Refuses to run on rear cylinder help - SV650.org

05-12-15, 05:35 PM

Hello I have a early sv that will not run on the rear cylinder .i have done a compression check and its the same as the front.i removed the head and all valves seem to be ok.i have also changed the carbs but it still oils up the plug and wont start unless I warm the plug.help

Red Herring · 06-12-15, 09:04 PM

Is it starting on both cylinders when you warm the plug or just the one? i.e.: does it run on the rear cylinder at all?

Biker Biggles · 07-12-15, 04:05 PM

Is there a spark at the rear plug?Are you sure it is oiling up or could it be fouling with unburnt fuel?If its oil it must be coming down the valve guides or via worn piston rings/bores.Fuel fouling could be flooding carb or no spark.I assume you already checked all this before taking the lid off.

Red ones · 07-12-15, 04:08 PM

Have you checked the coils?

07-12-15, 08:15 PM

+1 If plug is OK, I would also suspect coil or a leak between coil and plugs.

05-12-15, 05:35 PM	#1
COTTY Guest Posts: n/a	Refuses to run on rear cylinder help Hello I have a early sv that will not run on the rear cylinder .i have done a compression check and its the same as the front.i removed the head and all valves seem to be ok.i have also changed the carbs but it still oils up the plug and wont start unless I warm the plug.help

06-12-15, 09:04 PM	#2
Red Herring Member Mega Poster Join Date: Dec 2007 Posts: 2,708	Re: Refuses to run on rear cylinder help Is it starting on both cylinders when you warm the plug or just the one? i.e.: does it run on the rear cylinder at all?

07-12-15, 04:05 PM	#3
Biker Biggles Member Mega Poster Join Date: Jan 2005 Location: Barnet Herts Posts: 5,071	Re: Refuses to run on rear cylinder help Is there a spark at the rear plug?Are you sure it is oiling up or could it be fouling with unburnt fuel?If its oil it must be coming down the valve guides or via worn piston rings/bores.Fuel fouling could be flooding carb or no spark.I assume you already checked all this before taking the lid off. __________________ On a clear day we stand there and look further than the ordinary eye can see.

07-12-15, 04:08 PM	#4
Red ones Member Mega Poster Join Date: Jul 2003 Location: Hertfordshire Posts: 1,422	Re: Refuses to run on rear cylinder help Have you checked the coils?

07-12-15, 08:15 PM	#5
Tigerjohn Guest Posts: n/a	Re: Refuses to run on rear cylinder help +1 If plug is OK, I would also suspect coil or a leak between coil and plugs.

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