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Author Topic: FXR 39mm front fork service  (Read 3691 times)

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fxr4mikey

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FXR 39mm front fork service
« on: July 24, 2013, 09:17:41 AM »

I tried the search functions, but couldn't find what I'm looking for.

Anyone with input about servicing the front forks on their FXR.    I have a FXR4 (39mm forks) and they have NEVER been serviced since the bike came from the factory.  I bought the bike with 350 miles on it, now has 60,800 miles on it.   I think it's time to replace the oil, and maybe the seals too, even though I don't see any signs of leakage.

Any suggestion about what weight oil ?  Why ?

Suggestions about the 'easiest' way to do this ?

What else do I need to know ?


TIA for your input !
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2000 FXR4 Candy Tangerine
The Build -
•   SE Heads w/Cometic .030 gaskets
•   Bob Wood W6 cam
•   Mikuni HSR42 carb
•   Compu-Fire Single Fire Ignition
•   Rivera taper-lite chromolly adjustable push rods
•   Chrome lifter blocks w/HD B lifters
•   Pro-Force One AC and breather kit
•   Vance and Hines straight shots

Thermodyne

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Re: FXR 39mm front fork service
« Reply #1 on: July 24, 2013, 10:37:26 AM »

If you just want to service them, then you can change the fluid.  Drain it out completely, then pour in 9.2 oz of type E fork oil.

No need to replace the seals and bushings unless they are leaking.  Just change the oil right on the scooter.

That fork is basically just a damper rod POS.  And would benefit from having emulators or cartridges installed.  But short of that, you can help them a little, without spending a lot of money.  Replace the E fluid with some 15 weight and add a 1 inch spacer to the top of the spring when you put the cap back on.  It will firm and stiffen them a little.

You may know this, or perhaps not.  But when you take that cap off the top of the fork, the spring is going to try and launch it out of your hand.  And you'll have to force it back into place on the way back together.  Don't have your face in the way, and do protect the shinny parts of the scooter.  It can be done with a regular socket that fits the cap.  A fork cap socket makes it a little easier.  And a compression tool makes it an easy job.  And if you are thinking that you'll change the fork oil every 10K miles as the manual suggests, you can get caps that have fill holes in them, making it unnecessary to release the springs next time you change the oil.
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fxr4mikey

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Re: FXR 39mm front fork service
« Reply #2 on: July 24, 2013, 11:34:01 AM »

Thermodyne ... THANKS !!!!!


Z - got yur email, I'll call, I'd like to catch up with you anyway, THANKS!
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2000 FXR4 Candy Tangerine
The Build -
•   SE Heads w/Cometic .030 gaskets
•   Bob Wood W6 cam
•   Mikuni HSR42 carb
•   Compu-Fire Single Fire Ignition
•   Rivera taper-lite chromolly adjustable push rods
•   Chrome lifter blocks w/HD B lifters
•   Pro-Force One AC and breather kit
•   Vance and Hines straight shots
 

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