I HAVE AN 85 ATC..... I GOT IT AND IT IS IN PERFECT CONDITION... I BOUGHT IT FROM SUM RICH DUDE AND HE ONLY RODE IT ONCE ADN HE HAD SUM GEARS PUT IN IT OR SUMTHIN I DUNNO.. IT TOPS OUT AT 75MPH, I HAVE BEEN USING 20:1 RATIO BECASUE THAT IS WUT THE STICKER SAYS, BUT PEOPLE BEEN TELL IN ME TO RUN DIFFERNT TYPES BUT I DUNNO WUT TO USE I DUNNO MUCH ABOUT THAT TPE OF STUFF SO IF YOU CAN HELPP ME OUT AND LET ME KNO WUT KIND OF GAS AND OIL TO USE ADN HOW MUCH THAT WOULD BE HELPFULL FOR ME, AND ONE MORE THING I AM LEAKIN OIL FROM MY FRONT SHOCKS, IT HAS TOO SCREWS IN THEM ADN THERE SCREWIN INTO THE BAR AND THE OIL JUST COMES OVER THE TOP OF IT I DON'T HAVE CAPS FOR THEM BUT I DON'T THINK THAT WILL STOP THE OIL FROM COMING OUT, I TIGHTEND THEM BUT STILL HAVE THE PROBLEM ADN DON'T KNO HOW TO CHECK TO SEE IF I AM RUNNING OUT OF SHOCK OIL EITHER?

 

Welcome to the Forums! I would run a 40:1 mix with a good synthetic oil. As far as the forks leaking, I'm not sure where on the forks you are talking about. Are the screws on the top? If so, those are supposed to have air fittings(like a tire) on them. You will need to replace the entire cap. I would get a shop manual and just rebuild them. New seals dust covers and top caps if needed. It is not that expensive and not that hard to do. You can get most of the parts you need at Bikebandit.com or hyperparts.com. God luck!

 

Ive been doing alot of asking about mix and oil myself. Here is what i ended up with on my 250r trx.
oil: Hp Tran Honda
Mix:32:1 Supreme Gas(4gal) / Castor Pro series 927 (1 bottle)

 

i run a 40:1 in my race motor. make sure and get good oil tho, no autozone cheap stuff. run 91 octane or better, i run 104, but you might need to tune your carb fr it.

 

We have a big group of Central Cali riders over at 3wheeler.org

 

klotz oil --you are runin 20:1? sounds like a air cooled 250r if so you need more oil than water cooled bikes (the air cooled run hotter they need more lubrication)
id say try 32:1 klotz thats what i run in my air cooled kx

forks--new seals and oil
buy a clymer manuel it will help you a lot if you read it

85 should be water cooled

 

20:1 is more oil than 32:1, WTF are You saying ?

 

20:1 is more than 32:1
32:1 is more than 40:1
bikes are rich from factory so people do not blow them up
it depends on how the person rides!!!!( if you ride hard you need more lubrication)
but your spark plug should be (tan -or golden brown) either way-(propper premix and jetting)
if you mix too much oil--- you have too much oil
bigger jets will not compensate for too much oil!!!!
--because oil is mixed with the fuel in the carb
it will load up on bolth - fuel and oil
unless the machene is oil injected/and then the injectors or cables are adjustable