Spark checking - correct procedure? - SV650.org

muzikill · 24-05-11, 12:02 PM

ok im going to recheck the spark plugs tonight, ive still got the old ones. What is the correct way to prepare for this and the correct way to check and prevent mishaps. Do i need to take both out, one at a time, plug the plug holdes in the cylinder head?

I appreciate the advice (trying to keep my head straight on this ignition fault diagnosis)

mikerj · 24-05-11, 12:20 PM

You don't need to plug the holes. Just remove the plugs, clip the HT leads on and rest the metal body of the plug against the engine to ensure it's grounded. Take both out to prevent the engine starting.

25-05-11, 06:53 AM

You don't need to take plugs out at all. Just pull caps of and stick old plug you have in there and rest on engine bolt or any ground as described above.

muzikill · 25-05-11, 09:07 AM

ta, i get a spark!

flymo · 25-05-11, 09:33 AM

Quote:

Originally Posted by mikerj

You don't need to plug the holes. Just remove the plugs, clip the HT leads on and rest the metal body of the plug against the engine to ensure it's grounded. Take both out to prevent the engine starting.

gotta be very careful with this approach....petrol vapour will ignite just as well outside the engine as in.

25-05-11, 09:38 AM

Always make sure that you have the spark plugs you are using to do the test, touching a metal surface all the time while testing. Some ignition circuits can be damaged if this is not done.

mikerj · 25-05-11, 10:50 AM

Quote:

Originally Posted by flymo

gotta be very careful with this approach....petrol vapour will ignite just as well outside the engine as in.

Extremely unlikely with a carb, with the plug out the vast majority of air is drawn in through the plug hole rather than the closed throttle. Even if a tiny bit of fuel were drawn in the mixture would be so weak the chances of it igniting are negligible.

On an injected system you should pull the EFI fuse (or unplug injectors) to prevent any fuel being injected.

flymo · 25-05-11, 11:08 AM

Quote:

Originally Posted by mikerj

Extremely unlikely with a carb, with the plug out the vast majority of air is drawn in through the plug hole rather than the closed throttle. Even if a tiny bit of fuel were drawn in the mixture would be so weak the chances of it igniting are negligible.

On an injected system you should pull the EFI fuse (or unplug injectors) to prevent any fuel being injected.

that was my point, turning off fuel supply would be wise.

24-05-11, 12:02 PM	#1
muzikill Member Mega Poster Join Date: Jul 2005 Location: Dunfermline Posts: 1,712	Spark checking - correct procedure? ok im going to recheck the spark plugs tonight, ive still got the old ones. What is the correct way to prepare for this and the correct way to check and prevent mishaps. Do i need to take both out, one at a time, plug the plug holdes in the cylinder head? I appreciate the advice (trying to keep my head straight on this ignition fault diagnosis) __________________ Learn to maintain your bike, take it apart, rebuild the engine & more (using better bolts ), drop it & fix it again! K3 Job c.v: Engine:remove/split/rebuild/refit. Replace:Gearbox,Fuel pump,Gaskets. Piston clean,rings. Overhaul:Throttle body,Injectors,Brakes,Forks. Remove/refit:Exhaust,Radiator,Oil cooler,Throttle,Air filter,Tank. Replace: Oil,Coolant,grease,brake hoses & bleed.

24-05-11, 12:20 PM	#2
mikerj Member Join Date: Jul 2010 Location: Devon Posts: 876	Re: Spark checking - correct procedure? You don't need to plug the holes. Just remove the plugs, clip the HT leads on and rest the metal body of the plug against the engine to ensure it's grounded. Take both out to prevent the engine starting.

25-05-11, 06:53 AM	#3
zadar Guest Posts: n/a	Re: Spark checking - correct procedure? You don't need to take plugs out at all. Just pull caps of and stick old plug you have in there and rest on engine bolt or any ground as described above.

25-05-11, 09:07 AM	#4
muzikill Member Mega Poster Join Date: Jul 2005 Location: Dunfermline Posts: 1,712	Re: Spark checking - correct procedure? ta, i get a spark! __________________ Learn to maintain your bike, take it apart, rebuild the engine & more (using better bolts ), drop it & fix it again! K3 Job c.v: Engine:remove/split/rebuild/refit. Replace:Gearbox,Fuel pump,Gaskets. Piston clean,rings. Overhaul:Throttle body,Injectors,Brakes,Forks. Remove/refit:Exhaust,Radiator,Oil cooler,Throttle,Air filter,Tank. Replace: Oil,Coolant,grease,brake hoses & bleed.

25-05-11, 09:38 AM	#6
warmshed Guest Posts: n/a	Re: Spark checking - correct procedure? Always make sure that you have the spark plugs you are using to do the test, touching a metal surface all the time while testing. Some ignition circuits can be damaged if this is not done.

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