ZXR250c hard starting etc

[skidMark]

i would still run an airbox of a sort but not the factory ones....pod filters with a shround to protet from engine heat then ducted to the piping/ ram air of the left fairing.... or i would use the pipes on top of the tank and set them up for actual ram air, and relocate the reg/rec so it still gets cooled.

[imdying]

On an unfaired bike it'll make more power with a pod filter or open carbs until about 150kph.

Gross generalisation that basically is incorrect.

It's common practice on certain bikes to drill holes the the airbox lid to get some extra flow and run a pod filter mounted inside them.

What is this 1985?

I run a pod an no airbox on my cb250rs.

Oh, it is... as you were

[fricks]

Problem is back. First post updated with new info

[FruitLooPs]

If you can get it running on three for a period of time you can try splash some water on the headers which will narrow down to the bad cylinder for you.

My friends zxr250a is a pig in winter, takes quite a lot to start it and has changed the battery at least once and left the bike at home each winter for a day here and there when he cant get it started. A few times it wouldn't start without a push start on gas that was in the tank for a few weeks. New plugs normally set him right for a while, but the bikes seem very sensitive to cold and a less than perfect battery.

Good spot on the fuel filter, there are a few out there that are too restrictive.

I guess its possible they run quite a rich mixture from factory, and combined with extra choke on cold mornings and carbon coated plugs you might get inconsistent running and jerking if it fires on it some of the time.

I know i've had my 2-stroke single run with a pretty fouled plug for a few 100m with almost zero response before it finally coughed and died. In the weeks prior to that it had lagged off the line quite a lot, and needed quite a bit of nursing. New plug and it was great again, but then again its 2T so has oil to foul with too