79 gs550 only running on spray

[Guest]

Hey guys, be easy on me I'm new here and this is my first motorcycle. I'm mechanically inclined but this one has got me stumped.. Its a 1979 GS550 with VM carbs that I've taken apart and soaked for a day. Put them back together and the bike still won't run unless I spray gas in the intake side of the carbs. I set the bottom air/fuel screws at 3/4 of a turn and the side ones at 1 1/2 turns. Jets are 80 main and 50 idle. Fuel in all four carbs when I open the drain. Also when I was cranking on it a ground wire melted under the seat and I no longer have electric start!!

[tom203]

Do you understand use of "choke" system? Does it appear that you have healthy spark at plugs?

[TwoWheelKid]

Still won't fire with the choke on, and yes, lots of spark at the plugs.

Do you understand use of "choke" system? Does it appear that you have healthy spark at plugs?

[cornishgs]

Did you bench sync them? also is it fresh gas(petrol, stale wont fire up so well.

Hey guys, be easy on me I'm new here and this is my first motorcycle. I'm mechanically inclined but this one has got me stumped.. Its a 1979 GS550 with VM carbs that I've taken apart and soaked for a day. Put them back together and the bike still won't run unless I spray gas in the intake side of the carbs. I set the bottom air/fuel screws at 3/4 of a turn and the side ones at 1 1/2 turns. Jets are 80 main and 50 idle. Fuel in all four carbs when I open the drain. Also when I was cranking on it a ground wire melted under the seat and I no longer have electric start!!

[TwoWheelKid]

Yep bench synched and fuel is fresh

Did you bench sync them? also is it fresh gas(petrol, stale wont fire up so well.

[cornishgs]

If plugs are all dry and it wont fire carbs need checking again- float heights,internal passageways,choke plungers operating fully ,try opening fuel screws more,blocked idle circuit.

best double check stuff already done its the only way. pain in the ass but all jets need poking through with fine wire to really check .

[gustovh]

Is the fuel line attached correctly, the T between #2/3 carbs? Low compression will cause a no start issue as well.

V

[Big T]

TWK,

Check the holes that the fuel needles (underneath) go into.

Someone may have tightened the needles too much and snapped off the tips, clogging the pilot circuit

[cornishgs]

did you fix it?

[TwoWheelKid]

Yes, ended up being incorrectly set floats, was only running on cylinder #1 & #3. Set the floats to 22.4MM and all good now.

did you fix it?