Front fork boondoggle


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Scooters
Posts: 18
Joined: Mon Aug 28, 2017 9:02 pm
Location: Pottsville, PA
Motorcycle: 1993 GL1500 SE
2005 Honda Reflex
1982 Honda Elite

Front fork boondoggle

Post by Scooters »



93 1500 SE ...57k mi ...
3k are mine, a new to me bike .

I installed new progressive springs.
Better.

But something else is not right w that front suspension - harsh fork impacts when a pothole or rough road was encountered ...
So I drilled and tapped a port in the fork cap, and out comes ...

Only 4 ounces of oil.

Hmmm

Work interferes with my schedule ,
So I haven't had a chance to take her out,
But boy am I anxious.
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MikeB
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Re: Front fork boondoggle

Post by MikeB »

I do not understand what your issue is. The fork cap is on top right? Why did oil come out of the fork cap? There should be no oil that comes out of the fork cap. The oil level should be around seven inches below the fork top when the forks are extended.

Maybe you need to elaborate some.
MikeB
1998 - GL1500 w/184,500 miles ~ 2017 - GL1800 w/13000 miles
USAF Avionics Communications Tech - 1968 - 1986 / Flight Engineer C-130E - C-141B - 1986 - 1992. Retired
Industrial Maintenance Tech - 1992 - 2014
Retired in Tacoma, WA
Scooters
Posts: 18
Joined: Mon Aug 28, 2017 9:02 pm
Location: Pottsville, PA
Motorcycle: 1993 GL1500 SE
2005 Honda Reflex
1982 Honda Elite

Re: Front fork boondoggle

Post by Scooters »

I needed to drill the caps to provide air to drain the forks.
Oil drained from lower fork ports, as normal.

I recall measuring 5.5" from oil to top of fork when I installed new springs...

I can hear the oil squishing when I excercise the suspension.
Feels so better.
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aj1500
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Re: Front fork boondoggle

Post by aj1500 »

just have to ask to be sure, when you measured down when adding the new oil you did have the springs out and the forks collapsed,, correct
I think it takes right at 11 oz when changing to progressive springs, if I'm remembering it right from when I did mine
Scooters
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Joined: Mon Aug 28, 2017 9:02 pm
Location: Pottsville, PA
Motorcycle: 1993 GL1500 SE
2005 Honda Reflex
1982 Honda Elite

Re: Front fork boondoggle

Post by Scooters »

It's hard to recall ... but I believe I did have tubes collapsed. I can't recall of springs were in or out when measured 5.5" .
If springs were in, I can't see them displacing 8 oz. of fluid . Do you think it would?

I added 12.5 oz to each tube, and with tube extended, cap on, I used a metal rod to check oil level. It measured about 12.5" to top, which I read somewhere that is good.

The ride was harsh before, so I'm expecting a lot more comfort.

Slowly learnings way around these fantastic machines!
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aj1500
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96 Aspy 1500 W Lehmann trike

Re: Front fork boondoggle

Post by aj1500 »

I don't know what I was thinking, of course the springs were out when you measured, Duh you can't measure anything with them in :oops:
But if you don't have them collapsed you can put too much in. if you added 12.5 I think you went a little over but I don't know if it would be enough to cause problems. too much and the ride is hard too little and it's soft and will or can bottom out or even make a harsh rebound on big bumps that will feel like it's bottoming out but at the top of the forks. I added too much the last time a changed my fork oil and it was like riding an old wooden wheel wagon :shock:
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MikeB
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Re: Front fork boondoggle

Post by MikeB »

In case you need the fork spring installation instructions, here they are: https://www.progressivesuspension.com/p ... s/3055.pdf

I didn't look it up prior to my first reply. Had I done the research, I would not have said 7 inches.

An excerpt from the instructions says: "Fork oil level/volume should be checked according to the steps outlined in your authorized shop manual. Measurement of your fork oil by level is the preferred method. However, some manuals only specify a volume measurement. Due to the design of a progressive wound fork spring it will displace more oil thus requiring a maximum oil level of 5.5" (140mm).... " (Oil level is the distance from the top of the fork tube to the top of the oil with the fork completely collapsed and the fork spring removed ....)
MikeB
1998 - GL1500 w/184,500 miles ~ 2017 - GL1800 w/13000 miles
USAF Avionics Communications Tech - 1968 - 1986 / Flight Engineer C-130E - C-141B - 1986 - 1992. Retired
Industrial Maintenance Tech - 1992 - 2014
Retired in Tacoma, WA
Scooters
Posts: 18
Joined: Mon Aug 28, 2017 9:02 pm
Location: Pottsville, PA
Motorcycle: 1993 GL1500 SE
2005 Honda Reflex
1982 Honda Elite

Re: Front fork boondoggle

Post by Scooters »

Your description was right on aj1500;

Re: on fork oil volume, " too little and it's soft and will or can bottom out or even make a harsh rebound on big bumps that will feel like it's bottoming out but at the top of the forks."

That's what it felt like.

Well today I had a nice 100mile ride.
Wore a full face helmet for the first time.
The experience was fantastic, it felt like a different bike. Goodness factors were: better front suspension , full face helmet made things so much quiter, and my new leather pants were kickin.

Not sure where oil went. Thanks for posting info Mike B. I must have had springs in , protruding 2", when I measured. That's the only thing I can think of...
Other mistakes would have resulted in too much oil.

Anyhoo, time to plan other maintenance .

See ya on the road.
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