Just me and my GT500B
Moderators: oldjapanesebikes, H2RICK, Suzsmokeyallan
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- Around the block
- Posts: 72
- Joined: Sun Jan 04, 2009 9:34 pm
- Location: Halifax, Canada
Just me and my GT500B
It's a 1977 GT500B, I also have a 1976 GT500A that I'm making into a cafe racer.
It's working really well (finally) but a little weak on the right hand side, after I get that gremlin sorted it'll all be shiny.
Last edited by skids on Wed Apr 29, 2009 8:10 am, edited 1 time in total.
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- Around the block
- Posts: 72
- Joined: Sun Jan 04, 2009 9:34 pm
- Location: Halifax, Canada
This is how it was when I bought it, as you can see it was in pretty good shape, especially compaired to my other GT500 which I found leaning against a friends barn. The previous owner had dropped it and decided to sell. I still have to pop a dent in the tank, but I wanted to get a chance to just ride it for a while before I did anymore to it.
First thing I did was dump the sissy bar and the luggage rack, then replaced the stock bars with a slightly lower set. I also drilled lower holes in the seat mount tabs and shaved the top off to get rid of the humped apearance of the seat that came with it. I also gave the carbs a quick clean.
During my first long test run I blew a hole in the right piston. So I sourced a new one and rebuilt the top end. I totally rebuilt the carbs, replaced the petcock and the fuel lines, cleaned the tank, added gas line filters, replaced the rear brakes, fixed all the short in the wiring, replaced the blown rectifier and the half dead battery, scrubbed the chain, replaced the clutch cable, cleaned out the pipes... oh and did I mention cleaned the hunks of piston out of the crank case?
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- Yeah Man, the Interstate
- Posts: 686
- Joined: Mon Nov 24, 2008 12:22 pm
- Location: Alexandria, La.
- Contact:
GT500
Hi, I have a GT500A. It still looks a little rough as the day I bought it, but it runs better. I plan on getting it to look good later, good running is comes first. I rebuilt the carbs, replaced most of the ignition coils on the stator and built a new CDI unit. Any way, you mentioned that you removed the luggage rack, are you going to re-use it or would you be interested in selling it. Mine broke (have fixed it somewhat), and am looking for a replacement. This is unquestionably the best place for info/ help on the web for these old bikes and a great bunch of people too!
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- Around the block
- Posts: 72
- Joined: Sun Jan 04, 2009 9:34 pm
- Location: Halifax, Canada
I never thought about selling it, I'll give it a thought.
It is one of the best places to get good info about two stroke Suzuki's, if it wasn't for this place, Muzza and some of the other guys, I don't know what I would have done over the years. They've really made it possible for me to rebuild and repair my bikes.
It is one of the best places to get good info about two stroke Suzuki's, if it wasn't for this place, Muzza and some of the other guys, I don't know what I would have done over the years. They've really made it possible for me to rebuild and repair my bikes.
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- AMA Superbike
- Posts: 1769
- Joined: Tue Oct 14, 2008 6:47 pm
- Location: Blythewood, SC, USA
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- Around the block
- Posts: 72
- Joined: Sun Jan 04, 2009 9:34 pm
- Location: Halifax, Canada
I took the right carb off again, disassembled it and soaked the crap out of it with varsol, then cleaned and blew it with air. I found some more crud I missed, then put it back together and very carefully adjusted them according to http://www.gt500.org.uk/manual.htm
When I first got the bike I should have thoroughly cleaned the entire fuel system, tank, petcock and carbs before I rode it. All I did was a quick clean of the carburetors, which is what I believe lead to the holed piston. Another contributing factor might have been the Honda coils and worn out HT leads that were on it. I replaced them with the Suzuki coils off my GT500A.
Just plain, I was too eager to ride.
When I first got the bike I should have thoroughly cleaned the entire fuel system, tank, petcock and carbs before I rode it. All I did was a quick clean of the carburetors, which is what I believe lead to the holed piston. Another contributing factor might have been the Honda coils and worn out HT leads that were on it. I replaced them with the Suzuki coils off my GT500A.
Just plain, I was too eager to ride.
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- Yeah Man, the Interstate
- Posts: 686
- Joined: Mon Nov 24, 2008 12:22 pm
- Location: Alexandria, La.
- Contact:
coils
I had replaced the ignition coil with a Dyna model for a Harley. It had the same resistance ratings as an OEM, but a lot cheaper. Have been running on this setup for almost two years, no problems on ignition......(fingers crossed)
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- Yeah Man, the Interstate
- Posts: 686
- Joined: Mon Nov 24, 2008 12:22 pm
- Location: Alexandria, La.
- Contact:
coil
I am not sure which one now. It is green with two HT leads.It might be a DC7-1 or a DC1-1. I do know the resistance ratings were the same for an OEM coil for input and sparkplug side. I was able to build from scratch, a new CDI box with a design from board member Phil C in England. It cost $60.00 for parts, the coil was about $60.00 something, I think from Old Bike Barn.
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- Yeah Man, the Interstate
- Posts: 686
- Joined: Mon Nov 24, 2008 12:22 pm
- Location: Alexandria, La.
- Contact:
coil and CDI
OK, the coils is a DC6-1 (green 3ohm) You could make a mounting bracket to use the factory frame mounts, or just zip tie it in place. The gas tank seems to also 'capture' it in place, so I don't think it would wiggle out of place. Phil, myself, and a Dutch website (wiring diagram) reversed engineered the CDI box. Phil provided the electronics brains to figure out the values of the parts needed and I assembled a unit using the connecting wires from a dead OEM box. I posted pictures of the prototype board in use, the pictures for some reason are VERY large. I then rebuilt it in a small plastic box, filled it liquid vinyl (for coating tool handles) for vibration and waterproofing. It has been working like this for over a year,no problems. Just as a backup, I was able to get a used OEM from rngdng. If mine blows, I switch wires and am running again. I need to scan in the schematic of the circuit and make a few adjustments, then I will post it here for everyone. It is so simple, it could probably be adapted to other bikes....?
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- AMA Superbike
- Posts: 1769
- Joined: Tue Oct 14, 2008 6:47 pm
- Location: Blythewood, SC, USA
Yes, it could be adapted to almost any two-cylinder bike......like my RD350. I'll be happy to see the schematic....... You can also use Honda (and other) CDI dual-output coils which are dirt-cheap.
Lane
Lane
If you stroke it more than twice; you're playing with it.
Too many bikes, too much time, ENOUGH SPACE, FINALLY! Never enough money.........
Too many bikes, too much time, ENOUGH SPACE, FINALLY! Never enough money.........