87' yamaha razz wont start.. sometimes starts then dies

[frenchiehxc]

she runs, sometimes for a couple seconds butt then dies, ive cleaned carb, and taken tank completely off, checked spark and compression.. any ideas?. it seems as if the only non-black line going to the caRB isnt running anything from it?? its the line on the bottom of the petcock..

[Wheelman-111]

Greetings:

More information, please. Is the spark plug "wet" or "Dry"? I'm not sure what you mean by: "it seems as if the only non-black line going to the caRB isnt running anything from it?? its the line on the bottom of the petcock..". From your description, it could be a lot of different things.

[frenchiehxc]

from the tank, a thick black line runs to what im assuming is the petcock. its about 6 inches away from the tank on the left side of the bike. then another hose (also thick and black) goes from that to the carburetor. underneat both of those is a small clear line that no fluid ever travels through..

[Wheelman-111]

Greetings:

I suspect the US Razz has a remotely-mounted petcock instead of being screwed into the tank, right?
If so, the clear line is for vacuum. Check that the other end of the line goes to the manifold or carb or any other vacuum source. If the line connection isn't sealing well, or if the line is chafed or cracked, there may be insufficient vacuum to keep the petcock open and flowing fuel.

If the spark plug is wet, check the carb float valve for leaky condition. This would cause the bowl to overfill and flood liquid fuel into the mixture, aborting combustion.

[pod4444]

the big line is ur fuel line one on top of the silver petcock. the bottom smaller line is ur vacuume line.hook the vacuume line to the carb vacuum port and take off the fuel line and crank the motor over .fuel should poor out of the fuel line.if this doesnt happen the petcock is clogged.