Hi all,
When I traded the 81 last year before the resto the guy had already ordered 82 front dual caliper rotors from ebay and threw it in the deal and even installed them for me. We couldn't test them but now that I am riding, changed brake lines and bled the lines I am still getting a spongy feel and not the braking power I expected from dual pistons and stainless lines.
Here is what it looks like, only 1/3 of the brake pads are in contact with the rotor
So I am guessing these are not compatible and I need either new rotors or go back and rebuild the single piston calipers?
Other options?
Attachments
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1975 Gl1000
1981 Gl1100, looking for a used good engine.
Somewhere on here is a brake swap list that might help. I have a 78 and used 85 V65 32mm twin piston calipers and 85 VT1100 twin brackets. You might need bigger rotors.
78 GL 1000, 70 CB750 sandcast, 70 CB836 hot rod, 1124cc 750 dragbike resto project.
You don't need a weatherman to know which way the wind blows.
You clearly have something going on there that isn’t right. I thought you were missing the small mounting brackets for the calipers, yet I see they are present. Looks like a rotor/fork lower/caliper incompatibility issue.
Current Bikes:
1966 CL77 - Honda 305cc - Dual purpose - "Gentleman's Scrambler" was a period moniker.
1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
1972 CB350F - Baby Four with low mileage - Cosmetic refresh to the next level 2021/2022.
1978 CB550K - Very original bike with only 7499 Km. from new - light cleanup and refresh done.
1983 CB1100F - Canadian model - DOHC Supersport in pristine low kilometre condition from new.
1984 GL1200 - Standard model in showroom condition - two owner bike from new.
1984 CX650E - Restored summer 2017 - a rare Eurosport model - excellent one owner bike.
The brakes on these bikes are not up to modern standards by any means, yet the dual piston ones do have a larger piston area vs single. If someone doesn’t have a solution to get that caliper on the rotor fully then the single piston with the new brake lines will be better than that setup.
Current Bikes:
1966 CL77 - Honda 305cc - Dual purpose - "Gentleman's Scrambler" was a period moniker.
1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
1972 CB350F - Baby Four with low mileage - Cosmetic refresh to the next level 2021/2022.
1978 CB550K - Very original bike with only 7499 Km. from new - light cleanup and refresh done.
1983 CB1100F - Canadian model - DOHC Supersport in pristine low kilometre condition from new.
1984 GL1200 - Standard model in showroom condition - two owner bike from new.
1984 CX650E - Restored summer 2017 - a rare Eurosport model - excellent one owner bike.
I can't say for sure, but I think the brackets used there are for the single piston calipers. The dual piston calipers' brackets are different. I might be able to come up with a pic...
"I have no special talent. I am only passionately curious." - Albert Einstein
"He that is good with a hammer tends to think everything is a nail" - Abraham Maslow
"If you can't take the time to do it right the first time, how are you ever going to find the time to do it over?" -Unknown
In The Shed:
'81 gl1100I barn find aka "Josie, the farmer's daughter." (almost comatose build)
'77 gl1000, roller parts bike.
'82 gl1100I, 'Old Crusty' titled roller parts bike (free!)
'82 gl1100I, My first 'Wing, and an expensive lesson! New2U Bike? Read Me.
In The Shed:
'81 gl1100I barn find aka "Josie, the farmer's daughter." (almost comatose build)
'77 gl1000, roller parts bike.
'82 gl1100I, 'Old Crusty' titled roller parts bike (free!)
'82 gl1100I, My first 'Wing, and an expensive lesson! New2U Bike? Read Me.
You're going to have to search Ebay or similar sites, I'm afraid. There was a thread not long ago concerning this swap where several year/ model parts options were discussed. You might start there...
"I have no special talent. I am only passionately curious." - Albert Einstein
"He that is good with a hammer tends to think everything is a nail" - Abraham Maslow
"If you can't take the time to do it right the first time, how are you ever going to find the time to do it over?" -Unknown
In The Shed:
'81 gl1100I barn find aka "Josie, the farmer's daughter." (almost comatose build)
'77 gl1000, roller parts bike.
