Run a B9ES if you don't have a problem with fouling. If you do have a problem fouling, run a B8ES. Both of these plugs are available at auto parts stores for a few bucks each.
The stock plug was a BR9** - the R indicates a resistor plug which is not needed.
Scott
NGK B9EG is a good start,
but a B10EG is a colder plug for higher reving and racing,
B8EG is the hotter plug for colder weather and low speed
So it will depend a bit on the riding, and the bike tuning,and jetting, when you pull the plug out after riding it should not be white and should not be black, but a tan color in between.
if the 9 is white ,then change to a 10.
if the riding is just idling around and the 9 is black and fouling change to 8(but change back before high speed running).
Sorry if this is all a bit confusing, I usually just put the exact heat range one that came out, unless there is a problem.
SOURCE: 2003 YZ 125 RUNS AND ONLY STAYS IN FIRST GEAR
This is a shift fork or shift drum issue inside the transmission.
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SOURCE: 2003 yahama yz 125 radiator
Google " motorcycle salvage yamaha ". You should be able to find a good used radiator there.
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SOURCE: what spark plug for yz 125?
Hey Ryan, I gotta say "told you so" on the trannie fluid. Go with NGK BR9ES. That is the plug that came in the bike when it was new. As to the clutch plates, you probably can't find just the friction plates. Clutch plates normally come in sets, < pressure plates / friction plates >. If you can find just the friction plates then go for it.
Best wishes, Tombones49
SOURCE: yz 125 99 won't run
You need to ensure for the Carburettor Needle fixed, so that the fuel injected out properly, also if the Crank Gasket should be fitted properly.
SOURCE: 2003 Yamaha 125 yz plug fouls pretty quickly.
Like he said BR8EG runs hotter for yamahas and is bettter because br9eg foul quickly. Use castro in 2 stroke bikes. It runs a little higher because its better
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