It doesn't look blown from those pictures, just coked all the pieces....
Coking is what happens when the oil and gasoline aren't burning efficiently and they leave deposits. Some deposits are normal and if that engine has been together for a handful of years, that's about right. If it's not been together very long at all, that's abnormal.
Why was the engine torn down?
because i was riding it and had a known airleak.(i know im a dumbass) and then i heard some loud knocking and it died and wouldnt start back up so i figured blown motor?
is the bore still good?
well as far as i can tell it is i cant feel any scrathes or anything there is some lines that run up the cylinder but when i use my magnifiing glass its just on the surface. only thing with the cylinder is the ports looked caked with black gunk:-/
from those pictures, it's not "blown" in the normal context. Knocking with an airleak is usually a sign of a lean condition causing predetonation. That piston looks like it's been getting excessive blow-by while under a rich condition....[/QUOTE what is blow by? and correct if im wrong but lean is to much air and rich is to much gas right? u cant have both can you:-/
from those pictures, it's not "blown" in the normal context. Knocking with an airleak is usually a sign of a lean condition causing predetonation. That piston looks like it's been getting excessive blow-by while under a rich condition....[/QUOTE what is blow by? and correct if im wrong but lean is to much air and rich is to much gas right? u cant have both can you:-/
Yes you can mask an airleak by over jetting!
you should just start fresh, and buy a new piston and send the cylinder to ken for a fresh bore...
only jetting i did was with the air screw. and sorry if this is a dumb question but how do i measure those clearences?
On a side note:
Ken O'Connor isn't the only person who can bore a cylinder.... in fact if you have a decent machine shop locally they can often do a comparable job without the shipping costs. Don't get me wrong, he does a good job but including shipping both ways, you end up paying nearly double for a bore job!
My local machine shop charges $45 for a bore and has it back in 2-3 days. I recommend finding a local machine shop in your area and mailing a cylinder out only if you cannot find a decent machine shop locally.
lol well when i had to get my cylinder bored for my other blaster my local yamaha dealer charges 90 to bore and cross hatch a cylinder! it was actualy 88.75 but close enoughOn a side note:
Ken O'Connor isn't the only person who can bore a cylinder.... in fact if you have a decent machine shop locally they can often do a comparable job without the shipping costs. Don't get me wrong, he does a good job but including shipping both ways, you end up paying nearly double for a bore job!
My local machine shop charges $45 for a bore and has it back in 2-3 days. I recommend finding a local machine shop in your area and mailing a cylinder out only if you cannot find a decent machine shop locally.