switching 2 screw reservoir for 4 screw reservoir


Information and questions on GL1100 Goldwings (1980-1983)
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scowler
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Location: Cobble Hill, BC, Canada
Motorcycle: 1983 Honda GL1100 Interstate

switching 2 screw reservoir for 4 screw reservoir

Post by scowler » Fri Jul 27, 2018 12:36 am



can anybody tell me if the 4 screw front reservoir from '81 or '82 can be used to replace the 2 screw reservoir on my 83 interstate?



DaveO430
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Re: switching 2 screw reservoir for 4 screw reservoir

Post by DaveO430 » Fri Jul 27, 2018 5:29 am

No, it will not fit. ....

scowler
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Motorcycle: 1983 Honda GL1100 Interstate

Re: switching 2 screw reservoir for 4 screw reservoir

Post by scowler » Fri Jul 27, 2018 11:02 am

Thanks for the reply. I guess I didn't lay that out very well. I am wanting to know if the front master cylinder and 4 screw reservoir from a 1980 can be used to replace the 2 screw master cylinder system that is on the '83 interstate.

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redbug
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1986 Harley FLHT

Re: switching 2 screw reservoir for 4 screw reservoir

Post by redbug » Fri Jul 27, 2018 12:04 pm

According to the honda parts manual under gl1100 manuals on this site on page 169 of the parts manual, looks like 8 different front master cylinders on the std and int that fit. Part number 45500-463-671 which is on 80-81 std and int of the 8 that can be used will fit the 83. Check it out ,plus it show s all the part numbers for all the complete brake system. Interesting of the combination of the parts though, makes you scratch your head.
" Ridin on Tulsa Time "

scowler
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Location: Cobble Hill, BC, Canada
Motorcycle: 1983 Honda GL1100 Interstate

Re: switching 2 screw reservoir for 4 screw reservoir

Post by scowler » Fri Jul 27, 2018 12:45 pm

Thanks for that. I just ordered another 2 screw reservoir but if this one does;t last well I'm going to 4 screw master. 4 screws speed pressure on lid more evenly I hope. Thanks again for quick reply and great knowledge.

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redbug
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1986 Harley FLHT

Re: switching 2 screw reservoir for 4 screw reservoir

Post by redbug » Fri Jul 27, 2018 5:21 pm

That is just wonderful and all ready to be on the rode soon. You wouldn't happen to know the torque specs on those reservoir screws, maybe I can make mine last longer too?
" Ridin on Tulsa Time "

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jeffcosmo
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Motorcycle: 1983 GL1100 Aspencade
1983 GL1100 Aspencade
1983 GL1100 Aspencade (parts bike)

Re: switching 2 screw reservoir for 4 screw reservoir

Post by jeffcosmo » Fri Jul 27, 2018 11:50 pm

The one thing that matters on M/C braking systems is the bore size.

Nothing else, from a function standpoint. However, they have to match exactly.

So, no matter what bike it's from, if the bore sizes are the same, it'll work the same.

Further, all master cylinders that I've seen, have the bore size cast in somewhere on the body.

Cheers, Cosmo

P.S. This DOES mean that a Brembo master will work on a Honda system, as long as the bore size is the same. I can assure you from personal experience.

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DenverWinger
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Motorcycle: 1980 GL-1100 STD Vetter (2005-)
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Past rides
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Re: switching 2 screw reservoir for 4 screw reservoir

Post by DenverWinger » Sat Jul 28, 2018 7:21 am

After the front brake reservoir started to crumble on my 1100 I went to the local motorcycle junkyard looking for a replacement. They didn't have any 1100 M/C's, so I started looking at other bikes. Found a bike with dual front calipers where the hand brake fed both calipers like the '80 GL1100 (think it was a Yamaha) and bought the complete M/C assembly including brake lever from that.

It bolted right up to the 1100 handlebars, had to adapt the stoplight switch wiring a little, but it works perfectly.

My only mistake, I didn't note what year/make/model of bike it came from, if it ever fails I won't know what rebuild parts to buy... :oops: :cry: If it comes to that, maybe there's a part# on the M/C somewhere that I could "google"....
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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jeffcosmo
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Location: Burlington, WI (Honey Lake)
Motorcycle: 1983 GL1100 Aspencade
1983 GL1100 Aspencade
1983 GL1100 Aspencade (parts bike)

Re: switching 2 screw reservoir for 4 screw reservoir

Post by jeffcosmo » Sat Jul 28, 2018 11:58 pm

You may need only the diameter of the bore, which is cast in the M/C. Most master cylinders use very similar cups, so do not worry overmuch.

Cosmo



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