info on GT750 expansion chambers
Moderators: oldjapanesebikes, H2RICK, diamondj, Suzsmokeyallan
- jabcb
- Moto GP
- Posts: 4311
- Joined: Mon Dec 13, 2010 4:32 pm
- Country: USA
- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
info on GT750 expansion chambers
Anyone know anything about the GT750 expansion chambers shown in the pic?
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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
- tz375
- Moto GP
- Posts: 6213
- Joined: Mon Nov 03, 2008 10:47 am
- Location: Illinois
Re: info on GT750 expansion chambers
Pretty sure that they are J&R, though the end of the muffler looks longer than any I have seen before, so it is possible that the baffles have been modified or replaced.
Do you have a picture of the baffles and where the chamber joins the header?
Do you have a picture of the baffles and where the chamber joins the header?
-
- Expert racer
- Posts: 1254
- Joined: Mon Dec 01, 2008 2:52 am
- Location: Manchester, UK
Re: info on GT750 expansion chambers
+1 to what Richard said, the mounting plate is typical J&R, as is the relatively slim diameter of the pipes. Looks sweet with the GS wheels 

1976 GT380 - wounded by me, and sold on
2006 SV650S - killed by a patch of diesel and a kerb in Feb 2019
2017 SV650 AL7 - naked and unashamed
2006 SV650S - killed by a patch of diesel and a kerb in Feb 2019
2017 SV650 AL7 - naked and unashamed
- jabcb
- Moto GP
- Posts: 4311
- Joined: Mon Dec 13, 2010 4:32 pm
- Country: USA
- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
Re: info on GT750 expansion chambers
Bike is in storage & have no baffle pic.
Header pic:
Header pic:
You do not have the required permissions to view the files attached to this post.
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
- tz375
- Moto GP
- Posts: 6213
- Joined: Mon Nov 03, 2008 10:47 am
- Location: Illinois
Re: info on GT750 expansion chambers
That looks like a J&R pipe. The header is shorter than usual though and that first bend at the clamp section is about 2 inches further forwards than normal and the pipe is closer to the motor.
When it comes out of storage, maybe you can measure the pipe and I can compare it to a set of J&R pipes in the shop here.
When it comes out of storage, maybe you can measure the pipe and I can compare it to a set of J&R pipes in the shop here.
- jabcb
- Moto GP
- Posts: 4311
- Joined: Mon Dec 13, 2010 4:32 pm
- Country: USA
- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
Re: info on GT750 expansion chambers
Two more pics. That's all I have till spring.
You do not have the required permissions to view the files attached to this post.
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
- tz375
- Moto GP
- Posts: 6213
- Joined: Mon Nov 03, 2008 10:47 am
- Location: Illinois
Re: info on GT750 expansion chambers
This mystery will have to wait until spring I guess. Do you happen to have removed the pipes or do you know if the headers have threaded collars ie stock headers?
- jabcb
- Moto GP
- Posts: 4311
- Joined: Mon Dec 13, 2010 4:32 pm
- Country: USA
- Suzuki 2-Strokes: 69 T350 thru 75 GT750
- Location: southwestern Pennsylvania
Re: info on GT750 expansion chambers
Answers will have to wait till spring -- I haven't seen the pipes removed.
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