Can't get over 100mph
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Can't get over 100mph
Greetings, hope you all are well.
Top speed on my '82 GL1100 Standard (cafe-racer) should be about 120 but I struggle at 100 (don't judge me). I ditched the tachometer sadly so I can't check the ratio. I heard a rumor, possibly started by me, that the '82 and '83 have a higher over all gearing, and run at a lower RPM, than the other GL1100 models - curious if this results in lost hp/speed. I'm giving it a tuneup, new plugs, and re-syncing carbs but I wanted to put this question to the group: any chance the carbs need a cleaning or is it possible to swap in different main jets? It runs great otherwise and I only use marine (non-ethanol) gas. Also, my compression may be a concern since I've taken off the original exhaust and put on shorty mufflers with decibel-killers (you're judging me. I can tell).
Good to be back with you all. Saw Roady passed, sorry to see. These bikes seem to mark the Age; one that seems to be slipping away.
Top speed on my '82 GL1100 Standard (cafe-racer) should be about 120 but I struggle at 100 (don't judge me). I ditched the tachometer sadly so I can't check the ratio. I heard a rumor, possibly started by me, that the '82 and '83 have a higher over all gearing, and run at a lower RPM, than the other GL1100 models - curious if this results in lost hp/speed. I'm giving it a tuneup, new plugs, and re-syncing carbs but I wanted to put this question to the group: any chance the carbs need a cleaning or is it possible to swap in different main jets? It runs great otherwise and I only use marine (non-ethanol) gas. Also, my compression may be a concern since I've taken off the original exhaust and put on shorty mufflers with decibel-killers (you're judging me. I can tell).
Good to be back with you all. Saw Roady passed, sorry to see. These bikes seem to mark the Age; one that seems to be slipping away.
1982 GL1100 Cafe - Born Naked
2020 October BOM
2020 October BOM
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Re: Can't get over 100mph
On a track day, a hundred years ago, my 81 GL 1100 clocked 126 mph through the traps … the manager of the track said it was a record … for a bike with a sleeping bag on the back …
Gord
Gord
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My Original 'RAT' was a hybrid '82 CB900/1100F
‘14 KLR650 ... not a rat ... yet
‘84 GL1200i ‘R2B6' (Rat to Be 6, the last, adopted by twowings)
My Original 'RAT' was a hybrid '82 CB900/1100F
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Re: Can't get over 100mph
cafe racer = much lighter than stock.
no tachometer = limited ability to tune
altering exhaust = altering tune.
reversion = loss of HP at rpm.
you are headed down the wrong road to performance.
only make one change ata time to prove tune.
good luck.
oh, it doesnt hurt to strap a sleeping bag on .
no tachometer = limited ability to tune
altering exhaust = altering tune.
reversion = loss of HP at rpm.
you are headed down the wrong road to performance.
only make one change ata time to prove tune.
good luck.
oh, it doesnt hurt to strap a sleeping bag on .
- Lucien Harpress
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Re: Can't get over 100mph
Yeah, there's some concern there. Both my 1000 and 1200 was able to (briefly) crack 100, the 1200 much easier so, but the 1000 was no slouch.
Exhaust differences shouldn't mean much on these bikes, but I've been wrong before. Exhaust also shouldn't do much for compression- maybe back pressure is what you're thinking of.
Weird tack- how accurate is the speedometer, I wonder? Just spit balling here.
Exhaust differences shouldn't mean much on these bikes, but I've been wrong before. Exhaust also shouldn't do much for compression- maybe back pressure is what you're thinking of.
Weird tack- how accurate is the speedometer, I wonder? Just spit balling here.
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1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
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1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
1980 KZ1300- Bike's Haunted
1976 GL1000 (Yellow)- It Runs (Poorly) and Doesn't Leak (Mostly)
1974 Velosolex 3800- Better Than Walking
1972 CB750- Broke the Chain And Ate the Motor
1969 CT90- The Most Fun You Can Have on 90ccs.
1965 CA77 Dream- Needs a Full Teardown, but Complete
All advice I give is only valid until an expert corrects me.
