Bend your ear ? 1982 seca 650

Do these look too close to you I can see half of the middle hole in the top of the carb throat

 

I don't know whether it was right or not, but I bench synced my carbs by the holes. Got em close enough I could vacuum sync em

 

Which hole 1 2 or 3

 

The nearest hole to fully closed, so 1, but depending where you start. It's suprising how close to closed they sit when adjusted for correct idle.

 

So then they look correct in the photo

 

Can't make the individual carbs out, but from fully closed and to the edge of the first hole, set the "master". Then set them in turn out from there. Once running (and hot) set idle speed with the big knurled screw. Idle mixture screws 2.5 turns out.

 

you can use anything to set the "gap" i use a small drill bit. use idle knob to adjust #3 and the drag on the bit then use the adjuster screws to set the drag on the other 3 carbs.

then use idle knob to set butterfly of # 3 to expose the tiny hole on the top of carb throat. bike will start and then when warm adjust the idle to 1100 rpm
then do running sync

 

What size drill bit and there are 3 holes

 

#60 or a paperclip with no burr on the end and the second hole (bypass hole) first hole is the mixture screw hole

 

So why not just use the edge of the hole then? No sense in faffing with drills or paper clips. It does need a good pair of eyes though...

 

Well I have them all set at halfway through the bypass hole so we'll see if it works and putting them back on

 

Jeepers, so you used the middle of a hole as a datum? Why not the edge as I suggested, it's just more accurate? Ah well.

 

I miss understood there not on yet

 

setting the gap with some sort of shim first gives you same opening, setting to hole gives you close to proper idle.
you could just try to adjust to the holes what ever works for you.

 

So the bike is running good on three out of four cylinders but it won't fire on cylinder 1 it's got a new plug and a new wire but the Sparks are just a week and it's been on the charger

 

just to be sure, move that plug to another cylinder
a bad brand new plug isn't unheard of

 

It's not even sparking on a spark tester could it be a weak battery she's 2 years old

 

how's #3 spark look

 

Your not grasping the fundamentals of this system - it's what's called wasted spark, the spark for 1 and 4 happen together, 1 will be firing the cylinder, 4 will be pushing the exhaust gases out, and the spark does nothing (wasted spark - see).
So, if cylinder 4 has a spark, so will cylinder 1, unless the ht lead, or maybe, just maybe the ht coil is breaking down. Swap leads to 1 and 4 to see what happens. If 1 still misfires it's either the plug or valve issues.
Simple really.
Let us all know eh?

 

#4 fires #1 is ice cold could it be grounding out?

 

Ok, well did you swap the plugs 4 to 1 ? The reason for suggesting this is that the plug is fouled and this causes the spark to break the coil down at the ht output.

 

No I haven't had time yet this is a prior assessment

 

Brilliant explanation of wasted spark.
you seem to have a grasp on this, so i ask you. How do you test a spark tester?

 

A spark tester being exactly what?
I've seen, and have a plug fitted thing that lights up as the current flows through it, which work well, I've also seen a scissors type thing that you can open up and watch the spark jump (I'd be a bit nervous of using this, I don't have much tollerance to electric shocks).

 

this

 

Never seen one!

 

look in your factory service manual.

every one owns a spark tester, might be they just do not know it . comes mounted on your bike from the factory. #1 cylinder not firing swap plug wire #4 for plug wire #1 see if the problem follows the wire.
if not swap plug #1 with plug # 2, 3 or 4. does problem follow plug?
you can test coils by swapping primary connectors and spark plug wires to the other set of cylinders.
so when above tests are completed if #1 still not firing your problem lies elsewhere.

 

Common sense and logic -i like it.

 

It was the coil it had 3 times the resistance it should have so I put on a new coil now it's sparks but won't fire all the time