77 GT 750 with progressive springs

[T350guy]

I just installed new fork seals and I have the Progressive fork springs to go in.What weight of oil is recommended?
My other 77 GT 750 with stock springs I'm using 20wt
Thanks
Ian

[rngdng]

If you like 20W use it again.


Lane

[GT750Battleship]

Hi Ian,how heavy are you ? & what type of riding is the bike subjected to ?,
a lot of guys seem to favour 10W in the GT750 forks,but if you've used something else in the past...& are happy,then stick with it,I'm about to change mine & will go with 10W & see how I like it
Cheers,
Roger

[Cliff]

I'm going to ask the dumb question. What's the difference in the ride between 10w and 20w?

[pearljam724]

World of a difference. Assuming you're average weight. I use 20wt in both GT's with stock springs. Depends what you like too. I like a stiffer suspension because most of my riding consists of switch back roads. Some people like a soft set up for slightly more comfort. Regardless, that wt is a good counter to very soft springs. These bikes corner and brake so much better with a heavier wt oil. The noses dive way too much for my liking using anything thinner. The back end of the bike settles down quite a bit due to forks being stiffer. Ever notice how much the tail end whips if you nudge the bars when moving ? That is minimal, with a stiffer set up. If I had progressive springs set up for my weight though. I'd be inclined to try 15 wt first.

[T350guy]

20wt works good in the other 77 I'm about 190lbs and the rears suspension works fine with my wife on board BUT if I take my oldest son weighing in at about 200
the rear shocks (stock ) are way too soft and bottom out.
The good news on this other 77 someone has installed aftermarket shocks which maybe a lot stiffer .
On this 750 I'm thinking of maybe 15wt with progressive Springs and see how it feels.
Ian