How much fork oil do i put in my dirt bike?

I have a 1972 suzuki TS 250 that's stripped down to a dirt bike and my forks started to feel loose so i drained the oil out of them and i don't think its been changed since it was new, i didn't have any fork oil so i put some 10w-40 in it and it worked for for about 3 days and the front is really weak. i didn't no how much to put in so i just put in like 2 cups in each.

i would be suprised if the suspension worked at all with 10w40 in it.. usually they use a 5 wieght or even a 2 weight oil....without knowing the exact spec I would guess around 300-500 cc

You can ruin the forks if you don't put in the correct fork oil, if you haven't already. I use 10 point fork oil in my KX125 and about 500cc in each fork. If you don't know your bike specifications, look at or buy a manual, and properly fix it before you destroy the bike.

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