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  1. #1
    Newbie
    Posts
    12

    Front Fork Air Pressure

    So, I got my 82 Suzuki GS850 bike back together after giving it a nice flame paint job. Since I'm a big boy, I adjusted the rear shocks to astiffer setting, and noticed the front forks were at zero for the left side and about 10 for the other left side. Anybody have an idea where they should be? I found a tag under the seat for tire size and air pressure, but not the forks.

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  3. #2
    In Training
    My Bike(s)
    1995 Suzuki RF900r
    Location
    So. FLA
    Posts
    110
    How many left sides do you have? lol...

    According to this website... The GSResources - Gary's Trip to the Smoky Mountains

    ...with an inch of preload, and 10w fork oil, he was able to keep the air pressure at 5-8psi. Now, that may not be saying much, but it's a start...

  4. #3
    Newbie
    Posts
    12
    So, even to compensate for a 400 lb. load (yes, all me, hence my real nickname of Sumoboy) is it still all right to keep the pressure around 10 p.s.i.?

  5. #4
    Lost but forgotten

    My Bike(s)
    2012 Ninja 1000 ABS, 2002 Bandit 1200 S, 2002 Honda XR50R, 1992 Honda CR125R
    Location
    St. Cloud, MN, USA
    Posts
    20,861
    I would keep to the upper limits of the suggested range. I think air pressure has more to do with handling performance than load carrying capacity. Use the spring preload for that, and you may have to upgrade springs.
    'Busa shock, Racetech forks, Holeshot stage 1 & pipe, Hella headlights, CBRXX clipons, Givi E360 & V46, Zumo 550, Pilot Road 2CTs | Symtec grip heat
    Arai Signet GTR | Joe Rocket Meteor boots, Alter Ego pants, jacket
    | Gerbings liner | Alpinestars SP-1 gloves | Hanes boxer-briefs
    Gems for motorcyclists

  6. #5
    M-J Lifetime Achievement Award
    My Bike(s)
    1980 Yamaha XS850 - being dismantled; 1999 Kawaski Concours
    Location
    Washington County, WI
    Posts
    13,275
    You mean aftermarket, like these?

    DennisKirk.com - Metric Bikes - Brakes & Suspension

    Me, I weigh 240, the bike squats some, I live with it.
    Couldn't put "fail" across Lolo's picture, but she did come in 4th in the 100 m hurdles - still one heck of an effort.

  7. #6
    Newbie
    Posts
    12
    So-do these springs replace factory parts or are they add ons?

  8. #7
    Lost but forgotten

    My Bike(s)
    2012 Ninja 1000 ABS, 2002 Bandit 1200 S, 2002 Honda XR50R, 1992 Honda CR125R
    Location
    St. Cloud, MN, USA
    Posts
    20,861
    Replacements.
    'Busa shock, Racetech forks, Holeshot stage 1 & pipe, Hella headlights, CBRXX clipons, Givi E360 & V46, Zumo 550, Pilot Road 2CTs | Symtec grip heat
    Arai Signet GTR | Joe Rocket Meteor boots, Alter Ego pants, jacket
    | Gerbings liner | Alpinestars SP-1 gloves | Hanes boxer-briefs
    Gems for motorcyclists

  9. #8
    M-J Lifetime Achievement Award
    My Bike(s)
    1980 Yamaha XS850 - being dismantled; 1999 Kawaski Concours
    Location
    Washington County, WI
    Posts
    13,275
    You might want to have somebody whose done these kinds of things before do them. Not necessarily a bike shop, but somebody who rides and is good with threading the nut, under pressure, into the top of the fork.

    Me, myself, there are a couple of good mechs in the area, and I wouldn't bother with it.
    Couldn't put "fail" across Lolo's picture, but she did come in 4th in the 100 m hurdles - still one heck of an effort.


 

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