Yamaha Dirt Bikes Forum

I am rebuilding the top end on a yz 80 and the jug has a little damage...excuse my terminology but on one of the side intake ports there is a small chip at the top of the port about a .050x .050 peice is chipped out I die penentrant tested the cylinder and there are no crack is this ok?  
97 yz 80..fixin it up for my little bro...HELP!!

Doesn't sound good. Got a pic? if the chip catches the ring ur done. u may be able to smooth it down but it'll most likely give u trouble.  

I concer.  

Yeah I second that  

i dont have a pic im at work..sorry but the chip is smooth it does not protrude into the cylinder any... i cant see how the ring would come into contact with it i have a ball flex hone i wa sjust going to go through the cylinder with that should smooth it more  
97 yz 80..fixin it up for my little bro...HELP!!

Worth a shot. Do a compression check when ur done.  

sounds like a plan smurf! I like doing things the way that doesn't cost any money lol should work. if it doesn't worth a try, and if it does work, you just saved yourself a couple hundred bucks ~pat  
life's a garden, dig it

I like your theory atkkid i only paid $175 for the bike and its way worse that skips project phenix lol but im just tryin to get it running before i pile some money into plastics and all that jazz...  
97 yz 80..fixin it up for my little bro...HELP!!

lol. i agree. its nice to atleast hear things run before you pump a bunch of money into them.  
life's a garden, dig it

yea i was suprised though the cylinder looked really good other than that chip it measured great too but man the bile looks like someone has ridden it to hell and back on a daily bassis the frame was broke up near the seat (how that happens i dont know!!)the water pumps leaking.. it had a big gash up the side of the piston the rear brake lever hole in the frame is like wallered out (dunno how im goin to fix that yet) all the plastics are cracked or have been painted...its  rough  
97 yz 80..fixin it up for my little bro...HELP!!

I got some water down in the crankcase i took the drain plug out but its still in there down around where the crank is neone know how i can get that out??  
97 yz 80..fixin it up for my little bro...HELP!!

you can split the casings. which suckssss. and takes a while. or you cand drain as best as you can. strip the motor down as best as you can. and tip it on one side. maybe airing it out with an air compressor after maybe like 6 hours? then another 6. should be dry then. ~pat i've had a swamped bike before and it sucks. sympathy is with you man lol  
life's a garden, dig it

Smurf07:
yea i was suprised though the cylinder looked really good other than that chip it measured great too but man the bile looks like someone has ridden it to hell and back on a daily bassis the frame was broke up near the seat (how that happens i dont know!!)the water pumps leaking.. it had a big gash up the side of the piston the rear brake lever hole in the frame is like wallered out (dunno how im goin to fix that yet) all the plastics are cracked or have been painted...its  rough

Where was the chunk of metal that came from teh chip? I'll bet that gouged your piston. to fix your "brake lever hole" i'm assuming this is where the bolt goes in. and its stripped? You could get a longer bolt. with a nut on the end. to hold it on there. Or you could re thread it with a threading bit. and get a larger diameter bolt. I would just use a longer bolt with a nut on the end if there is space permitting it. frame break up can be caused by over jumping it. right there near the seat. ~pat  
life's a garden, dig it