oil filter and oil.
Gasoline has maybe 2 months.

I was riding this bike 2 years with no problem.

mr_nuke wrote:

Hi, I have problem with my WR 250R from 2008.

Motorcycle start perfect when engine is cold and work few minutes than it turns off.
After that I can`t start it easly or it start but doesnt go on high RPM and shoot in exhaust.
I bought new spark, new ignition coil and check valve clearance.
I don`t have a tachometer in my bike, so i can`t read a error code.

Please help, sorry for my english.

Does it run okay with the fuel cap off or at loose? Though it doesn't seem to be common on WRRs some motorcycles are known known for this. Clearing the fuel tank vent fixes it.

-morgan

I will check it.

Also check the fuel filter (part of the fuel pump assembly), or any additional fuel filters the previous owner may have installed.

The problem does not sound electrical in nature, sounds more like the engine is being starved of either fuel or air.