250sx dies after being held wide open

[beastybaconman]

Got a filter for it, will be getting muffler packing this week. I took it for a spin and pulled the plug, it's brown on top and there's black soot looking stuff around the edge so I think it's running a little rich. I might lean it out a little, but I'd rather have it run too rich instead of too lean.

[beastybaconman]

took her for a spin down the road the other night and it still dies. It runs fine when I'm just putting around doing wheelies but after I hold the throttle constant for a while, like when going down the road, when I let off the rpms drop and it sounds like I'm just coasting in gear, and when I give it throttle nothing happens unless I hold if for a while then the rpms will come back up a little, but it doesn't have the power it should. Once it dies I have to kick it over a bunch before it even fires again so I'm thinking it is either not getting enough fuel and I run the bowl dry, or it is flooding out. I pulled the plug and it looks just like it did before, brown on top and dry black soot around the ring so it looks like it's running a little rich. I know the muffler is supposed to have packing in it, and I'm going to pack it this week, but would the lack of packing cause this problem?

[jakep53]

its definitely not running rich it looks a tad lean but not too bad so I would richen the mixture up a little!!

[beastybaconman]

its definitely not running rich it looks a tad lean but not too bad so I would richen the mixture up a little!!

You're right, guess I'm not too good at reading plugs. I figured out what was wrong, the sediment catch thing on the fuel shut off was all full of crud. It was letting enough fuel in for just banshing around but couldn't supply the carb when going down the road, so it would lean out until it died. Now it runs fine and loves 5th gear wheelies down the road. All I have to do is pack the muffler and it'll be mint, thanks everybody for all the help.

[jakep53]

You're right, guess I'm not too good at reading plugs. I figured out what was wrong, the sediment catch thing on the fuel shut off was all full of crud. It was letting enough fuel in for just banshing around but couldn't supply the carb when going down the road, so it would lean out until it died. Now it runs fine and loves 5th gear wheelies down the road. All I have to do is pack the muffler and it'll be mint, thanks everybody for all the help.

glad you got it all figured out!!

[shortline10]

Post # 8 , I tried to tell you what your issue was in the very beginning of your thread
Glad you got it fixed and can learn from it as well

You're right, guess I'm not too good at reading plugs. I figured out what was wrong, the sediment catch thing on the fuel shut off was all full of crud. It was letting enough fuel in for just banshing around but couldn't supply the carb when going down the road, so it would lean out until it died. Now it runs fine and loves 5th gear wheelies down the road. All I have to do is pack the muffler and it'll be mint, thanks everybody for all the help.