1990 Aspencade fork oil capacity


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702scottc
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1990 Aspencade fork oil capacity

Post by 702scottc »



Can anyone tell me what the fork oil capacity on a 1990 Aspencade is? My manual hasn't arrived yet and I need to change the fork oil. Preferably in ounces per fork.

Thanks



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WingAdmin
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Re: 1990 Aspencade fork oil capacity

Post by WingAdmin »

702scottc wrote:Can anyone tell me what the fork oil capacity on a 1990 Aspencade is? My manual hasn't arrived yet and I need to change the fork oil. Preferably in ounces per fork.

Thanks
I haven't got a 1990 manual, I do have a 1989 manual, and it shows it at 10.9 oz (US) left, 10.8 oz (US) right.

The 1994 manual shows 12.6 oz (Aspencade) / 12.2 oz (Interstate) left, and 12.7 oz right. Not sure what year this changed.

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702scottc
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Re: 1990 Aspencade fork oil capacity

Post by 702scottc »

Thanks for your help. I went ahead and downloaded a manual to my iPad for $10, should have done that from the start. Calls for 10.8 & 10.9 oz like you said. Says to use ATF, I'll just get some fork oil. What weight would you suggest? ATF is typically 5wt, I always used 15 or 20 wt belray in my 1100. Is the spring tension on the fork cap about the same as an 1100? My 1100 has an air cap and a jumper hose, this 1500 doesn't. Rides nice so I guess air isn't really needed.. Was going to drain the forks this afternoon but it hit 112 degrees today in the shade on my patio, a good job at 5am!

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Re: 1990 Aspencade fork oil capacity

Post by WingAdmin »

702scottc wrote:Thanks for your help. I went ahead and downloaded a manual to my iPad for $10, should have done that from the start. Calls for 10.8 & 10.9 oz like you said. Says to use ATF, I'll just get some fork oil. What weight would you suggest? ATF is typically 5wt, I always used 15 or 20 wt belray in my 1100. Is the spring tension on the fork cap about the same as an 1100? My 1100 has an air cap and a jumper hose, this 1500 doesn't. Rides nice so I guess air isn't really needed.. Was going to drain the forks this afternoon but it hit 112 degrees today in the shade on my patio, a good job at 5am!
The 1500 spring tension on the fork cap is tremendous - attempting to remove it without a tool can result in it tearing out the last one or two threads, launching the cap across the room, and personal injury. I wouldn't recommend it.

I use 15 weight Bel-Ray in my GL1500 forks. With Progressive springs, I run them with zero air pressure. Have a read through How to rebuild your front forks

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702scottc
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Re: 1990 Aspencade fork oil capacity

Post by 702scottc »

Thanks for the info. Can't believe they would make changing fork oil on this bike so problematic. Once I get the caps off the first thing I'm going to do is drill and tap the fork cap for an 1/8" pipe plug. That will fix this issue. Does the tool you mention work with the forks on the bike or do they need to be removed? I know my 1100 had some serious tension on the caps but it was nothing I couldn't push down to start the threads, this one can't be too much different. Tool would be nice.

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Re: 1990 Aspencade fork oil capacity

Post by WingAdmin »

702scottc wrote:Thanks for the info. Can't believe they would make changing fork oil on this bike so problematic. Once I get the caps off the first thing I'm going to do is drill and tap the fork cap for an 1/8" pipe plug. That will fix this issue. Does the tool you mention work with the forks on the bike or do they need to be removed? I know my 1100 had some serious tension on the caps but it was nothing I couldn't push down to start the threads, this one can't be too much different. Tool would be nice.
Most people either drill and tap for a schraeder valve, or buy replacement caps from an SE that have the schraeder valves already in place. That lets you easily change air pressure, and the valves can be easily unscrewed to allow the fluid to be drained and replaced.

The tool can be used on the bike, but the triple tree has to be loosened first, to allow the fork tubes to slide up enough (a couple of inches) to allow the base of the tool to grip the top of the fork.

Aerobeck98
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Re: 1990 Aspencade fork oil capacity

Post by Aerobeck98 »

No need to remove the fork caps. Remove the dive dampeners from the bottoms and add oil there turn upside and compress manually a few times to force the oil up top. Reinstall the dive dampeners and install the forks.

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Re: 1990 Aspencade fork oil capacity

Post by 89 1500 »

My factory manual for my 89 said use ATF too. Used fork oil and a few days later I had leaks. Drained and cleaned again added ATF and leaks disappeared. Been two years.

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Re: 1990 Aspencade fork oil capacity

Post by Snowmoer »

I would use ATF. I tried the same weight fork oil in my 88 (it called for ATF) and the front end bottomed out on bumps. Switched to ATF and no problems at all. In my old NX, 650, it also called for ATF. The opposite happened there. The front forks were like rocks. Switched to ATF, back to normal.



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