what fork oil

just wondering what weight fork oil you guys would use on 79 or/cr/wr 390 fitted with 83 40mm forks,i hav some 5w putoline , but spec list something like 10/30 ?

I would go by your weight and riding style. Heavier rider or more aggresive heavier oil weight.

I am sure you want heavier oil than 5W. I ran 10 or 15 W in the forks on my 84 250. Give Charlie Preston a call, he will tell you for sure, but I am positive 5W is too thin.

yep

i think so too just what i found in shed,thats why havnt yet filled them up will give him a call and see what he has to say.

I use to run ATF in my 79 -81 Husky's.. That info came from DB himself.. Also never seen a leaking fork seal either...

Chow, Carl

I'm running 550 ml of 15w (per fork) in my 84 WR. Seems good but I think I'm going to back off to 500 ml because the very last bit of travel is very firm. 500ml in a WR fork is about 6 inches from the top with no spring and fully compressed. If you have CR/XC forks, I can't tell you how much to use. Oh yea, I weigh 175 lbs and am an intermediate rider.

Tom

Dirt Bike magazine used to suggest blending 10wt and 15wt together (12.5wt?) for 40mm Husky forks. I believe I read somewhere that AFT is equal to 10wt.