Hyo GT250R Front Fork | GTAMotorcycle.com

Hyo GT250R Front Fork

D

dan.the.man

Member
Hi,

So the front fork on my 2009 Hyosung gt250r is soft as hot butter. Google tells me to try a heavier oil, some people said that didn't do much. Others say to swap the stock springs for RaceTech GT650 springs. Another option seems to be adding a spacer at the top of the spring, but that just increases the pre-load, doesn't actually stiffen the spring.

Thoughts?

What can I do without taking the forks apart and replacing the spring?

Dan
 
Not much. Front end needs to come out to service it.

I have put in heavier oil for a forum member - he seemed to like it. All heavier oil does for the most part is slows everything down.

The spacers on top - I guess its a decent way to increase preload.

If I recall - I don't think the hyo's front forks had any type of damping rod. (might be wrong its been 2+yrs)
 
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Save your money for a bike with better suspension :/ Only partly kidding. Hyo 250's don't seem to last that long, dumping money into them probably isn't the best plan. Heavier oil is cheap and shouldn't hurt, so you could try it in the meantime.
 
i put heavier oil in mine and it was a night and day difference with the bike, the stock oil is light weight and mine weren't even filled fully.
 
Just drop in better springs... like Progressive. It's a $125 investment, not exactly breaking the bank. It will significantly improve the front end.
 
I see this advice quite often and I think it's important to know what you're actually doing ... sometimes it may still be the right answer.

Heavier fork oil: Increases damping of the forks. This sounds obvious, but your bike has damper rod forks - it works by forcing oil through holes of a fixed size at the bottom of the rod. The greater the force on the fork (the faster it is trying to move) the greater the resistance. What most people notice & complain about with damper rod forks is that they are not very good at damping slow-speed movements such as compression under braking. When you increase the oil weight to correct this, though, you are probably trading away the fork's ability to deal with bumps and irregularities in the road.

Heavier springs: This is more complicated, and in fact is often not a bad idea since North American riders are usually heavier than what the target rider weight of a given bike was. Assuming sag and preload are set up correctly before and after, though, heavier springs will mean the suspension will travel less for a given force. If the springs are too soft, the suspension will bottom out, but if they are too stiff, the suspension will not be able to travel enough to do its job.

ALSO: Racetech recommends springs and oil weight based on the assumption that you are also using their fork emulators. For bikes that DON'T have them, the springs will probably be too soft and the oil too heavy.
 
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