S2 won't start.
Posted: Fri Nov 03, 2017 7:59 pm
The S2 has been sitting for about a year, so before trying to start it I went through the following:
i) drained tank and both float chambers and put in 10L of fresh 98 octane.
ii) replaced front needle and seat (was leaking).
iii) cleaned plugs, altho' the BP6HS plugs look nice.
iv) charged the battery, which is a Motobatt AGM 32Ah: that took a regen cycle but it's now fully charged and turns over strongly
It then started and ran only on one cylinder. There was no spark in the front cylinder which turned out to be dead coil. So I fitted a pair of new coils (Fuelmiser CC505, as advised by the local Duke shop which has done some work on the bike; these seem to be a copy of the Bosch GT40T coils formerly on the bike). I'm fairly sure I didn't mix up the wires for the coils. it now has fat blue sparks front and rear, clean plugs, and fuel in both float bowls. It turns over strongly and occasionally fires, no backfiring, but doesn't look like starting and running. I'm reluctant to keep turning it over because I had to replace the starter motor clutch at some expense a couple of years ago. it's electric start only.
The guys at the local shop said it needs new carbs, but this shouldn't stop it from starting. It doesn't have chokes or ticklers, so I give the throttle a few twists before trying to start it.
Any suggestions would be much appreciated.
i) drained tank and both float chambers and put in 10L of fresh 98 octane.
ii) replaced front needle and seat (was leaking).
iii) cleaned plugs, altho' the BP6HS plugs look nice.
iv) charged the battery, which is a Motobatt AGM 32Ah: that took a regen cycle but it's now fully charged and turns over strongly
It then started and ran only on one cylinder. There was no spark in the front cylinder which turned out to be dead coil. So I fitted a pair of new coils (Fuelmiser CC505, as advised by the local Duke shop which has done some work on the bike; these seem to be a copy of the Bosch GT40T coils formerly on the bike). I'm fairly sure I didn't mix up the wires for the coils. it now has fat blue sparks front and rear, clean plugs, and fuel in both float bowls. It turns over strongly and occasionally fires, no backfiring, but doesn't look like starting and running. I'm reluctant to keep turning it over because I had to replace the starter motor clutch at some expense a couple of years ago. it's electric start only.
The guys at the local shop said it needs new carbs, but this shouldn't stop it from starting. It doesn't have chokes or ticklers, so I give the throttle a few twists before trying to start it.
Any suggestions would be much appreciated.
. Just need to clean them, preferably ultrasonically and paying special attention to the drilling that supplies air at tickover; and then rebuild - re-setting float heights, replacing seals etc.
. At least you know you're starting off right.
. It's not the oil that cases the insulation to come off. Laverdas use exactly the same pick-ups, but in an oil-less environment. And guess what? The insulation comes off the wires just the same ...
