dual spark plugs (and issues)

Just put these in last night, along with a long list of other things. I did NOT gap them, and have no clue what gap to use, being dual. Anyone ever use them?

The engine turns over now and idles, but, she won't drive away (dies when I let clutch out) and sounds a bit odd. Also put in stock mains, new filter, new clutch cable with oil in the plungers (which were rusty by the way). To beat all, the tacho died. I am hoping I just have a bad front connection, and will make sure I have the front spark plug lead on tight later tonight. Any experience or suggestions appreciated. Had to drive the van to work today and a few days of that will kill me. Traffic sucks.

[jambo]

Which duel spark plugs did you use? They should be fine, I'd be looking for tight connections everywhere first of all. When you say stock mains, are you refering to the carb jets? what was in there before, and why have you changed them?

Check all battery and loom connections are tight....

I did have a filthy desnorkled airbox, with 152.5 mains, 17.5 pilots and 2 shims under the needle. Flow through exhaust. Ran pretty good, but, the bike is old and not worth the cost to perfect on dyno etc. In the really cold and winter, started having lots of icing issues and related probs, though it always ran, and had some water issues after a bucketing rain.

Just wanted to go back to stock where I'd know what I was gonna get.

NGK dual sparkers, don't know exact spec, but, the shop I got them from is spot on. How did you gap your's Jambo? Usually I just throw them in the way they come out of the box. Cheers -D

bumpage

[yorkie_chris]

Dead tacho usually = you've knocked the LT lead off the front plug putting the airbox back on.

Listen to Jambo. If your tacho is doing weird things it could be a bad electrical connection. I had that trouble on a VFR400, one bad earth and all sorts of strange things happened...... including one tacho that wouldn't behave

[yorkie_chris]

If it's running on both but won't pull, then I'd also check you haven't pinched the diaphragms when putting the carb tops back on.

Cheers guys, I will look for the LT lead. You don't mean HT ? I wasn't that violent taking stuff out and putting it back in,


so hopefully just something knocked loose, not snapped. Like last time when I broke the splitter of the choke cable.

Thanks gents. -D

[yorkie_chris]

Definately mean LT, the -ve that goes to the ignitor box from the front coil does the tacho.
It's easy done, I've knocked it off once or twice when messing about with stuff.

Roger and wilco Yorkie. I was pretty careful with the diaphragms. I wonder if the lack of pull igniter/coil/LT lead to the spark plug could be related? I'll hopefully sort the tach and then can sync the carbs. Didn't get to that last night either. I assume putting new choke cables in will kind of self-set themselves once installed. I don't know anyway of adjusting the choke if that turns out to be an issue. Cheers.