Can anyone tell me why my Bike won’t start?

[Scaramoosh]

https://streamable.com/2thcb

It has sat in the Garage for about 7 years, I emptied the tank and put new fuel in, changed the spark plugs and charged the battery... which surprisingly works still. The throttle seems a bit jammed, like it won’t spring back, so I can manually move it, but it just stays in the place I’ve moved it to.

It’ll fire up like a second, then turn off as you can hear in the video.

Thanks.

[-]

Is it carb fed or fuel injected?

If carb, that would be my first suggestion. If it;s been sat for years, the fuel will have evaporated and left a load of crud in the jets and passageways.
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Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG.

[Scaramoosh]

It’s Carb, I was hoping I didn’t have to take it apart

[stinkwheel]

The needle valves will be stuck in their seats. I bet if you crack the drains on the carb float bowls, little to no fuel comes out.

It's just about started though. Does the fuel tap on those have a "prime" position? I'd be tempted to stick it on prime, crack the drain screws open one at a time and tap the side of the carb sharply with a bit of wood a few times until fuel runs out (tapping often frees off stuck needle valves). Then try starting it again.

Sounds like you need to lube or replace the one or both throttle cables anyway. That's a task that's probably easiest with the carbs off anyway. As I recall, the carb end is a total sod to get on and off with the carbs on teh bike.

Pattern throttle cables are cheap as chips on ebay. Almost to the point it's not worth pissing about with the old one if it's sticking.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Polarbear]

[Scaramoosh]

It has a off, on and reserve... it doesn’t seem like much fuel is coming out of the tank though. It says to set it to reserve and to take
the hoses off to drain, but only drips are coming out of the tap. I took the Carb lids off and it looks brand new inside...

GPZ500.

[martin734]

Something I have done in the past in situations like this is to put a couple of litres of petrol with 2 stroke oil in at a 50:1 before refilling as normal.
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Current bike: ST1100 "Big Red"

[Polarbear]

[Hong Kong Phooey]

Seven years of moisture stored in the tank, probably a fair bit of rusty crud blocking the tap gauze. I'd check the breather and vacuum hoses though before taking that tap off.
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'81 CG125, '97 FZS600 : '99 CBR600F4, '09 KTM RC8

[Scaramoosh]

It’ll only “start” with choke on, it does nothing any other way... but stopping right away. If I put any throttle on, it stops right away.

I’ll have to take it to a garage.

[martin734]

Sounds very much like your carb needs a through clean. It starts with the choke because there is just enough fuel going through the carb for the mixture to be rich enough to ignite. When you take the choke off or open the throttle more air is sucked into the cylinder but the blocked jets won't allow enough fuel through so the mixture is too lean to ignite.
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Current bike: ST1100 "Big Red"

[stinkwheel]

[Polarbear]

[stinkwheel]

[Polarbear]

[stinkwheel]

[Scaramoosh]

I had to sell it, I bought a new carb off a working bike and it still wouldn't start. I bought a new petrol tank tap and tried everything and it wouldn't start. Then I took it to a garage and they were like it needs new everything, suddenly the costs were mounting up and so I decided to get rid.

Not the bargain I thought when I bought it.