Yz 250 1992 wont kick start

is fuel freely flowing to the carb i.e. is fuel tap blocked

Bad injectors or they are out of adjustment!

FYI to tombones49, you suggested a 32/1 gas oil mix, this bike, however, is a 4 stroke, thus rrequiring no such mixture. Maybe some sleep woulde wise...

VALVES need to be adjusted it propbably pops and back fires when running too

if its a good spark it should start.try bump starting it,if no joy then possibly piston rings or other simalar.

sounds like maybe valves were shimmed too tight,check service manual for clearances...better a little loose than too tight,can cause alot of damage to cam & head,be careful!!

try to change the magnetinc there are 4 or 5 or 6 coil or dynamo one of them is damage

Hi!
You obviously look after your machine and very sensible when laying up, however as you are probably aware 2 strokes rely heavily on compression, A. to produce excellent combustion and B. to draw fuel into the chamber. So when you try kick starting you can't get enough revolutions to draw the correct amount of fuel into the cylinder, where as you push start you constantly turn over the engine increasing compression slightly and bingo it fires.
Can you remember how when kick starting it before this problem the feel on resistance when kicking over? has it now become a lot easier? if so you possibly have worn or broken compression piston rings.
A compression test will reveal this, I hope this sorts your query?
Press the Blue button please for my FREE effort,
Thank You!
Paul 'W' U.K.

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.