Sounds like the Floats in the Carburetor are stuck causing the Needle Valve to be stuck in the open position.
(OR the floats have failed. Replace them.)
This will happen if the bike has not been run in a while. The gas goes bad and gums up the Carb. The carb needs to be taken off & disassembled and cleaned with a suitable cleaner like B-12 from auto parts dealer. When gas goes bad, it has a distinct smell.
SOURCE: yz 250 wont kick start
Hi andersondts.
To get you right there i believe it should read as 'jump' start and not 'bump' start ...:-)
Well the problem could be with the battery, is it a maintenance free (dry) or is it a wet 0ne (uses sulphuric acid specific gravity 1250).
( 1) How old is the battery?
( 2) If its a wet one ,check the specific gravity of the acid in it, if its low thn charge it.You may hve to add or top up to its required level , if so thn use distilled water only !
( 3) If the battery is more thn 17months old ...replace it.
( 4) Its not bad to get the charging rate of your bike to make sure that it is working properly as required.
I hope this will help.
GOOD -LUCK.
Knight.
SOURCE: yz 250 1992 wont kick start
check your compression I had a 94 yz that done that when i checked the compression it was really low so I put new rings on the piston and that's all it took to bring her back to life
SOURCE: i have a 1991 yamaha yz 250 it starts then shuts off
change the pkug first buy a br8eg plug off ebay and see how this goes get back to me also are you using the choke on start up
SOURCE: the yz 250 1986 has the same engine as the tri z
im not that good with carborators so any help will be great .
SOURCE: my yz 250 is leaking alot of gear oil when it is
the problem you have is the water pump bearing worn you need to replace the impelar bearing and seal
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