Spark plug status

[kejj]

The plugs are Genuine.
I mostly wanted to hear if the b7es could potentially harm my engine since its so clean on the top.
I also wanted to hear how to make the b8es usable and that would be to run a new b8 on 2% mixture instead of 4% right now.

To go with the b7 and increase the oil to fuel ratio would mean more than 5% and thats seems like overkill.

So, none of you think that they look like they would harm the engines?

I will check towards the chart as soon as I will get to my garage again.

[goldeneye]

leave your oil ratio as it is, use your b7es for round town work, and pop the b8es in when your gonna do longer journeys. i"d just leave the b8 in if its running ok.

[eibargum]

Personaly i,d like to be between the two plugs as regards colour, iam no expert mind you , I dont rely on the colour of the plug totaly unless its miles out, because they add stuff to fuels to keep car engines clean, i much perfer to dyno mine, and have a preference for Nippon Denso,s, 24 for steady rideing, going to a 27 for long motorway rides on the muggy, for long motorway rides on my RB i use a 31, never oil,d it up yet but if i did i,d rather change a oil,d plug than a piston .

[kejj]

Personaly i,d like to be between .

Same here thats why i think I should run B8ES all the time and use 2% oil fully synth. Now I'm on 4% Minerall oil.

[goldeneye]

Personaly i,d like to be between .

Same here thats why i think I should run B8ES all the time and use 2% oil fully synth. Now I'm on 4% Minerall oil.

nowt wrong with good mineral oil man..... castrol TT , or actevo as its called now. why would you jump from 4 to 2 %? try 3 on fully synth if you want, but your only riding round town, and ive thrashed the arse off my cast barrel on mineral 4% and its been great. and semi 4%, and whatever i could get at the time 4%. just ride with the seat of your pants man, if it feels ok , just stick with it. your losing sleep over the colour of a spark plug for fucks sake. chill man

[Dryballs]

maybe use the B7 and go up a few sizes on the main jet?

I'd try and get it running right with the B7 and 3% that would be ideal, just swap plugs out before you go blasting down the M1!

[coaster]

maybe use the B7 and go up a few sizes on the main jet?

I'd try and get it running right with the B7 and 3% that would be ideal, just swap plugs out before you go blasting down the M1!

If it's only been used around town I doubt the main jet comes into the equation very often. You could check your air filter maybe but otherwise I'd go with what Goldeneye and leave the B7 in there for town use.

Also, as Byron said, plug chops taken at fixed throttle openings are the only reliable way of reading anything from the colour of your plug.

[kejj]

But doesn't the b7 look to hot?
4% generates more smoke on mineral oil to That's why I'm thinking of 2% and B8 would solve the oily b8 plug now that I'm 4%.
Switching between the two grades of plug requiers me to reset the idle position on the carb.

[coaster]

But doesn't the b7 look to hot?
4% generates more smoke on mineral oil to That's why I'm thinking of 2% and B8 would solve the oily b8 plug now that I'm 4%.
Switching between the two grades of plug requiers me to reset the idle position on the carb.

3% fully synth would be ok but I personally wouldn't even run my mugello on 2%, it's not the cylinder walls that suffer, it's the big end that could be under-lubricated

[J1MS]

Everyone interprets a plug slightly differently, but usually from their own personal experience and riding style.

If the B7 had just come out of my engine and I had been riding it, at or near full throttle, then the colour and deposits on it would for me be OK. On the other hand, If I had just done a 5 mile bimble at little or no throttle with no real load on the engine then I would be a little concerned with what might happen when its given a fist full, as I would like it a little richer then mainly to compensate for the extra heat and maybe a cooler plug.
The B8, to me looks like its just too cold a plug for the riding style its been subjected to, as the deposits are fairly heavy and black with a hint of brown at the tip.
What would happen if on the B8 it was ridden hard for a 100 mile stint, as some riders do when attending a rally when the ferry leaves in one and a half hours, but you have to get there. Then under this type of use the same B8 plug with the engine now under duress might look a little more like the B7 and with no re jetting required.
But as I say everyone interprets plugs in there own way, especially if you know how its been run.

When you are doing this kind of comparison I think its best to try to be consistent with the fuel used and the amount and type of oil added. to get a consistent plug reading and comparison.