my bike wont start

[Guest]

86 Suzuki gs450 won't start. Good spark, rebuilt carbs, cranks over good, won't fire. I'll at a loss. Any ideas? Vaccuum needed on carbs? I don't know what the lines are, I forgot. There's a line from the top of the right carb. And then one on each carb on the sides inside, I belive those are for the floats??? Please help.oh, timing is good, valves are good. I think, from what I read they need to be .001-.003 intake and exhaust.any help would be great.

[tom203]

Is there fuel in bowls? That line on top of right carb is probably vacuum line to petcock- another line from petcock feeds the fuel to a tee between the carbs. Other lines could be fuel bowl vents
Is this a Calif bike- any emissions stuff?
Do you understand how "choke" system works- activate "choke' fully", use NO throttle and crank? if no sign of life after a little cranking, pull spark plug to look for some fuel

[pete]

Also may need to prime the carbs.

Either use prime on the fuel tap if there is one or if it's like mine there's a brass screw beside the tap. Undo that, wait 30 sec's, do it up again.

[86gs450]

Well my valves are wrong. I know that now. I think, I've read the clearances from 3 different sources and they all say different things. Anyone know what they are supposed to be? And also, to Pete, how do I prime the carbs? I've never owned a gs before. If you have pics that would help also. Thanks guys

[GateKeeper]

lots of good info here

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

get the manual and everything else you might need....

cheers

[pete]

The metric sizes for the valve clearances are 0.04mm to 0.08mm, not sure what that translates to in inches though...

As for prime, either your tap will have a position marked "PRI" or, if it's like mine there'll be a brass flat headed screw beside the top like this:



Undo that screw a turn or so, wait 30 seconds, then do it back up again.

All it does is let the fuel flow so you don't want to leave it undone.