hello<br /> before any other trouble shooting a spark test ans a compression test is mandatory. this allows to confirm the integrity of the ign system and cyl sealing ability before condeming the fuel system, under the yamaha forum there is some info on making a spark tester posted to badbass. if the ign system is working and the engine is not mechanically damaged start looking at fuel systems. most times it will be bad carbs or leaking fuel pump.verify spark and compression first and post us back.
