1972 GT550 cafe build - new topic
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- jabcb
- Moto GP
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Re: 1972 GT550 cafe build - new topic
Installing the Accent ignition. Very easy to install. There is a good blob of something to protect a few of the components from vibration.
The replacement cam has two magnets & the specs list the dwell angle as 120 degrees. The stock ignition has a dwell angle of around 180 degrees, so the Accent ignition should use less current the stock points.
cafe-GT550-1233 by jabcb, on Flickr
The replacement cam has two magnets & the specs list the dwell angle as 120 degrees. The stock ignition has a dwell angle of around 180 degrees, so the Accent ignition should use less current the stock points.
cafe-GT550-1233 by jabcb, on Flickr
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
- Alan H
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- Suzuki 2-Strokes: 4 x GT550s - J, M, A, B.
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Re: 1972 GT550 cafe build - new topic
If there's only 1 pickup and 2 magnets, it's for a twin, not a triple. It either needs three pickups with 3 12v coils and one 'target', or three targets (magnets or optical triggers), one pickup and three 4v coils connected in series.
2 magnets and 1 trigger will spark every 180 degrees, not every 120 degrees as you need for 3 cylinders.
I think you may be mistaking dwell angle for firing interval.
Unless of course, it's a completely new system that hasn't been discussed yet, in which case, please carry on and post more details.
The old system was for the 380 and 750 Suzies and kwak triples. Wasn't it to do with engine rotation?
2 magnets and 1 trigger will spark every 180 degrees, not every 120 degrees as you need for 3 cylinders.
I think you may be mistaking dwell angle for firing interval.
Unless of course, it's a completely new system that hasn't been discussed yet, in which case, please carry on and post more details.
The old system was for the 380 and 750 Suzies and kwak triples. Wasn't it to do with engine rotation?
Think of how stupid the average person is, then realise that half of them are more stupid than that.
- jabcb
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- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
Re: 1972 GT550 cafe build - new topic
The circuit board has 3 pickups 120 degrees apart & is labelled for the “GT 55?”. (The “?” is hidden behind the white sticker.) The replacement cam is labelled “Suzuki GT”.
The manual claims the dwell angle is 120 degrees.
I’m certainly no expert, but this is guess…
The cam has two closely-spaced holes. One is empty & the other has a magnet. 180 degrees away from that pair of holes are another two holes with one empty & one with a magnet.
If this is a north pole + south pole arrangement then the dwell angle of around 120 degrees is span from the magnet in one pair to the hole in the other pair.
The manual claims the dwell angle is 120 degrees.
I’m certainly no expert, but this is guess…
The cam has two closely-spaced holes. One is empty & the other has a magnet. 180 degrees away from that pair of holes are another two holes with one empty & one with a magnet.
If this is a north pole + south pole arrangement then the dwell angle of around 120 degrees is span from the magnet in one pair to the hole in the other pair.
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
- Alan H
- Moto GP
- Posts: 3172
- Joined: Thu Feb 16, 2012 11:50 am
- Country: England
- Suzuki 2-Strokes: 4 x GT550s - J, M, A, B.
- Location: The Republic of South Yorkshire
Re: 1972 GT550 cafe build - new topic
I see now. I think I'll stick to points though!!
Think of how stupid the average person is, then realise that half of them are more stupid than that.
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Re: 1972 GT550 cafe build - new topic
Great work looks sharp what did you do with the JR chamber's that are on the first picture.
- jabcb
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Re: 1972 GT550 cafe build - new topic
I had offered the pipes at a hard to beat price: shipping cost + $1. Got no serious interest other than the garbage man, who hauled them away some time ago.
Also offered the fugly fairing & got no interest. Had it stored in a friend’s garage. He moved & its now gone but I don’t know what he did with it. Might have ended up being used for target practice.
Also offered the fugly fairing & got no interest. Had it stored in a friend’s garage. He moved & its now gone but I don’t know what he did with it. Might have ended up being used for target practice.