'82 gl1100I, 'Old Crusty' titled roller parts bike (free!)
'82 gl1100I, My first 'Wing, and an expensive lesson! New2U Bike? Read Me.
Here is a cross reference with the correct part numbers that will take the dual piston calipers and mount to a 1982 GL1100 set up. They are taken from a 1982 GL1100 parts fiche and cross referenced to my Honda reference set up.
Now whether these brackets will mount to your 1981 GL1100 forks is a question and if someone has the brackets to check then a measurement should confirm the spacing etc.
GL1100.jpg (83.05 KiB) Viewed 258 times
Current Bikes:
1966 CL77 - Honda 305cc - Dual purpose - "Gentleman's Scrambler" was a period moniker.
1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
1972 CB350F - Baby Four with low mileage - Cosmetic refresh to the next level 2021/2022.
1978 CB550K - Very original bike with only 7499 Km. from new - light cleanup and refresh done.
1983 CB1100F - Canadian model - DOHC Supersport in pristine low kilometre condition from new.
1984 GL1200 - Standard model in showroom condition - two owner bike from new.
1984 CX650E - Restored summer 2017 - a rare Eurosport model - excellent one owner bike.
Thanks.
I just checked the box with the retired single piston calipers. The brackets are still attached to the calipers and actually are "C" shaped.
So he must have used the brackets that came with the dual piston calipers and obviously they don't fit.
Perhaps there are different diameter rotors used in the 82? My 81 has 280 mm diameter disks.
1975 Gl1000
1981 Gl1100, looking for a used good engine.
Yes the picture on the fiche I looked up for the 82 GL 1100 showed a vented rotor that is different than what you have on your bike. So either the rotor or the fork lower or both are different on the 82 model.
Current Bikes:
1966 CL77 - Honda 305cc - Dual purpose - "Gentleman's Scrambler" was a period moniker.
1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
1972 CB350F - Baby Four with low mileage - Cosmetic refresh to the next level 2021/2022.
1978 CB550K - Very original bike with only 7499 Km. from new - light cleanup and refresh done.
1983 CB1100F - Canadian model - DOHC Supersport in pristine low kilometre condition from new.
1984 GL1200 - Standard model in showroom condition - two owner bike from new.
1984 CX650E - Restored summer 2017 - a rare Eurosport model - excellent one owner bike.
The fork lowers have the same mounting spacing from '80 to '82, so the brackets will fit. The '82 rotors are indeed different, but IIRC, others have used the dual caliper with the early rotor. The '82-83 Aspencade used a wider, vented rotor.
If you'd like, I can dig up the '82 rotors and measure them some time today...
I still think the problem is the bracket, but can't really tell from the pic that's been posted.
"I have no special talent. I am only passionately curious." - Albert Einstein
"He that is good with a hammer tends to think everything is a nail" - Abraham Maslow
"If you can't take the time to do it right the first time, how are you ever going to find the time to do it over?" -Unknown
In The Shed:
'81 gl1100I barn find aka "Josie, the farmer's daughter." (almost comatose build)
'77 gl1000, roller parts bike.
'82 gl1100I, 'Old Crusty' titled roller parts bike (free!)
'82 gl1100I, My first 'Wing, and an expensive lesson! New2U Bike? Read Me.
Track T 2411 wrote: ↑Thu Nov 12, 2020 6:31 am
The fork lowers have the same mounting spacing from '80 to '82, so the brackets will fit. The '82 rotors are indeed different, but IIRC, others have used the dual caliper with the early rotor. The '82-83 Aspencade used a wider, vented rotor.
If you'd like, I can dig up the '82 rotors and measure them some time today...
I still think the problem is the bracket, but can't really tell from the pic that's been posted.
That would be awesome.
I will take a photo of the existing bracket.
1975 Gl1000
1981 Gl1100, looking for a used good engine.
