Newbie air pressure question

I didn't know until yesterday that the front forks on my 650 had air pressure inlets. I put about 20 lbs each into them, and now the Diving is gone. What pressure is suggested by you guys, especially for a Large sized rider?

Also, is there a way to connect the two forks together air-wise so the pressure is always the same in both forks? Is it even necessary?

thanks...

 

17lb is the maximum pressure.
0 is the minimum.

Too much pressure can damage the fork seals.
Unnecessary to link.

Are you sure you have an 81? Or has the front end been replaced? The air assist shocks didn't show up until 82.

 

If you load a 7 gallon, portable air tank with 20 LBS, you will put in the same amount to both sides, as the volume in the forks is tiny.

 

hmm. well, it was made in 81, and it's got a YICS engine, so am i safe in assuming it's an 82 model?

 

Probably an 82. What does the title say?

 

No title, a freebie from a friend. In New Hamster, anything over 20 years old doesn't require a title. He gave me the bike, said " It used to run" and tossed me the keys...Runs fine now, and I should have it registered this week....

 

I had my forks re-done by the Yamaha dealer and they said the book is wrong about the 17 lbs.

It should be 0-5 lbs. max.

Only use a hand pump (bicycle, football type) do it slowly and must be within 1/2 lb per side.

 

I have about 13lbs in my seca forks.
Dont think your model even had air assist, but then again the switch between the bikes is quite common.

 

If it's got air-assist shocks, and a YICS engine, then it's a 1982 model

 

I'll back Altus up, it's got to be an 82. And I wouldn't run more than a few psi in those forks, blown seals suck. Balancing the pressure is a bit tricky, you could always look into the fittings from a turbo bike, my 82 front end has a balancing hose.

 

I've got the '82 XJ650Rj, yours is the 750.
I've looked in the manual, up and down the forks but can find no "nipple" for air input.
Were would they be located if I have them?

 

mine are at the top of the forks, under black caps that say adjust or something ike that...

 

ahpook, you can tell for sure if yours is an '82 XJ650 Maxim by a quick look at the stamp on the engine (right side). If it says "5N8-xxxxxx" (where xxxxxx is just six digits), then it's definitely an '82 XJ650 Maxim. I have two of them.

Of course, NEITHER of my 650s has the air assist nipples on the fork tubes, but that's because my bikes have had strange and interesting things done to them (poor babies!). They are SUPPOSED to be there.

 

Near the upper triple tree clamp. Should be a Schreader(sp) valve

 

Thanks

 

mine are under chrome caps that unscrew to reveal the valves on my 85' the service manual says standard psi 5.7 lbs 0-minimum and 17max and to have the bike on center stand with the front tire completely suspended to add or check air pressure. so 20 with the wheel on the ground may not be too far off.