GS650 with Dyna S

[letus]

I bought a 1982 GS650 with Dyna S. It's not running, so I cleaned the carburetors, checked the compression. I don't see the Dyna S diagram for GS650, so I tried to use the diagram for GS550 and it doesn't work. I tried to swap the coil 1-4,2-3 and it has some sign of starting. Using the starting fluid with open throttle and it could start for about 1 or 2 seconds then die. They all have sparks but not that strong. Any suggestion? Should I use hotter spark plugs? Replace the coil?

[tom203]

Avoid that starting fluid,cuz it doesn't tell you much . Take off the signal generator cover- right side 4 inch diameter cover- and confirm you have a Dyna setup; also remove tank and check coils to see if they are stock.Lots of folks on here have the Dyna setup ,so tell them what you got and you'll get good advice. Is this a chain drive gs650? Follow the link to Basscliff's site (or wait till he stirs and finds you) to get you going. Troubleshooting is a step by step affair, avoid multiple "solutions" at same time.

[cowboyup3371]

What are your voltages at the battery and coils when cranking? When was the last time the carbs were properly disassembled, cleaned, put back together with new orings, and synched? Do you have the stock airbox back on? Running pods?

[letus]

Brand new battery fully charged by 2 amp charger. Carbs just cleaned 2 days ago. It currently has pods with shimps inside to block 40-50% of air. Cover is off, that's why I know it's Dyna. Coils are original. Shaft drive. Thanks for replies.

[Nessism]

Problem is most likely related to your monkey business about the carbs and pods. If you have spark the Dyna S is doing it's job. You might want to check voltage at the coils like cowboy/Scott suggested to make sure the spark is strong.

My signature has two links you might want to go though.

[letus]

Voltage is about 8-9v at coil. I've heard about coil mod, do you have any info?

[Nessism]

Voltage is about 8-9v at coil. I've heard about coil mod, do you have any info?

http://members.dslextreme.com/users/bikecliff/

[letus]

What is the left hand SW on that diagram?

[Suzuki_Don]

What is the left hand SW on that diagram?

Which diagram would you be referring to Sir?

[letus]

http://members.dslextreme.com/users/storagecliff1/images/DynaS_Coil_RelayMod.pdf

third page on the top right corner

[Nessism]

Left Hand (headlamp/turn signal) switch.

[Suzuki_Don]

Headlamp HI/LO beam + indicators.

[letus]

Which wire in the left hand switch connects to the coils?

[letus]

Could it be a clutch switch?

[tom203]

Could it be a clutch switch?

There is (or was) a clutch safety switch in left hand switch- but you said it was cranking, so this must be ok; there's nothing there connecting to coils. I would think that 9 volts to coils is too low, so start cleaning connections. Basscliff's site has good info- take advantage.