Back firing into carbs

[BurnsYoFace34]

Also how do we check the advanced

[CYBORG]

I would use a timing light

[BurnsYoFace34]

So I have another dyna ignition system instead of the points. On the bike I have adjusted those or well timed it. But would that possibly have taken a shit an I not know it ? Should I try putting a new one in

[Fred Camper]

I would stick with the points, they are working if one cylinder will fire and you have that. No change in points will help IMHO.

[BurnsYoFace34]

I don't have points there's a dyna ignition on the bike already an I got a spare dyna ignition

[BurnsYoFace34]

Ok so I'm trying to check timing an I have the dyna ignition in have the red wire going to constant power with the ignition key in fuse box. So trying to check timing right ok have the motor in fire 1 light connected to yellow blue wire which is for cyc 1-2 start moving the dyna back an forth nothing try rotation all the way around 360 still nothing checknfor power to the dyne test like comes on but nothing for spark or fire wtf were or what am I missing

[Whiskerfish]

Working off that vid the idle is way too low. like half what it needs to be.

[BurnsYoFace34]

After re checking the belts an wires it's now backfiring back into carbs again but this time it's both sides now like it to far advanced or something

[gltriker]

Ok so over the winter I found out I had a bent intake valve on number 2 cyl. [/color]So an awesome guy cfairwheather shipped me some parts which I'm really appreciative of. An some new coils plugs an wires head gaskets since I had to replace the head I actually had a donor bike it was a 81 gl1100 but I was told the heads are the same just use the cam shaft from the original so after some cleaning up an maken sure the valves weren't stuck got the newish head on there. The only thing I did to the right side or cyl 1 an 3 was remove the old head gasket an put the new one on I don't recall removing the cam shaft from the head. But I did swap cams on the left side cyl 2 an 4 put new belts on the bike as well used the how to from octane for reference. Made sure crank was tdc 1. An the cams were on the marks on the cam cover. I'm at a loss idk what wrong any help or advice would be great thanks

Both cylinder heads weren't completely disassembled? Valve heads and their matching valve seats weren't cleaned and inspected for wear and probability of being slightly contact damaged (bent), as well. ???

Compression test all 4 cylinders, Again. Focus
Make sure the throttle grip is twisted and held wide open when compression testing. The choke button is fully pushed into its off position, too. Fully charged battery. Don't bother counting a recommended number of rotations.

Crank the engine until the compression testing gauge pointer needle won't climb any higher on the numbered gauge face.
Will take no more than 12ish seconds, maximum.

You keep questioning advanced ignition timing. No.
Get a compression testing gauge busy.
Yes. The cylinder compression testing instructions are still the same as I had given you, Sun Oct 16, 2022 6:28 pm.

Cylinder pressure leakdown testing is another diagnostic troubleshooting procedure you should learn and utilize, too.

[CYBORG]

compression test can answer a lot of questions. PAY ATTENTION. We need numbers, if you want help

[BurnsYoFace34]

Copy I will get those tests asap. I did a compression test last yr an the numbers were like 75 psi each but that was before I had actually rode it an bent the valve never did one after that but I will here soon

[gltriker]

Copy I will get those tests asap. I did a compression test last yr an the numbers were like 75 psi each but that was before I had actually rode it an bent the valve never did one after that but I will here soon

good ... click on this link to my engine's testing information:
viewtopic.php?f=30&t=39996&start=360

study Post #367 . "Trike's engine, cylinder compression testing video and photos"

AND
viewtopic.php?f=1&t=76923 <<<<...must read, too "Real world cylinder compression?"

Cylinder pressure leakdown testing is another diagnostic troubleshooting procedure you should learn and utilize, too.

study Post #364 . Trike's engine, cylinder leak down rate test results

[BurnsYoFace34]

Yall want the good news or bad news. Well good news is ibdid a compression test today. Bad news 3 outa 4 cylinders held 0 compression. An number 4 cyclinder had just over 75 psi

[gltriker]

Yall want the good news or bad news. Well good news is ibdid a compression test today. Bad news 3 outa 4 cylinders held 0 compression. An number 4 cyclinder had just over 75 psi

That's too bad news. Pull both cylinder heads and start posting photos of what you find, from this point on . Deal?

Burns- Hold on. Let us know what YOUR plan is.

I'm curious about your valve lash clearance adjustments and observations.
Last summer? when you initially checked/set the valves' lash clearance at 0.004inch, Did you find more than one or two valves had required more than a few thousandths change in clearance adjustments? Same question when you readjusted the valves to 0.006inch.
Yes?
A *bent* off-center valve head will translate as having mysteriously increased valve lash clearance when its 'face' is no longer making full concentric contact with the valve seat.

[BurnsYoFace34]

When I checked valve lash I set them all to the .006 then I rotated the engine several times an rechecked clearance several were loose again So I tightened them an re rotated the engine again an checked valves till there was just the the .006 clearance