COIL PACK SWAP

[Dean01982]

Another update. Changed the plugs  (all 4) still no joy, tested for a spark from the leads, screw driver in the cap and held bear the housing, clear spark from each but must admit it wasn't hugely strong. I did notice that pipe 1 and 3 weren't very hot where as 2 and 4 were to hot to touch. Pipe 1 was warm but not burning hot 

 

[onesea]

5 hours ago, Dean01982 said:

Another update. Changed the plugs  (all 4) still no joy, tested for a spark from the leads, screw driver in the cap and held bear the housing, clear spark from each but must admit it wasn't hugely strong. I did notice that pipe 1 and 3 weren't very hot where as 2 and 4 were to hot to touch. Pipe 1 was warm but not burning hot 

 

I spray water, on the down pipes much safer than risking hands.   If your feeling rich:
IR Thermometer
As I understand if 1 spark plug of a coil pack is sparking provided HT lead is in place and good connection etc they should both fire but someone with more knowledge will be along...

[Mississippi Bullfrog]

Hmmm...I posted something but it disappeared. It's probably working on the 'wasted spark' system where both plugs fire at the same time, one on the the compression stroke and the other on exhaust. It's simpler that way. So if you've got two cylinders not firing properly that's almost certainly an ignition issue.

[Dean01982]

33 minutes ago, Mississippi Bullfrog said:

Hmmm...I posted something but it disappeared. It's probably working on the 'wasted spark' system where both plugs fire at the same time, one on the the compression stroke and the other on exhaust. It's simpler that way. So if you've got two cylinders not firing properly that's almost certainly an ignition issue.

Hi thanks for your message. So would you think the issue lays from the spark plugs backwards? With the plugs been changed yesterday am I best re looking at the plug caps and coils?

Cheers

[Mississippi Bullfrog]

15 minutes ago, Dean01982 said:

Hi thanks for your message. So would you think the issue lays from the spark plugs backwards? With the plugs been changed yesterday am I best re looking at the plug caps and coils?

Cheers

I would suspect that is the case. A fuelling issue would usually affect all four cylinders. Now you know the plugs are good work backwards. If the two that are out share a coil that's the most likely cause. I think you said you had replacement coils and leads, in which case replace them with the new items.

[Dean01982]

Guys, to all those that commented thank you, I took the newly replaced coils off again today, and took the cap off, although they tested up ok with the multimeter they looked fairly worn, trimmed the ends and replaced, checked all over leads but still seemed to that dead spot, noticed pipe 3 was cooler than the rest, kept on tinkering, tapped each carb fairly hard then the engine started to idle better, revs seemed higher, put the tank back on and decided to give it a razz down the bypass. Definitely a huge improvement, I'd its sorted or not I ain't sure yet as I was still getting a delay on pick up, so all the things I tried were coil pack swap x 2, 4 x spark plug swap, liquid molly additive, checked all cables running to the coils, trimmed coil pack leads by 5mm and re fit and also tapped all carbs with a screw driver. I did notice when I got home that pipe 3 was definitely hotter than it was previous, but not as hot as the other 3, I have now put some new fuel in and hoping that it runs through and sorts the issue. Debating if it's worth running more liquid molly through to may dislodge more dirt?

 

Tha ks again.everyone

[Dean01982]

Also, I was thinking, if the float was stuck, would some compresses air up the fuel outlet on the carb not free it?or a small piece of wire?

[Ian Frog]

There are way too many sensitive seals and various rubber bits to even consider pushing a bit of wire anywhere in the fuel supply system.

Rule of thumb clean your way in and scrupulously clean your way out!

Cheers

Ian

[Bender]

Fresh petrol and a good long ride 

[Stu]

[Dean01982]

8 minutes ago, Stu said:

Which one lol

[Stu]

Just now, Dean01982 said:

Which one lol

 

Thats a very good point really! 

 

The most stupidest one err I mean @Bender

 

I suspect your problem was a stuck float in the carb if you ask me as you had a good strong spark didn't you? 

[Mississippi Bullfrog]

Are you saying that the replacement coils and leads aren’t new? Using parts of unknown condition just makes tracking problems down harder.

[Mississippi Bullfrog]

Just now, Stu said:

 

Thats a very good point really! 

 

The most stupidest one err I mean @Bender

 

I suspect your problem was a stuck float in the carb if you ask me as you had a good strong spark didn't you? 

My reading is that he’s getting weak sparks. But then I’m confused if he’s fitted new coils or old ones. Two cylinders out that share a coil sounds like an ignition problem. But it’s confusing what’s going on.

[TimR]

Take carbs apart and thoroughly clean 

Don't rely on carb cleaning products ..

They are for 'minor' problems .

 

Get the basics right before anything 

 

 

 

 

 

 

[Bender]

12 minutes ago, Stu said:

 

Thats a very good point really! 

 

The most stupidest one err I mean @Bender

 

I suspect your problem was a stuck float in the carb if you ask me as you had a good strong spark didn't you? 

Stupid is as stupid does