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Poldark

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    Virginia, USA

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  1. Yes, you need to replace that petcock. When in the "on" position, engine vacuum is required for fuel flow. "PRI" or "prime" does not require engine vacuum, constant fuel flow. California models did not have the prime position.
  2. Take a look at this 78-81 Suzuki GS1000 1100cc Bigbore Piston Kits with Head Gasket | CRUZINIMAGE.NET They are in Japan but ship to the US; very fast shipping. I have not yet used their pistons, but a local friend has built a few hopped up CB750 street engines with their pistons and has not had any issues.
  3. Here in the US, they went to fully electronic in 83. Earlier ones had mechanical advance. My 82 GS750E (16 valve) has mechanical advance.
  4. I don't think 5 degrees extra advance would make too much difference, but be sure to check for signs of ignition knocking. Factory ignition advance settings assume: a new factory spec engine, factory carburetor settings, and the fuel available at the time. Fuel burns faster under higher compression, if your engine is a little worn out, a little more ignition advance can help compensate for a small loss of compression. A slightly too rich fuel mixture will burn a little slower; a little extra advance can help compensate. I don't know what the fuel formulation is where you live, but that can have an impact too, especially considering the formulation has likely changed in the past 40 years. The 550 is a smaller, higher revving engine than the 750, so it would need more advance. I'd say go ahead and try it, just be looking for signs of premature ignition.
  5. Order of the three yellow wires should not matter. Yellow wires are carrying variable frequency AC, produced in the stator. Red and black wires DO matter, they carry DC current.
  6. Welcome to OSS. Take some time to read the forum rules. They may appear overly strict, but the rules keep the forum functioning smoothly. [see rule about motor oil] How is your bike ridden? Normal street use or drag racing; makes a difference on clutch selection. Take some time to introduce your ( is this yours OSS bike, or have been messing around with them for years). Don't be a one-post wonder. Lots of very knowledgeable enthusiasts around here.
  7. Normally 2-3 ohm for electronic ignition, 4-5 ohm for points. Older Dyna S ignition had an external module; newer ones don't because the electronics are small enough to all fit on the plate.
  8. When that sleeve heats up, it should expand and make contact with the cylinder block. Cast iron does have a lower thermal expansion ratio than aluminum, so.... Take one for the team; OSS research. ????
  9. I ride same model (82). 110/90-19 front and 130/90-18 rear. Those are one size wider than the recommended, but I've not had any adverse issues. I wouldn't go larger though.
  10. My guess would be an early GS1000 hub re-laced to a replacement rim.
  11. He did a great job; I bet it's crazy quick.
  12. California model. That explains it. When it comes to motor vehicles and firearms, California is like its own country within the US with special emissions/safety requirements. If you dear friends across the Atlantic get a "USA" model bike that seems strange, check your paperwork. We've had that situation here on OSS. ...and please stop taking our bikes.
  13. Glad to hear it's running well. Sounds like your fuel runs well with the stock jetting. Does your fuel contain corn-based ethanol?
  14. If it's just the speedometer and not the entire gage cluster, most early 80's GS models should swap out. I'm looking at a GS650GL frame. The frame is drilled just forward of the front tank mounts for an alternate mount location. A larger tank off some other GS model lines up nicely on that location. If you have access to a welder, you could cut the old forward tank mounts and weld in new ones, then fit a larger tank. Brighter light: the stock light bulb has an equivalent automotive size that is very common. Auto parts stores will have brighter options.
  15. Stock jetting is wrong. He said it is a US import bike. They came from the factory jetted too lean in order to meet US environmental regulations. The idle mixture screws were pre-set and capped off (easy to remove caps though). Our fuel content has changed a lot in the past 40 years. I don't know much about fuel in the UK, other than it's probably better but more expensive. If your bike is a US-California model, may God grant you patience to work on it.
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