150cc Stock Jet size? By mapbike (Read 3,419 times)

[mapbike]

I have a MC-74-150 Scoot and I would like to know what the stock jet size normally is in these GY6 150cc engines.

I plan to put a better flowing exhaust on it and I know this will lean the mixture out some so I plan to rejet the carb. I have looked at the replacement jets and am not sure what to get since I dont even know what size these engine typically come with.

Thanks in advance for any & all help on this.

Peace

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[Bashan]

They usually come with a 104. I get my jets from MonsterGY6. I'm sure the other vendors sell good stuff but Steven's are always perfect and a sturdy bronze/brass. I'd start with a 110 and see how it does. Go ahead and get 4 or five of them close together, you're probably going to need 110, 112, 115 and 120. 125 and up start needing some serious fuel delivery capabilities. Rich

[mapbike]

Thank you sir I will do that, I'm not looking to go all out with my scoot but I would like to get a bit more pulling power out of it on top end, I live 16 miles from my work and 1/3 of that is actual highway driving before I get to town with a couple very minor hills, right now I'm topping out at 57-58MPH on the flat ( no head wind ) and I loose about 10-12MPH on those slight inclines, I want to pull through the wind a little better and do a bit better on those hills also.

I figured if I free up the exhaust a bit that should help some, I already put the Hotter Coil, (Orange) CDI, Spark plug, variator, 13g sliders on the scoot, all of this really hasn't made that much of a noticable difference maybe just a bit better low end take off but thats about it.

So looks like I need to get into things a bit more