Best Spark Plugs T100 Bonneville

New ones !!

Only joking , fuel is more likely the problem , modern unleaded petrol dies very quickly , it can go Off in as little as two weeks or so .
Not a bike , but a smaller engined car , I had a Hyundai excel , did over a hundred thousand km on one set of plugs !! Only used high grade 98 fuel !
How old is your fuel , and what RON/grade ??

 

Just top up once a fortnight , can't hurt and may fix this issue !

 

As above, I don't think you'll notice the difference between iridium and standard NGK plugs unless your current plugs are fouled or failing, I have never used "normal" fuel in my bikes since leaded became unavailable, always super unleaded which doesn't imop give any performance boost but I do get an extra 5-10 miles range per tank fill up and possibly if they're telling the truth, less carbon deposits. Sadly its E5 99 Ron now so only time will tell what effect that will have on our triumph engines, on my old Laverdas the fuel lines turned cloudy and fuel taps started weeping within weeks of super unleaded having E5 ethanol added so I had to get Viton based pipes and seals.

 

Some pictures?

 

PatW, thanks for posting that. Very nice. There's a guy lives near me who recently got a 1000SFC, black with gold frame, also a nice bike.

 

I had a 750 sf too, no pictures on this phone though

 

Champions every time, throw those NGK things away.

 

I do use the iridium plugs in most of my bikes and believe they do help with starting issues.
Joe

 

If you have starting issues and you change the plugs and it helps-then you needed new plugs, iridium or not.

 

The iridium only makes the plug last longer. It's the fine electrode that helps with getting the flame started by allowing the gases to flow better in and around the spark gap.

 

Laverda's

Three here , foreground SFC, mid early '70's 3c, background , even earlier 3c

The whole shed , bike just to right of Eric , "80"s jota , sliver Triumph Sprint "03" bike on ramp behind Eric a "70"s 1000 being built from scratch , engine and frame together, wheels on drum rear brake , front disc ! Tank , wiring , seat and other ancillary equipment in another shed !! All waiting their turn.
There's also an "83" RGS right rear of second photo , it just needs some ignition repair's and carburettor's need cleaning out . 4 out of the six lav's run well , RGS needs TLC , the 1000 on ramp requires some Assembly