Honda FMX 650 - quantity of hydraulic oil

With the fork springs and spacers removed and the caps off, compress the fork leg all the way down, then fill each leg 6 inches from the top.

Front Fork Oil cc (right leg):170
Front Fork Oil cc (left leg):170
Fork oil grade:10w
Valve Clearance Cold - Inlet:0.08
Valve Clearance Cold - Exhaust:0.08
Engine Oil Grade SAE:10w/30
Engine Oil Classification API:sg
Engine Oil quantity with filter (litres):0.9
Idle Speed (rpm):1400 - 1500
Spark Plugs Gap (mm):0.8 - 0.9
2 Stroke Tank - Litres:No
Float Height:14 mm

Pour the correct quantity of oil into the slider tube.
Technical data Fork oil, capacity per fork leg
0.65 l Consumables/lubricants Hydraulic fluid SAE 10

depends on what terrain you ride on if you want stiffer suspension use 10 wieght softer use 7.5 you can go down to 5 but thats a little lite for a 650

hi,replacing the seal is quite easy,although it will sound complicated,jack up or lift the bike off the ground so that the front wheel is in the air(about 12-14 inches should be enough,remove the front wheel from the bike,remove each fork leg,this is done by undoing the bolts(4 on each leg)the front fork is quite easy to work on just do one at a time,remove the dust cover from the top of the staunchion tube(larger diameter tube),beneath that dust cover you should see a retaining clip that holds the seal in place,remove the retaining clip(and dont lose it),the seal is now ready to remove,the easiest way that i know to do this is to force a screwdriver through the body of the seal,you may need to hit the screwdriver with a hammer as some seal have a tin backing plate,put a hole through the seal on each side of the fork leg taking care not to damage the chrome of the fork leg,then use the screwdriver to lever the seal out of the fork leg,to reinstall the new seal,put a smear of grease or oil around the outside of the new seal,slide the new seal down the fork leg and seat it squarely into the fork tube,very carefully tap the new seal into place being very carefull not to damage the outer surface,i use a small piece of dowell type timber to do this as the wood doesnt damage the seal surface,i use a small ballpeen hammer to tap the wooden dowell,once you have the seal seated down the tube you should be able to see the groove for the retaining clip,reinstall the retaining clip making sure it is seated corectly,replace the dust cover,if you are going to replce the fork oil or top it up do this once the fork leg is back in the bike,repeat the whole procedure for the other fork leg,once you have done the fork seals reinslall the fork legs back into the bike and refit the front wheel,to top up the oil in each leg,simply undo the large cap on the end of the fork leg,you may have to remove the handlebars to do this,be carefull as the cap will be spring loaded and can easily fly off if you are not ready for it,top up or fill with the correct weight oil for your bike(normally a 10w oil),check with your local honda agent for the correct quantity,normally between 400-500 mls,this all sounds quite complicated but is actually quite easy and can be done with a minimal of tools,each fork shold take about 1/2 hr to do...hope this is a help to you

dont use 10 wieght its stiff as can be i recomend 7.5 or 5 wieght but a quart in each fork will do.

hi m8 ,to give u a rough guide,or a maths lesson,,lol,,if u get a half litre bottle, pour half of that bottle in each leg,that is usualy the amount,, or if u can only get 1 litre bottles,, pour a quart in each leg,, leaving u half a litre left,, hope this makes sense ,, if to soft wen you hit the front brake,,then add about 4 egg cup fulls in each leg,,cheers