Zong not starting again

[Wild_Alaskan]

It should definitely run with that much compression. Also when you got the new carb are you sure the idle is set open enough? perhaps the adjustment screw is backed out.

[Pabesco]

The valves when checked were always fine and didn't need to be adjusted. They were not tight but within specs.

[Pabesco]

I checked the idle screw when installing the carb and it was ok. The mixture screw I didn't check and will do so in the morning. My main question now is due to the compression reading, wether the bike is starting now or not, would I need th remove and check the head and cylinder and piston?
Thanks guys for the suggestions and information.

[SpudRider]

The compression is slightly higher than the minimum value, but the bike has enough compression to start and run. I would not tear the engine apart. You need to discover why the bike won't start.

The electrical system check outs, and you have good spark. You have adequate compression. Therefore, the problem is either air, or fuel. Both of these components are regulated by the carburetor. I forget; did you install a new carburetor?

Once again, if you need the transportation, I suggest you consider taking the bike to a qualified Yamaha mechanic. The engine and Teikei carburetor in your Zong are virtually identical to the engine and carburetor in a 2013 Yamaha TW200.

Spud

[SpudRider]

Here's one other thing you can try. Remove the spark plug. Put a few drops of oil through the spark plug hole into the cylinder. Install the spark plug, and connect the spark plug wire. Then try starting the bike.

Spud

[Pabesco]

good morning to all, yes it is a new carb. i asked a bit earlier if the carb comes new set to specs or if there is something that needs to be set, i checked the mixture screw and set it all the way in then backed it out two and a half turns.
i will start a new thread because this one is too long, i will post a summery of what was done and tested with all results, is it also possible for the bike to start if i remove the cover for the air filter?

[SpudRider]

Originally Posted by Pabesco

good morning to all, yes it is a new carb. i asked a bit earlier if the carb comes new set to specs or if there is something that needs to be set, i checked the mixture screw and set it all the way in then backed it out two and a half turns.
i will start a new thread because this one is too long, i will post a summery of what was done and tested with all results, is it also possible for the bike to start if i remove the cover for the air filter?

Yes, setting the pilot mixture screw (PMS) at 2.5 turns out is okay. However, setting the PMS at 3.0 turns out might help you get the bike started more easily. You can always adjust the PMS leaner after you get the bike to start. Set the idle speed screw the same as your old carburetor.

Removing the air box cover won't help, but it also won't hurt, as long as you keep the foam air filter in place. I think it's a good idea for you to start a new thread with a summary of the work completed.

Spud