Still no fire! [emoji2959]

[TheRepoGuy]

I have most of my posts on a different forum so let me drop a bit of back history. This is a 1985 Interstate; literally was in pieces and has been rebuilt by me from the back to the front. No complaints as I’ve done it before with a different one! Almost every part has been replaced as well - have good voltage at every plug and everything ohms out where it should as far as I can tell.

She has the Neon coil mod and the coils are hot firing on the timing marks, those all lined up right oddly enough; Starter runs like a damn champ, the battery is holding steady at right around 13v , getting fuel and have air. Replaced the fuel pump just in case it was an issue but it’s running fine too and pushing fuel to the system, Pulse Generators are ohm’d and in spec, everything else has been replaced less that CDI box which is literally all I’ve got left which wasn’t replaced.

My only inclination left is the CDI box unless there’s something I’m missing here. Have fuel, spark and air; gaps on the plugs look good too so I don’t think the plugs are bad...I’m seriously stumped by this girl, she should have cranked over by now!

Anyone see something I’m missing?!
Nate


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[Ansimp]

So you now have spark? If so check for compression, then the only other requirement is fuel so I just use some starting fluid to make sure. Good luck. :good:

 

[TheRepoGuy]

So you now have spark? If so check for compression, then the only other requirement is fuel so I just use some starting fluid to make sure. Good luck. :good:

Aye - I have spark at all four, have to find some starting fluid and go that route I guess ha!

Since my service manual hasn’t shown its face yet, any idea what the compression should be?
Nate


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[Ansimp]

TheRepoGuy » Wed Jul 03, 2019 7:48 am[/url]":2a2y163i]

So you now have spark? If so check for compression, then the only other requirement is fuel so I just use some starting fluid to make sure. Good luck. :good:

Aye - I have spark at all four, have to find some starting fluid and go that route I guess ha!

Since my service manual hasn’t shown its face yet, any idea what the compression should be?
Nate


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If you really have a good gauge I can look it up but I am pretty sure it is around 140psi. That being said I have seen things run with 70 psi ( not well). Usually just pull all the plugs and jam my finger/thumb over the hole to be sure that we have compression. :whistling:

 

[joedrum]

You have spark ...good ...if it’s getting gas it should run ...yes what tony said use your finger

 

[TheRepoGuy]

I’ll find a gauge and go that route so I’m on point with numbers.

IN THEORY - I’m correct in assuming the CDI box does work because I’ve got spark though no?


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[dan filipi]

If you're seeing spark on all four plugs, then wiring and ignition components should be fine. The next question as far as spark goes, is spark occurring at the correct time. Spark at the #1 spark plug has to occur at F1. Some have had (including myself) the primary coil wires reversed. You get spark, just 180 wrong.

If you have compression but it won't start with ether, spark timing is suspect.

 

[TheRepoGuy]

If you're seeing spark on all four plugs, then wiring and ignition components should be fine. The next question as far as spark goes, is spark occurring at the correct time. Spark at #1 has to be at F1. Some have had (including myself) the primary coil wires reversed. You get spark, just 180 wrong.

She’s wired into the Neon coil so in theory unless I’ve got the wires going to the wrong plugs I should have it correct.

That’s how the CP sits on the bike, SO if that’s right then The top left plug goes to the number one on the right side, directly across goes to the number 3 then bottom left goes to number 2 and bottom right goes to 4.


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[joedrum]

You have a waisted spark system ..two plugs fire all the time ...those two wires will go to either front cylinders or back cylinders ....front is 1 and 2 and back is 3 and 4 ...

 

[TheRepoGuy]

You have a waisted spark system ..two plugs fire all the time ...those two wires will go to either front cylinders or back cylinders ....front is 1 and 2 and back is 3 and 4 ...

Yup - that’s the **** part ha! Guess I’ll switch some wires around but I’m straight on what goes to what as far as those connections are concerned


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[TheRepoGuy]

At least per this I’m wired correctly ha!


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[Steve83]

Try swapping the plug wires at the plugs front to rear. The fronts fire together, and the rears fire together, only 180 degrees apart.

 

[TheRepoGuy]

Try swapping the plug wires at the plugs front to rear. The fronts fire together, and the rears fire together, only 180 degrees apart.

Doing that later on today when I get back. I’m thinking I MAY have them backwards. After the finger compression check which seems solid on all four. Ordered a small spool of plug wire so I can make them a little longer and still adapt it to the bike; however by the diagram I’ve found of how the neon coils are set up on the car I THINK I’ve got it straight [emoji849]

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[Daeouse]

I’ve always been told that the formula is fuel, spark, air. If you know you are getting spark, are you sure you are getting air and fuel? If so, are you sure you are getting compression?

Stupid question, I know, but sometimes pointing out the obvious has helped in the past. LOL


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[TheRepoGuy]

It just dawned on me - if one and two spark at the same time I’m almost wondering if one and two in the coil are directly across from each other rather than one being the top left and two being the bottom left.

[emoji848][emoji848][emoji848]


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[joedrum]

I’m rather sure there across from each other ...I’m guessing but that be why there is wire outlet on either side of the coil ..this is probably the problem Nate

 

[Tom_Charlton]

Basic Info: 1 & 2 are fired by the same coil. #1 piston will be at almost top dead center when it fires and #2 piston will be at almost bottom dead center. One of the sparks does nothing because #2 has no fuel or compression at that point; that's why it is called a "wasted spark" system.

3 & 4 are fired by the other coil, with the same setup. #3 at TDC, 4 at BDC.

This piston arrangement results in a power stroke every 180 degrees.

Please forgive me for belaboring the point.

 

[dan filipi]

Could very well be you’ve got a blown head gasket, but stay the course by getting it to fire and run. Verify compression and spark timing first.

 

[joedrum]

PurpleGL1200I » Wed Jul 03, 2019 8:32 am[/url]":1l7i5n4u]
Basic Info: 1 & 2 are fired by the same coil. #1 piston will be at almost top dead center when it fires and #2 piston will be at almost bottom dead center. One of the sparks does nothing because #2 has no fuel or compression at that point; that's why it is called a "wasted spark" system.

3 & 4 are fired by the other coil, with the same setup. #3 at TDC, 4 at BDC.

This piston arrangement results in a power stroke every 180 degrees.

Please forgive me for belaboring the point.

Hmmm mark this is not quite right ...if number 1 piston is up ...so is number 2 ....same with 3 and 4 ....if 3 is up so is 4....

 

[TheRepoGuy]

Could very well be you’ve got a blown head gasket, but stay the course by getting it to fire and run. Verify compression and spark timing first.

I’ve got spark at all four plugs so I’m good there - timing marks on the pulleys were all lined up correctly before I attempted to crank it over including the T1 mark on the flywheel so that should be straight; getting fuel to the system which leads me to the compression issue. I have to go get a gauge at some point this morning but haven’t made it there yet, late night relocating vehicles which haven’t been paid for so I’m about half functional ha!


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