number on top of piston

[nutting741]

hey im sorry if this is a question that is commonly asked and i didnt dig deep enough but any help will be greatly appreciate. ok i bent a connecting rod on my banshee and when i took off the head and cylinder walls i cant tell if the top end has been rebuilt before i was told to look on top the pistons at the numbers so i did and the only numbers i could read were 4690c the others were covered under the carbon so does any know what these numbers mean? thanks

[#1JUANstunna]

Part #

 

Is it a wiseco?

[nutting741]

i have no clue man when i bought the banshee i was told it was stock and never been rebuilt

[Larry's Shee]

Need to clean it better, use some carb or brake clean and a scotch brite pad. Dont be to aggressive you'll wipe out numbers.

[nutting741]

ok so just clean it up and what will the numbers under the carbon tell me?

[Larry's Shee]

With the number off the top someone smarter than me will be able to identify them for you. That's how I was able to determine I had Wiesco Blaster style 1st overbore.

[nutting741]

ok thank you and one last question i am at 4900 ft above sea level do you have any idea what jets i should be using for that and it also has fmf gold series pipes and v force III reids in it and do you know the stock length of the connecting rods

[elev8ted]

ok thank you and one last question i am at 4900 ft above sea level do you have any idea what jets i should be using for that and it also has fmf gold series pipes and v force III reids in it and do you know the stock length of the connecting rods

 

 

I have a ported and polished banshee with v-force reeds, k&n pods and t-5s and run a 360 main, raised the needle 1 clip and a 35 pilot. I am at 2000 feet. The rule of thumb is to reduce 1 size jet for every 500 feet of elevation if that helps