Kz750ltd-4 won't start

I've got a 82 75ltd-4 that won't start right now. Ran fine yesterday, had to bump start it at a gas station and now it will not start at all. Battery is currently on a trickle charge but checked out okay, and the bike would run for about 15 seconds with choke fully on. Any ideas?

Pics of plugs?
Steve

Currently no pics but plugs looked good and not fouled. Tops of Pistons looked pretty old though.

Roper wrote: I've got a 82 75ltd-4 that won't start right now. Ran fine yesterday, had to bump start it at a gas station and now it will not start at all. Battery is currently on a trickle charge but checked out okay, and the bike would run for about 15 seconds with choke fully on. Any ideas?

now it will not start at all -- even with choke?

would run for about 15 seconds with choke fully on -- when did this quit happening?

Good Fortune!

No it will not start at all now unfortunately. This all happened today just a few hours ago.

When finished charging, would have the battery load-tested.

A good fully charged battery might resolve the non-start issue.

If the battery is bad (such as won't hold a charge), may use jumpers to a good automotive battery, for testing purposes. CAUTION: NEVER JUMP TO A BATTERY IN A VEHICLE THAT'S RUNNING.

But if non-start persists even with ample battery power, would then try squirting some starter fluid into the carb air intake to determine whether the engine will momentarily start and run. As this will help indicate whether the non-start issue is more related to a fuel problem (such as supply and/or mixture) or more related to an ignition problem (such as spark quality and/or timing).

And be sure the kill switch is in RUN position.

Good Fortune!

Alright that's a good set of tips I'll try them tomorrow morning and check back in with results.

The last fellow that jumped his bike battery to a battery in a running vehicle had to install three bottles of replacement smoke.




Good Fortune!

Petcock?...lever out of position?...sediment restricting fuel flow to carbs? I had that happen before. Remove fuel line(s) at carbs inlet...insert fuel line(s) into clear empty water bottle...turn on petcock to confirm the fuel flow. Just a thought that can be easily overlooked. Got some bad gas?...that's a potential possibility too...seen it happen a couple times last year or 2 with local riders I've chatted with. And double-check engine run/stop switch on handlebar. Saw that happen recently on another thread. G-luck. ...............................Mike

Vroom-vroom!

And be sure there's no gooey black stuff oozing out of the ignition coils.

Good Fortune!

Does this bike have a fuel filter and fuel pump? It is a 650 chassis with a 750 swap.

No fuel pump. There should be a petcock screen inside the tank & there could be a fuel filter on the fuel line between the petcock & carbs.

How old is the battery & what is its voltage after charging? The bike needs a good, fully charged battery to run right.