New plugs please!

oyster · Post by **oyster** » Wed Aug 29, 2007 3:20 pm

I rode around locally at the weekend and got a good feel of the bikes performance. Tuesday morning I swapped my vintage, but clean and gapped Bosch platinums for NGK iridiums and gave the bike a run up to Yarmouth, 160 miles ish. The thottle response was crisper and the bike ran the way I thought it would on new plugs. Better and probably improved fuel consumption, fuel light came on at 160 miles. Just before my return journey this morning, I swapped the NGK plugs for the Brisk specials. The bike seemed to run more smoothly and had good throttle response. The roads I used, Yarmouth, Diss, Chelmsford, Dartford, Kent, did not allow too much high speed chasing, saw two cameras and a police mobile trap, but the overall impression of those plugs is good. Are they worth the expense? If you want that edge, slightly crisper throttle and about 5% better fuel, then yes. I still reckon the old Bosch platinums are good enough for another few thousand miles though.

r550s · Post by **r550s** » Mon Dec 03, 2007 2:48 pm

tried brisk plugs for the last 1000 or so miles - not convinced, rough running, bad starting , or could it be the recent wet weather and 8 year old plug leads? Anybody else got anything to report about brisk plugs?

madman · Post by **madman** » Mon Dec 03, 2007 6:23 pm

If the spark is big enough to ignite the petrol air mixture, then how can a spark ignite it better with different plugs? It is explosive after all.
The same goes for synthetic oil.

gus · Post by **gus** » Mon Dec 03, 2007 6:28 pm

madman wrote:If the spark is big enough to ignite the petrol air mixture, then how can a spark ignite it better with different plugs? It is explosive after all.
The same goes for synthetic oil.

Because it does, right !

Loads of info on this.
Do a search you lazy sod instead of causing mischief here.

gus

r550s · Post by **r550s** » Mon Dec 03, 2007 10:05 pm

urrgh, didn't want to start a debate about plugs - I haven't the stamina. Besides, I could write down everything that I know about spark plugs on my earlobe, with a marker pen, with space to spare. Hang on, does that mean I should head for the pelican board....

throttlemeister · Post by **throttlemeister** » Tue Dec 04, 2007 5:53 am

madman wrote:If the spark is big enough to ignite the petrol air mixture, then how can a spark ignite it better with different plugs? It is explosive after all.
The same goes for synthetic oil.

Because a big bright spark will cause rapid ignition, and a small spark will cause a slow ignition. Where fast and slow is very relative of course. It is my opinion that most plugs will give the same or similar spark when new, however some will wear down more and faster than others. The OE design plugs are particular crappy in this regard.

They seem to run fine for the time they need to be in my bike though.

On the synthetic oil, there is a huge difference between dyno and full synth which is very noticable in Jap 4-bangers which have their gearbox running in the engine oil. Dyno oil does not handle the shearing caused by the gearbox very well. Like less than a 1000 miles before you can actually and feel and hear the difference.

On the boxer, which has a seperate gearbox with hypoid gearbox oil, there is hardly any wear on the engine oil. Doesn't make much difference what you put in there, as long as it is up to spec.

Steptoe · Post by **Steptoe** » Sat Dec 08, 2007 1:43 pm

Nippon Denso plugs - No speculative or unprovable claims or promises, just excellent perfomance over 12K miles.

They just don't deteriorate at all