plug chop fresh rebuild

[goin hard]

How would I go about determining jet sizes on a fresh rebuild besides plug chopping since your not supposed to go wot right off the bat

 

[007blaster]

What's your mods, exhaust, filter, air temp, elevation? Get us those and we can narrow it down for ya. Look around here too for heat cycles for break ins, there are a lot of opinions out there but I do similar to ken oconnors heat cycles find his vid on youtube

 

[goin hard]

What's your mods, exhaust, filter, air temp, elevation? Get us those and we can narrow it down for ya. Look around here too for heat cycles for break ins, there are a lot of opinions out there but I do similar to ken oconnors heat cycles find his vid on youtube

I have a Vitos 240 big bore kit and a dmc alien exhaust front to back stock mikuni carb stock reed valve

 

[goin hard]

And right now the temp is about mid 30s outside and about 50ft above sea level.humidity around 70%

 

[Larry's Shee]

I would start at 320. Better fouled than fried

 

[goin hard]

Yes very true it'd be about almost a 600 dollar lost if I broke it in lean id rather be fat for the entire brake in period juss so I kno wont score my cylinder and then re adjust my jetting with plug chopping after break in period.

 

[goin hard]

I usually use a extra dab of 2 cycle oil in the premix aswell for added lubrication. I juss want my jetting to be right so i dont fry my piston

 

[Blaaster]

I usually use a extra dab of 2 cycle oil in the premix aswell for added lubrication. I juss want my jetting to be right so i dont fry my piston

Big red flag, NO, NO, NO.

Do not dream of adding extra oil it causes a lean mix, which cause detonation, will run hotter and can damage the piston.

That extra oil takes the place of fuel, for example changing from 32:1 to 25:1 which that extra dab of oil can easily do, will need at least 1 size larger main jet.

One size main jet wrong can be the cooking of a perfectly good motor.

No extra lubrication is provided, it just makes it smoke more!

 

[Larry's Shee]

Well, you're not really going to be in the main jet until the very end of the breakin. And I'll bet the 320 will be close unless it gets colder.