Fork oil, need input.(gsx400e)

[Runeight]

1982 GSX400E(Z), Canadian model.

Need fork oil quantity, both left and right. Getting conflicting numbers dependent on where I look. One service book states 187 cc left, 165 cc right. Have a owners manual for 1983 model that is completely different. Maybe someone has a 1982 owners manual?

Currently 150 cc in them now. Where I got that figure has escaped this feeble mind. Forks are mounted but easy to fill if I remove handlebars.

TIA.

 

[Nessism]

Oil volume is not overly critical as long as enough oil is used to cover the damper passages. Beyond this the amount of oil affects the amount of trapped air in the fork leg, with more oil meaning less air, and thus during compression the smaller air passage will increase in pressure more than a fork with more air.

If you remove the springs and compress the forks all the way, how far from the top of the forks is the oil? 6-7 inches is a safe number.

 

[tkent02]

If you remove the springs and compress the forks all the way, how far from the top of the forks is the oil? 6-7 inches is a safe number.

This distance must be identical on both fork legs, the exact quantity of oil it takes to do this is of no concern.

 

[Runeight]

Looking for a cc meausurment as I won't be pulling the forks off and/or removing the springs. According to my cup I'm off 1 1/4 oz on one side and a little over 1/2 oz on the other if reading the proper book.

Thankss guys.

 

[Nessism]

You don't need to remove the forks to measure oil level.

 

[Runeight]

You don't need to remove the forks to measure oil level.

I understand this. All I am looking for is the quantity, in cc, per tube as stated in the first post. Not rocket science here.

 

[Guest]

I've always used 150cc of 15wt; seems to work. The factory suggests a 50/50 mix of 10w30 and ATF, but maybe that's why the magazine tests whined about the mushy forks.

The factory GSX manual says 148ccs. They also state the 'oil level' as 198mm - presumably from the top with the spring out and the leg compressed.

Sounds like you're just about ready to go for a spin?.??

 

[tkent02]

Again, the quantity is not important, the level is. Not rocket science here.

 

[Gorminrider]

umm. I've been tricked by this bike before. It's a little different than my '81s. The Haynes has a picture of your bike on the cover and an addendum describing differences between your bike and earlier models (my bike)

From the Haynes manual =GSX models EZ,ED the capacity is 178 cc (6.0 us fluid oz) each leg
oil level (EZ,ED) is 131 mm

also recommends 15w fork oil and 7psi air pressure

 

[Runeight]

I've always used 150cc of 15wt; seems to work. The factory suggests a 50/50 mix of 10w30 and ATF, but maybe that's why the magazine tests whined about the mushy forks.

The factory GSX manual says 148ccs. They also state the 'oil level' as 198mm - presumably from the top with the spring out and the leg compressed.

Sounds like you're just about ready to go for a spin?.??

OK, 150 is what I put in. (Still don't know where I came up with that) Shop book (Haynes) is different then owners manual. (For 1983 model)

Owners manual (1983) says 206 cc for left, 186 for right. (Canadian model) Quite the difference.

This is where the confusion comes in. Currently no air in them so I don't know what your opinion is of this. Calls for air however.

No, not close. Busy times here as the other half went into renal failure and is on dialysis. Keeping up with the house, shopping and three visits a week leaves little time.

Carburetors not done, paint not done and my "special package", which was ordered May 12, has not yet shipped. I paid for it but nothing yet. I would like to get it running off a IV bottle but won't put gas in the tank until late September.

 

[Runeight]

umm. I've been tricked by this bike before. It's a little different than my '81s. The Haynes has a picture of your bike on the cover and an addendum describing differences between your bike and earlier models (my bike)

From the Haynes manual =GSX models EZ,ED the capacity is 178 cc (6.0 us fluid oz) each leg
oil level (EZ,ED) is 131 mm

also recommends 15w fork oil and 7psi air pressure

....and my Haynes book has different meausurment as in first post. 7 psi you say? Better write that down.

 

[Runeight]

....and my Haynes book has different meausurment as in first post. 7 psi you say? Better write that down.

Look in chapter 7, page 190. It's an addendum to the rest of the book. (Haynes manual)

 

[tkent02]

You can lead a horse to water but you can't make him think.

 

[Runeight]

You can lead a horse to water but you can't make him think.

That is correct.

Back in the day do you think a Dealer would do that? I would say no. Drain in the bottom, fill the top with fresh.

 

[Guest]

....and my Haynes book has different meausurment as in first post. 7 psi you say? Better write that down.

Good luck with the air. On mine you have to remove the handlebars to add air?

I think they decided to add some air spring so they upped the oil capacity to shorten the chamber and put air caps on, but never actually thought it through. I think the original suspension setup was for a 125 lb Japanese guy delivering noodles in Tokyo in the winter.

I had my '79 set up with about 2" cut off the springs and 2" PVC spacers; 6 oz of 20 wt fork oil. Ready for Mexico.

My '82 has 15 wt 150cc and no air. It's a little low and soft, but I'm older now. When I consider that a Marzocchi mountain bike fork [same basic design] has 35psi per leg and weighs about 200 with me on it, 7 psi on a 600 lb combo won't do much. It's just a trim adjustment. Usually varying degrees of temporary.

 

[tkent02]

That is correct.

Back in the day do you think a Dealer would do that? I would say no. Drain in the bottom, fill the top with fresh.

Dealers left fork caps loose, sold bikes with wrong sized wheel bearings, put in the wrong valve shims, left oil drain plugs loose. Just the other day I found several loose screws and bolts on a brand new 2016 bike... which hadn't even been ridden yet. Doesn't mean I'm going to, but feel free to do as you please. You're the one who has to ride it.

 

[Runeight]

Good luck with the air. On mine you have to remove the handlebars to add air?

My '82 has 15 wt 150cc and no air. It's a little low and soft, but I'm older now. When I consider that a Marzocchi mountain bike fork [same basic design] has 35psi per leg and weighs about 200 with me on it, 7 psi on a 600 lb combo won't do much. It's just a trim adjustment. Usually varying degrees of temporary.

Agree with a little soft. No problem with handlebars, bike on lift. Thanks for the input.

 

[Runeight]

Dealers left fork caps loose, sold bikes with wrong sized wheel bearings, put in the wrong valve shims, left oil drain plugs loose. Just the other day I found several loose screws and bolts on a brand new 2016 bike... which hadn't even been ridden yet. Doesn't mean I'm going to, but feel free to do as you please. You're the one who has to ride it.

Tom, you are correct on sloppy work by Dealers as I have seen this also. I'll bet Dealers never measured down the tubes but rather fill a cup, pour it in, cap it and over charge the work. Didn't matter if it was correct.

I have rebuilt many a motorcycle, one of which was many upgrades on a 2003 Hayabusa. I ran that bike up to 155 mph before backing off. It was only at 7700 rpm. I had it geared for 200 but chickened out. Sure it would of done it too. Speed was verified by GPS. So to your remark I am the one who rides it and not afraid to do so.

All I wanted out of this thread was a liquid meausurment not a proper way to measure it.

 

[Nessism]

The issue here is that splitting hairs on the oil fill quantity adds no value to your build. You are simply blindly following Suzuki's lead, whether it was well considered or otherwise.

 

[Runeight]

The issue here is that splitting hairs on the oil fill quantity adds no value to your build. You are simply blindly following Suzuki's lead, whether it was well considered or otherwise.

...and now I'm blind. First I was stupid. Blindly stupid ought to cover it then huh?