Author Topic: cb350 four cylinders 1(most left) and 4(most right) not firing (Read 10281 times)

Dos · « **Reply #50 on:** October 13, 2014, 07:54:51 AM »

Haha I'm sorry.I changed the front bulb and blinker/ horn switch last night so I'm not that dependent

but I've looked up all these videos to test the coils and I think mine are just a different brand? I'll try again but I think it's one prong on one of the pins and the other in the spark plug and its set at 20k

Dos · « **Reply #51 on:** October 13, 2014, 09:08:35 AM »

I'm reading guys haha

Dos · « **Reply #52 on:** October 13, 2014, 09:18:02 AM »

Okay so I think I have done the continuity test right.. The bike is switched on with engine switch on and I put the prongs in the end of the spark plug caps.. No continuity coming for the left coil which does cylinders 2 and 3 but it's odd because when the bike runs it only fires on 1 and 4..

TwoTired · « **Reply #53 on:** October 13, 2014, 10:30:04 AM »

I just looked in the FAQ regarding ignition. And all the donations I've made to it have been removed. I guess the moderators didn't like them anymore. $:-\$

So, I apologize for referring you there.

The fuse shown is the main fuse. If open, the bike won't get any power rather than just half of the points system.

You check the coil outputs (secondary) from each end of the spark plug wire. If the end caps are good you'll get continuity, 15kÎ© plus the resistance in each end cap. (5K x 2 or 10K x2.)
If your test meter is not auto ranging, you'll have the select the appropriate position on the function switch.

If an open is indicated, then unscrew the end caps and probe the wire's core conductor directly. S/B around 15KÎ©. If still getting an open reading then the coil is bad. Very rare without visible hatchet marks apparent on the coil body, But, anything mankind makes can fail.

Dos · « **Reply #54 on:** October 13, 2014, 10:51:11 AM »

The numbers move around d a bit but that's the left side coil doing cylinders 2 and 3

Dos · « **Reply #55 on:** October 13, 2014, 10:54:24 AM »

This is the right coil cylinders 1 and 4.. The numbers jump around for both

And the right point has a weak spark.
When I did the spark plug test 3 and 4 didn't fire but now since I'm getting results from both I'm going to retest.. Is there any possibly way this could be the rectifier?

Dos · « **Reply #56 on:** October 13, 2014, 11:08:26 AM »

Ok so the coil on the left side going to cylinders 2 and 3 has no spark. I'm calling it quits and buying a new coil unless you guys believe it could be something else.. i dont want to have to blow 161 on a coil for the cb350f.

Dos · « **Reply #57 on:** October 13, 2014, 12:57:57 PM »

How would one go about doing this? When I tested the continuity I had it on and the ignition switches to run

TwoTired · « **Reply #58 on:** October 13, 2014, 04:31:47 PM »

Resistance tests are done using ONLY the meter's injected power. Never with a power source injected from the bike's battery. Resistance tests are not passive, as voltage measurements are.

You failed to mention if the resistance tests on the coil secondary (ignition leads were done with or without the spark plug caps.

You seem to be in a hurry. Mistakes are often made when in a rush.

I don't think you can condemn the coils yet, as the measurements you've recently posted make no sense. But, it's your money.

Where were you when high school physical science classes were occurring? Is this now an elective?

Dos · « **Reply #59 on:** October 13, 2014, 04:57:59 PM »

okay i will test them soon and get back to you guys

Dos · « **Reply #60 on:** October 13, 2014, 08:13:56 PM »

I'm in a little bit of a rush. Its getting cold here and I want to be able to ride before I can't

Dos · « **Reply #61 on:** October 14, 2014, 03:06:41 PM »

I checked and both coils are receiving power ..red in black and white cable and black grounded. They each receive around 10.35 volts and that's because my battery is a little weak but at least they are both getting power. What next?

Quote from: TwoTired on October 13, 2014, 04:31:47 PM

Resistance tests are done using ONLY the meter's injected power. Never with a power source injected from the bike's battery. Resistance tests are not passive, as voltage measurements are.

You failed to mention if the resistance tests on the coil secondary (ignition leads were done with or without the spark plug caps.

You seem to be in a hurry. Mistakes are often made when in a rush.

I don't think you can condemn the coils yet, as the measurements you've recently posted make no sense. But, it's your money.

Where were you when high school physical science classes were occurring? Is this now an elective?

Dos · « **Reply #62 on:** October 14, 2014, 03:16:14 PM »

I'll repeat though. I am not getting sparks from the plugs which I think ultimately comes from the coil and I'm talking about the left coil which goes to cylinders 2 and 3 which when the bike was running was only being powered off 2 and 3 and 1 and 4 were not going

Dos · « **Reply #63 on:** October 14, 2014, 03:36:31 PM »

Roger that. And to do resistance you put the prongs in the end of both of the caps right?

Dos · « **Reply #64 on:** October 14, 2014, 03:41:32 PM »

The thing is both of the plugs weren't firing from the left and when I bought the bike it had new wires put in, but I'll take pics soon

Dos · « **Reply #65 on:** October 14, 2014, 03:55:40 PM »

Plug caps look good . I'm properly testing it

Dos · « **Reply #66 on:** October 14, 2014, 04:00:20 PM »

When I put the meter to 2k it reads nothing at 20k it will either climb up or go down.. I'm going to check the right coil now( the one that passes the spark plug test)

Dos · « **Reply #67 on:** October 14, 2014, 04:05:35 PM »

Same thing and the numbers are climbing

Dos · « **Reply #68 on:** October 14, 2014, 04:36:07 PM »

No the numbers go up and down but I'll go back and find the peak or neutral level

Dos · « **Reply #69 on:** October 14, 2014, 05:31:07 PM »

If the coil for cylinder 3 and 4 doesn't pass the spark test could it just be that coil then?

TwoTired · « **Reply #70 on:** October 14, 2014, 05:34:12 PM »

When you take the reading with the meter, insert the probes and take your hands off everything. Do the numbers still hunt when your hands are off?

You said the wires were replaced. The stock coils don't have replaceable wires. Please provide details about this.

TwoTired · « **Reply #71 on:** October 14, 2014, 05:35:01 PM »

Quote from: Dos on October 14, 2014, 05:31:07 PM

If the coil for cylinder 3 and 4 doesn't pass the spark test could it just be that coil then?

I think you're going to replace the coil regardless of what we say.

Dos · « **Reply #72 on:** October 14, 2014, 05:43:51 PM »

Nono I want to make sure of everything. They might have just been NGK tops I'm not to sure.. But if both of them aren't firing then I think it eliminates there being s problem with the wire

Dos · « **Reply #73 on:** October 14, 2014, 06:00:08 PM »

But what would be the cause of no spark on spark plus going to cylinders 2 and 3? Cdi box?

Dos · « **Reply #74 on:** October 14, 2014, 06:19:57 PM »

They are NGK tops I believe but I know for a fact these are original coils
http://m.ebay.com/itm/140890173614?nav=SEARCH

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Author Topic: cb350 four cylinders 1(most left) and 4(most right) not firing (Read 10281 times)