250 died on me today. what happened?

i had just gotten back from an hour of riding and my step-brother comes out with his new pipe on his yz125 begging for me to come out again with him so he can try it out. so i go along and down the trail the thing starts loading up on me but when i hit the gas it bogged. i come to a stop and it wont start. i let it sit for 2 minutes, kick it and it runs fine for about 5 minutes then begins to do the same thing. so i decide im gonna head home. it runs fine for another 300 feet then finally loads up, bogs and dies and i had to be towed home by a quad via an old hose.

what gives? it's almost doing the same thing it did when my carb was clogged. good gas. sketchy pre-mix (halvoline tw-3) but seems okay. what are the causes for loading up and bogging like that? it was just sitting there and idling like BWA BWA BWA BWA BWA. then when id hit the gas GURGLE BLEHHHH dead. :thumbsup:

sounds like plugged jets

you ran out of gas! No seriously, re-check the carb.

Put in a new plug, check the carb again and then if that dosen't work unhook the kill button, sometimes they cause trouble. Is the compression good? A fouled plug will do that sometimes so try that. Ed

I would also say fouled plug. I know my 2 strokes were always touchy on what kind of gas and premix I used. Once I found a combo that worked I would stick to it. Otherwise you will foul plugs all the time. One thing that always worked for me was half race gas half super unleaded.

I would also say fouled plug. I know my 2 strokes were always touchy on what kind of gas and premix I used. Once I found a combo that worked I would stick to it. Otherwise you will foul plugs all the time. One thing that always worked for me was half race gas half super unleaded.

I believe your supposed to JET the carb!

well ya that to

plugs gonna be the first thing i check. but usually when i foul a plug it just dies. ive never seen it load up and ping so loudly.

Pinging and loading up, maybe bad gas, water and oil steetling to the bottom of the tank and trying to keep running. Or maybe the black box going bad. Just some thoughts. Good luck Ed

i would check the carb, then check compression

i had the same problem. turns out my main jet fell out into the bottom of my float bowl.

i was having similar problems with my 250, mine would load up when your not on the gas and the plug would foul, I did my reeds and it ran perfect after that, i used Boyesen power reeds

If it was running fine before, I would suspect either something broke (reeds,etc.) or something got clogged (jets, plug). I wouldn't change any settings to compensate for it. Start at the airbox and work your way in.

one time me and my friend went riding and the same thing happened to his 99 yz250. Turns out a small fall earlyer caused the spring holding the exaust tight against the engine fell off and the exaust gasses were leaving directly out of the engine. When that happened his plug fouled so even after we fixed it it wouldnt run. but i dont really know much about 2 strokes so i dont really know.

I would check all the same things these guys said and if you still have the same problem I would unfortunately suspect a serious problem with the cylinder and piston. I had a buddy that had the same thing happening to his TM and when all was said and done he got home pulled the pipe to look and sure enough the piston had pertty much exploded the skirt and destroyed the cylinder wall. But he ended up not having hardly any compression either. So if you still have good compression that is probably not the case.

found the problem. totally gunked and clogged petcock/fuel filter. took it out, bathed it in carb cleaner. added some carb cleaner to a new tank and its running crisper than ever before.

It always seems to be the dumbest things eh?:thumbsup: or the things you would never think to check..

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By luke8500
      Hi all,
      I have a 2004 Kawasaki kx250 that died suddenly on me the other day. all i can get it to do is backfire every once in awhile. Tested the resistance and everything of the magneto and stator with a multi-meter and all is good.  Coil is new oem Kawasaki the reeds are brand new vforce and the top end and carb have been completely rebuilt.  key on crank is intact and all the timing marks are lined up. I hooked a timing light to it and spun the motor over really fast and found that it is sparking way to late.  The service manual says that it is supposed to fire 14 degrees before TDC but it is sparking way after TDC.  Im thinking its a fried CDI box since its the only thing i wasnt able to check.  Any help would be appreciated
    • By luke8500
      Hi all,
      I have a 2004 kx 250 2 stroke and it wont start.  it only backfires.  I was out riding it one day and came up to a stop so the bike was just idling and it started to try and die so i revved it up a few times then let it die and now it wont start back up.  It only pops or backfires when you kick it.  Its getting good spark and i just put a brand new plug and coil in it. I took the reeds apart and they look like they're brand new.  It was running great before so i dont know what happened.  Im thinking it could be a fuel problem even tho the plug is a little wet if you take it out after a bunch of kicking.  Any help would be greatly appreciated 
    • By Zach121
      Alright, found three bikes all located where i live in Texas. I know they're all very different, but if you could tell me what you think each bike is worth, and which one would be the best deal. Thanks.
      Notes: Both 2 strokes have new top ends. I think the front brake lever is broken on the kawasaki.
      KX250 2002 $800-$1000?

      YZ125 2000 $1250

      KTM 400SX 2002 $1200

    • By Ryan Turner
      So I'm at a bit of a cross roads, I currently own a 06 rm250 and I love it. I also have a 02 kx250 which I'm selling with intent to buy a newer two stroke. I can't afford a newer ktm and the older ones aren't that great and kawasaki never impressed me. so I'm stuck between 06 yz250 and 05 cr250. I've heard the yz and rm after 06 are almost the same bike just the Suzuki handles better and the Yamaha has better suspension. So I'm not sure if I wanna buy carbon copy of my bike with slight differences. That's why I'm interested in a cr250 I heard the 02+ models RC valves are shit garbage but was mostly fixed in the 05-07 models. I ride at a track and at some bogs down the road from me. So from people who have owned both, what would you recommend. I know the cr is known for a hard hitting power band which I enjoy since im an aggressive rider. Should i just see which deal comes my way first.
    • By dirtbikesrule
      If you own a 2 stroke dirtbike,please reply once. Im just wondering how many people on this site have them.