Sputtering at mid to high RPM

[2000]

And the screws heads where stripped on the plastic needle piece

 

[YAMAHAULER]

Yep they usually are

 

[2000]

Ok so I tried a 147.5, 150, 152.5, and a 155 main with no luck. So I just bought a zoom zoom carb and it runs like a top. I put the 42.5 pilot and 150 main in it. How exactly do you do a plug chop? I know it involves cutting the plugs and running at full throttle. Does it matter which gear? and I will do a 1/4 throttle plug chop as well.

The left plug is a new one and the one on the right is a plug I ran for few minutes at about 1/2 throttle.

 

[2000]

Ok so I put a 155 main and a 45 pilot jet and it runs fine and here is the plug after 5-10 minutes of running it around the yard in 1-2 gear.

 

[YAMAHAULER]

Looks good!

 

[2000]

Great. Finally that's over! I almost didn't put the 155 in it but glad I did. Thanks for all the help! I made a video on how to jet it and will post it in tutorials do you know how to make it a sticky ?

 

[YAMAHAULER]

The mods will have to make it a sticky

 

[2000]

So hears the plug after about 6 hours of riding. Is it supposed to stay tan or get black?

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[YAMAHAULER]

If all 3 circuits are jetted correctly yes it should stay brown
What throttle range were you running it at most of the time?

 

[2000]

1/4 throttle to 1/2 and occasionally 3/4 throttle

 

[YAMAHAULER]

OK what notch is the clip in on the needle?

 

[2000]

What ever stock is. Isn't stock like 3rd notch?

 

[YAMAHAULER]

Yep 3rd notch down from top
If it ran great throughout the throttle range without any bog or studdering than its fine it's actually better to be a tad rich than lean

 

[2000]

Yep 3rd notch down from top
If it ran great throughout the throttle range without any bog or studdering than its fine it's actually better to be a tad rich than lean

It ran great. No sputtering or bogging at all. I think I will leave it then. Thanks for the help