Sparking between HT lead and cylinder head - SV650.org

22-03-05, 09:27 PM

My bike is running rougher than a bears **** at the moment.

As the thread title suggests, there is a decent spark, but it is from the HT lead to the cylinder head. The lead is pressed home properly. The symptom are exacerbated in the wet. It does it the minute I start the bike if it has been standing in the rain. So I am guessing it is not water sprayed up by the front wheel.

Do I need to change the HT lead or could it be something like an incorrectly gapped plug? A good glug of WD40 on the lead helps by the way. Not a long term fix though.

I backfired all the way home tonight as there was unburnt fuel going into the pipe from the front cylinder.

22-03-05, 09:31 PM

new leads by the sounds of things

embee · 22-03-05, 09:52 PM

Generally speaking, once an HT lead will arc to ground it's had it.

The tracking, even when the plug is firing, tends to cause the insulation to degrade, and it won't "heal".

Just for interest, HT problems account for the majority of true breakdowns in petrol engined cars. That's one of the main reasons why modern engines have "on-plug-coils", it minimises the amount of HT carrying hardware.

It's a shame Suzuki didn't put on-plug-coils on the SV (hmmm, now there's a thought

).

23-03-05, 09:34 AM

Well just phoned a local Suzuki dealer to ask for a new lead, but they come moulded to the coil. Quoted £50 - £60. I don't think so. Apparently, the lead cap unscrews so I am going to try a new cap at £3, otherwise get an aftermarket lead and splice it to the coil.

23-03-05, 01:11 PM

Hmmmm, club together to get this?...

http://search.ebay.co.uk/sv-coil_W0Q...fltZ9QQfromZR8

includes what you need, I need indicators and the right rear footrest. Anyone else?

22-03-05, 09:27 PM	#1
Scoobs Guest Posts: n/a	Sparking between HT lead and cylinder head My bike is running rougher than a bears **** at the moment. As the thread title suggests, there is a decent spark, but it is from the HT lead to the cylinder head. The lead is pressed home properly. The symptom are exacerbated in the wet. It does it the minute I start the bike if it has been standing in the rain. So I am guessing it is not water sprayed up by the front wheel. Do I need to change the HT lead or could it be something like an incorrectly gapped plug? A good glug of WD40 on the lead helps by the way. Not a long term fix though. I backfired all the way home tonight as there was unburnt fuel going into the pipe from the front cylinder.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
K4 Front Cylinder Head	Sideshow#36	Stuff Wanted	2	13-08-07 08:12 PM
Front Cylinder Head	Sideshow#36	SV Talk, Tuning & Tweaking	3	12-08-07 11:10 AM
Cylinder head bolts	gc350	For Sale - SV's and SV related items	0	26-06-07 12:53 PM
How to Identify K3 Cylinder Head	I'm_a_Newbie	SV Talk, Tuning & Tweaking	2	03-05-07 12:24 AM
03 650S Cylinder Head	metallica155	SV Talk, Tuning & Tweaking	3	04-09-06 11:12 AM

22-03-05, 09:31 PM	#2
madmartyn Guest Posts: n/a	new leads by the sounds of things

22-03-05, 09:52 PM	#3
embee Member Mega Poster Join Date: Jul 2003 Location: Warwickshire Posts: 2,802	Generally speaking, once an HT lead will arc to ground it's had it. The tracking, even when the plug is firing, tends to cause the insulation to degrade, and it won't "heal". Just for interest, HT problems account for the majority of true breakdowns in petrol engined cars. That's one of the main reasons why modern engines have "on-plug-coils", it minimises the amount of HT carrying hardware. It's a shame Suzuki didn't put on-plug-coils on the SV (hmmm, now there's a thought ).

23-03-05, 09:34 AM	#4
Scoobs Guest Posts: n/a	Well just phoned a local Suzuki dealer to ask for a new lead, but they come moulded to the coil. Quoted £50 - £60. I don't think so. Apparently, the lead cap unscrews so I am going to try a new cap at £3, otherwise get an aftermarket lead and splice it to the coil.

23-03-05, 01:11 PM	#5
BaggaZee Guest Posts: n/a	Hmmmm, club together to get this?... http://search.ebay.co.uk/sv-coil_W0Q...fltZ9QQfromZR8 includes what you need, I need indicators and the right rear footrest. Anyone else?