New Coils, no spark at 1 and 4. Narrowed down to CDI (maybe?)

[ukjules]

Hell you are close now !! What a result with the ignition !
- so zero petrol getting to the plugs , they are not soaked in petrol as they should have been with all that churning ?

Nothing to do with the tank lid ? Prob not as getting to the bowls. Or is it getting to the bowls ? Drain em if you can and make sure ?

Surely it must be the carb setup way out of kilt ? Jets blocked , floats or not even present in these new carbs ?

What about using some easy start spray ? Does it splutter and set the process in motion ?

Sure someone will come up with the answer here.
Hope the old carbs are at least half stripped down and parts ordered for them on your night shift sorting them ?

I am eagerly awaiting this to fire up !
What about a pic of this super bike ?

 

[tom203]

Double check that the spark plug wires are going to correct plug. If you got fuel and spark, it should at least cough.

 

[Tashields21]

Plugs are bone dry after cranking several times. Bowls do have fuel. Didn't have time to get into how much. It's likely the same fuel that was vacuumed in the day I installed the carbs which was 3-4 weeks ago. When I get back to it I will drain the bowls, remove the air filters, do a visual imspection and see what happens with some starter fluid.

99% sure the plug wires are correct. When installing the ignition I made sure pickup wires go to the correct coil, 1-4 on the left and 2-3 on the right. From the coils, outer plug wires go to 1 and 3 and inner plug wires go to 2 and 4.

This was the day I bought her.

 

[ukjules]

My coils to plugs are : (on gs550e 1980 standard)
lh - 1 / 4
rh - 2 / 3

i am 99.99999% sure.
do you have same ? dont think you do ?

carbs are vacuum carbs then ? they look similar to originals ?

 

[tom203]

”From the coils, outer plug wires go to 1 and 3 and inner plug wires go to 2 and 4.“

odd description….

the left ignition coil connects to 1 and 4…right connects to 2 and 3

 

[ukjules]

I think a worthy purchase would be..... a compression tester. Yes yes I am sure it is fine but it won't hurt to know ? when your cruising down the road en route to las Vegas you can have assurance and satisfaction....

Don't cost much ! not exactly in relation to this issue but on a bike that had so much tinkered with may cause satisfaction.
you clearly are slick at mechanics and you must have one !

- Hope dining room table cleared ready for original carb project and set back to bog standard just in case you can't get others to work.

looking forward to petrol on the plugs

 

[Tashields21]

"1-4 on the left and 2-3 on the right. From the coils, outer plug wires go to 1 and 3 and inner plug wires go to 2 and 4."

Yep, that's what I said, was just being more descriptive of where all 4 plug wires were going. I figured that was important info for the firing order of pistons? maybe not though.
​

 

[ukjules]

I am still not sure you have got it right in the way you phrase it !

​​​​​​I'll say it just to be sure !
The HT leads from the left coil go to plug 1 (left most) and 4.
The HT leads from the right coil go to plug 2 and 3.

iv just sussed what you mean. ....... I understand now !!!!!!
when you say inner wires you mean " the inside outlet HT lead of each coil"

​​​​That is correct ! my misunderstanding .

 

[salty_monk]

It's wasted spark system, both plugs spark every time the coil fires. As long as you have 1-4 and 2-3 on the correct coil it will be fine.

 

[Tashields21]

I figured now is good time to update you guys the bike while I let my heart rate come down.

My suspicion of air/fuel not making it to combution was correct. I took the pod filters off both carbs and shot a spray of starting fluid into each through the venturi. Hit the start button and it fired right up, the problem is the engine revved straight to the moon and stayed there. Enough to where I took a step back thinking the motor was going to blow up. Ran 5-10 seconds before I mustered up the courage to hit the kill switch under the seat.

I waited 5 minutes, put the filters back on, turned the chokes off and tried it again. Same thing happened but this time i was preppared so it only ran 2 seconds before I killed it.

Im not sure what to think about this one. I already have a tech call out to Murray's carbs to get his thoughts, just waiting for a call back. These carbs are tunes to the bike out of the box (supposedly) When I had the filters off I twisted the throttle to make sure both slides were operating together. They do operate together but the slides do not completely close the venturi (only about half way), but i think thats normal for these mikuni vm34s.

I still think its a carb issue, If so I can work that out with Murray. But is there any chance that the ignition timing could cause this? I followed the instructions provided by dynatek but being an amatuer and not understanding all this systems fully, I figured its worth asking.

Link attached to this post of the carb setup i am using.



Thanks guys.

Tyler

 

[Grimly]

It's a pair of VM34s, they should close all the way, nearly. Check your throttle cable positioning and tension.

 

[Tashields21]

Thanks Grimly, I looked at ither images of vm34s and noticed they are nearly closed just like you said. Next time i get a chance to fiddle with it ill see how I can adjust the cable. Thanks for the heads up.

 

[salty_monk]

Running seriously lean (which you would with no filters on) would make the idle race like that probably... it doesn't sound like the carbs are setup properly though.

 

[gs scott]

Very interesting thread - I'm wondering where he is today? Too many variables going on....