What weight fork oil

Hi,

You need stiffer springs but yes a 5wt fork oil will work fine. To stiffen up the suspension with just fluid and not changing springs is not really the correct solution to your issue. If you are not able to locate stiffer springs send me a PM and I will see if I can help you with that.

Terry

Like Terry said, springs are the best (some would say "only") solution, especially on an EXC. If you are going to the trouble of being inside your forks anyway, source some springs and do it all at once. Preloaded isn't the answer either so even adding spacers to your existing springs should just be skipped. Should be able to track down springs for those forks. Even if you can't find the crazy stiff ones, the stock spring weight from the mx bikes would be a vast improvement over the EXC springs which are the softest of the models.