Please help! I recently bought a Yz250f and have not been able to start it, it Has spark, but there are many issues with the carby which I wanna rule out before I leap into a rebuild, ( I want to avoid a rebuild if possible as I’m low on cash). The carby at the moment is a complete mess so the usual steps to fixing it might not work. So here’s the deal with the carb:
- It’s leaking fuel from overflow ( really fast! ) and when I mean really fast, I mean it emptied my fuel tank in 2 mins.
- It has a slow leak coming from somewhere under the float bowl
- the air fuel screw is not adjusted correctly
- I don’t know if the electrics work on it either
- I don’t even know if it’s shooting fuel into the cylinder or not, as after kicking it a couple times and it’s not starting I remove the spark plug and it’s still dry. ( I tried putting fuel directly into cylinder from the spark plug hole but the bike still wouldn’t start)
okay so I know it’s a lot but I’m not expecting anyone to answer every single question themselves. If each person could tackle whatever problem they know it would help heaps. Also just want to know what Order to fix things in as I can’t do air fuel until the bike is running and it won’t run unless I stop the leaking and get it to spray fuel into the cylinder. And buying a new carby is not an option ( I’ve got $40 to my name atm). Please help guys thanks.
By Xander Spehar
So I have bought a new FMF Gnarly for my 99 yz250 and it arrived today. Upon inspection I can see plenty of rust on the inside of it, and rubbing my finger on the inside removes small black (assuming metal) fragments. Bit worried to throw it on as sucking rust etc. into my cylinder does not excite me. Should i contact the supplier (don't want to wait/pay more though), clean it myself or put it on and hope it will blow out the crap before it sucks it in ?
The do it all bike doesnt exist, I know that, but Im looking for something pretty damn near close to it. My dilema: I live in Mexico and It is one of the most biodiverse places you can possibly think of; I can ride at 12,000 feet between pines, the next day shred a desert, and the last day be in a tropical forest. Any thoughts on a bike that you may think can handle all of these relatively well?
2006 YZ 250.. The manual calls for 10w30 (yamalube 4 stroke oil), can I use 10w50 (Motul semi sythetic 4 stroke oil) ?? I bought the bike, want to change the gear oil before I ride tomorrow but all I have at the moment is the Motul 10w50 semi synth. Is that oil going to be too thick compared to the 10w30 or will it be fine.. Thanks