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My first message on this forum, hello to all! 
I have a Yamaha scooter Majesty 400 and quite a few problems with it. The engine starts, but it stalls and is not receiving the throttle correctly. Also it's not working as expected (irregular work and engine sound also is not as expected and as it used to be). The on-board computer (ECU) diagnostics showed the error code 37 (ISC problems) so I bought a new ISC from boats.net recently, but when it arrived and when I replaced it, nothing changed - the ECU diagnostics still shows the same (and the rest of the engine symptoms are same - stalling and not working properly at all).
Now it also shows the error code 42, the speed sensor. I think I tried all of the fixes and tests that come to my mind, from checking wires to buying new parts, but everything stays the same. Can you please give me some advice on what else to try and what is there to check?
Thank you!!
I have a Yamaha scooter Majesty 400 and quite a few problems with it. The engine starts, but it stalls and is not receiving the throttle correctly. Also it's not working as expected (irregular work and engine sound also is not as expected and as it used to be). The on-board computer (ECU) diagnostics showed the error code 37 (ISC problems) so I bought a new ISC from boats.net recently, but when it arrived and when I replaced it, nothing changed - the ECU diagnostics still shows the same (and the rest of the engine symptoms are same - stalling and not working properly at all).
Now it also shows the error code 42, the speed sensor. I think I tried all of the fixes and tests that come to my mind, from checking wires to buying new parts, but everything stays the same. Can you please give me some advice on what else to try and what is there to check?
Thank you!!
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