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
-
- Around the block
- Posts: 53
- Joined: Mon May 16, 2011 8:33 am
Re: 1972 GT550 cafe build - new topic
Sorry I miss itjabcb wrote:I had offered the pipes at a hard to beat price: shipping cost + $1. Got no serious interest other than the garbage man, who hauled them away some time ago.
Also offered the fugly fairing & got no interest. Had it stored in a friend’s garage. He moved & its now gone but I don’t know what he did with it. Might have ended up being used for target practice.
- jabcb
- Moto GP
- Posts: 4241
- Joined: Mon Dec 13, 2010 4:32 pm
- Country: USA
- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
Re: 1972 GT550 cafe build - new topic
Project nearing completion.
From scratch wiring just about done. Using new rectifier & regulator from Oregon Motorcycle Parts, CustomLED LED flasher & GS-series starter relay. Using relay to connect regulator directly to the battery.
cafe-GT550-1352 by jabcb, on Flickr
From scratch wiring just about done. Using new rectifier & regulator from Oregon Motorcycle Parts, CustomLED LED flasher & GS-series starter relay. Using relay to connect regulator directly to the battery.
cafe-GT550-1352 by jabcb, on Flickr
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
- jabcb
- Moto GP
- Posts: 4241
- Joined: Mon Dec 13, 2010 4:32 pm
- Country: USA
- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
Re: 1972 GT550 cafe build - new topic
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
-
- Expert racer
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Re: 1972 GT550 cafe build - new topic
Wow, that's looking super sweet, jabcb
Cheers Geoff
Cheers Geoff
- Evans Ward
- To the on ramp
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- Suzuki 2-Strokes: 76 GT750, 72 H2 750, 84 RZ350
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Re: 1972 GT550 cafe build - new topic
What a beauty! Can’t wait to see the completed project!
1976 Suzuki GT750 (Maui Blue), 1972 Kawasaki H2 750 Mach IV (Candytone Blue), 1984 Yamaha RZ350 (KRR- Yellow/ Black).
- joolstacho
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Re: 1972 GT550 cafe build - new topic
Super-tidy mate, well done.
- jabcb
- Moto GP
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- Joined: Mon Dec 13, 2010 4:32 pm
- Country: USA
- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
Re: 1972 GT550 cafe build - new topic
Using angled tapered K&N filters. Outer filters need to be rotated to clear early side covers. But then the right filter contacts the oil pump cover — problem easily solved by removing part of the cover.
cafe-GT550-1449 by jabcb, on Flickr
Am now done except for the mirrors and Higgspeed exhaust.
cafe-GT550-1450 by jabcb, on Flickr
cafe-GT550-1449 by jabcb, on Flickr
Am now done except for the mirrors and Higgspeed exhaust.
cafe-GT550-1450 by jabcb, on Flickr
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
- jabcb
- Moto GP
- Posts: 4241
- Joined: Mon Dec 13, 2010 4:32 pm
- Country: USA
- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
Re: 1972 GT550 cafe build - new topic
Higgspeed exhaust is here.
Turns out that there is a small difference between early & late frames. Not as big as was with the GT380 build. Practice makes perfect.
Looks like designing a side stand that doesn’t mess with cornering clearance is going to be more of a challenge that on the GT380.
Trial adapter for the left exhaust:
cafe-GT550-1506 by jabcb, on Flickr
Turns out that there is a small difference between early & late frames. Not as big as was with the GT380 build. Practice makes perfect.
Looks like designing a side stand that doesn’t mess with cornering clearance is going to be more of a challenge that on the GT380.
Trial adapter for the left exhaust:
cafe-GT550-1506 by jabcb, on Flickr
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
- Alan H
- Moto GP
- Posts: 3172
- Joined: Thu Feb 16, 2012 11:50 am
- Country: England
- Suzuki 2-Strokes: 4 x GT550s - J, M, A, B.
- Location: The Republic of South Yorkshire
Re: 1972 GT550 cafe build - new topic
Very nice. I do love the Gold GT550 J.
Think of how stupid the average person is, then realise that half of them are more stupid than that.