you apply oil to the suspension area and then push it up and down to work the oil in.
To add fork oil to the front fork of a 1981 Yamaha 550 Seca, first, remove the front wheel and the fork tubes from the bike. Then, remove the fork caps and drain any old oil. Using a funnel, carefully pour the recommended type and amount of fork oil into each fork tube. Finally, reassemble the forks, ensuring all components are tightened properly before reinstalling them on the motorcycle.
440 cc
300 ml
qt fork oil and type oil for the front fork on each side
120mm level
the front fork oil leval is to be set at 130mm from the top of the fork (air gap)..with the fork spring out ..and the fork fully collapsed ....
fork oil amounts for a Yamaha GT 80 are 108 to 116cc's per fork tube. you should use 10w motorcycle fork oil. this is good for all years from 1974 to 1980.
Each front fork holds: 400cm3 or 14.1 oz or 13.5 US oz.
I like 13 to15psi
At the bottom of each fork there is a hex head bolt, metric I think # 8 Be careful not to strip it.
7.8 oz. of 10wt fork oil
To service the front forks on a 1982 Yamaha Virago, start by removing the front wheel and brake calipers, then loosen the fork clamps at the triple tree. Next, drain the old fork oil by removing the fork caps and sliding the forks out of the triple tree. Clean the fork tubes and inspect seals for wear; replace them if necessary. Finally, refill with the appropriate type and amount of fork oil, reassemble the forks, and ensure all components are securely tightened.