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Re: Can't get over 100mph
I mighta got 127 without the sleeping bag …
Gord
Gord
"I'd rather Ride than Shine"
‘14 KLR650 ... not a rat ... yet
‘84 GL1200i ‘R2B6' (Rat to Be 6, the last, adopted by twowings)
My Original 'RAT' was a hybrid '82 CB900/1100F
‘14 KLR650 ... not a rat ... yet
‘84 GL1200i ‘R2B6' (Rat to Be 6, the last, adopted by twowings)
My Original 'RAT' was a hybrid '82 CB900/1100F
- flyin900
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Re: Can't get over 100mph
Also if a jockey was duct taped to the shelter rather than a 7 ft guy piloting the bike… 130 was in reach
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1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
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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.
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.
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Re: Can't get over 100mph
Yea something is out of whack. Should easily pull to at least 115 and if running well closer to 125. what do the plugs say? and do a compression check. How is you daily fuel economy?
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Psst. oh and by the way CHANGE YOUR BELTS!!!!
"The book is wrong, this whole Conclusion is Fallacious" River Tam
2008 GL1800 IIIA "TH3DOG"
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
and a whole garage full of possibilities!!
Psst. oh and by the way CHANGE YOUR BELTS!!!!
- pidjones
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Re: Can't get over 100mph
Restricted intake or exhaust is what I would first suspect. Stock jetting (if clean) should provide plenty of fuel. Maybe just check the ignition advance. Also, make sure zero drag from brakes and such - that can rob more than you think.
Last edited by pidjones on Wed Feb 01, 2023 9:02 am, edited 1 time in total.
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Ex 2006 GL1800 - the Black Pearl SOLD! to make room for:
2021 Can-Am Spyder RT Limited Dark Chalk Metallic
1975 Red GL1000 project - ex Pistol Pete project
1972 Triumph T150V Trident rescue - finished and FOR SALE!
1976 Yamaha RD400c
1978 GL1000 with '75 engine - the Hunley
Ex 1978 GL1000
Ex 1979 GL1000
Ex '79 CB750F rat bike
Ex '86 SEi
Ex '77 GL1000
Ex '76 RD400
Ex '72 Penton 125 set up for flat track
Ex '73 RD250
Ex '68 TR6C - chopped
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Re: Can't get over 100mph
1982 1100 standard. (sold)
1986 Yamaha FJ1200
2000 Yamaha Roadstar
1976 GoldWing. running but not on the road
1978 Goldwing. future cafe project.
2019 Can-Am ryker (boss's new ride)
2002 Shadow American Classic(sold)
1983 Shadow 500. (sold)
1986 Yamaha FJ1200
2000 Yamaha Roadstar
1976 GoldWing. running but not on the road
1978 Goldwing. future cafe project.
2019 Can-Am ryker (boss's new ride)
2002 Shadow American Classic(sold)
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Re: Can't get over 100mph
Ask yourself: "how much restriction would a shorty muffler have compared to the stock one, in order to be at an acceptable sound level?"
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Re: Can't get over 100mph
Thank you all for taking the time to reply, all good points as I tear into this. And maybe its time to put the saddlebags back on...cheers lads.
1982 GL1100 Cafe - Born Naked
2020 October BOM
2020 October BOM
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Re: Can't get over 100mph
the most important thing you have learned is to add a sleeping bag. now, if you call it a cafe racer, you wanna roll the bag tight and safety wire it to the frame behnd your left calf. if its a mekkskin blanket, roll it tight and tie it vertically to you back. if its a ..................
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Re: Can't get over 100mph
did i get another red helmet?
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Re: Can't get over 100mph
I agree with checking ignition advance and would also check the timing belts to make sure it isn’t off a tooth, had a friend who replaced his head gaskets (GL 1100) and complained it didn’t have any top end afterwards. He rechecked the belt timing and was off a tooth on each cam gear. Re-indexed them and ran like it used to.
1975 GL1000
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Re: Can't get over 100mph
Thanks Digger, will do - didn't consider that.digger wrote: ↑Wed Feb 01, 2023 10:59 pm I agree with checking ignition advance and would also check the timing belts to make sure it isn’t off a tooth, had a friend who replaced his head gaskets (GL 1100) and complained it didn’t have any top end afterwards. He rechecked the belt timing and was off a tooth on each cam gear. Re-indexed them and ran like it used to.
1982 GL1100 Cafe - Born Naked
2020 October BOM
2020 October BOM