Yamaha ttr90 no spark

SOURCE: 200 YAMAHA V-STAR 650 HAS

IT sounds like it is the pickups not working (.telling it to spark) if not then it will be CDI UNIT OR ENGINE GENERATOR COILS

SOURCE: My yamaha ttr90 wiring

you should be able to repair the harness just solder the wires and heatshrink the connection
the new harness costs
see pic
WIRE HARNESS ASSY
(5HN8)299268-001 $6.85

SOURCE: i have a 2004 ttr yamaha 225 dirt bike and theres no spark too p

check stator ac output 1st.check pulse coil next. find cdi box to try next.other possibles- ign coil, try unscrewing plug cap & trimming about 1/4" off coil wire. check spark w/ cap off. finally could be wiring.

SOURCE: Honda CRF150F will not start

ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ). Flush out the gas tank if needed.

Drain the carburetor. There should be a screw on the lower side or bottom of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. Post a comment to get back to me.

A “very helpful” rating on this answer? Thanks!

SOURCE: 2000 yamaha ttr90 fuel leaking out overflow tube

your float is stuck take carburator off and clean wiggle float and it shouldnt leak gas anymore