Question about 2003 Yamaha YZ 250
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Bike Backfire And Hard To Start
2000 YZ250 Back fire Yamaha 2 Stroke
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
Posted on Jul 26, 2016
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Posted on Jan 02, 2017
Runs better with choke means the mixture is lean,
Has the exhaust been changed.?
Did this problem just begin.?
Check for air leaks on intake manifold.
Check valve clearances
raise the needle jet one notch
one size up in the main jet.
check one item at a time, and write notes about jetting changes.and improvements
I also run Moreys upper cylnder lube, helps starting hot or cold, and helps stop "cough stopping" with heavy rear brake use
Posted on May 23, 2010
Your plug may be firing in a fouled area. When I have a problem like this, I 1.change the plug. 2. Take the carb and have it cleaned in a sonic bath and my honda dealer(They are the only one with this cleaner in my area) for about $25. 3. Check to insure that the fuel mixture screw is set correctly(about 2.5 turns), and 4.clean the air filter or replace it.
Posted on Aug 28, 2010
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