Im going to run a NGK B5HS spark plug....

[fall_down_stand_up]

It will run hotter....Im running a NGK B6HS right now....oppinions????
John-John

[Norman]

google ngk spark plugs it will tell you what the numbers mean has to do with the spark plugs heat range not how much power or heat your engine will make.
look here this might help

NGK sparkplugs information and specification

[Venice Motor Bikes]

The NGK 5 is a hotter plug than a 6... I run a 5 in the winter & a 6 in the summer.

To answer your question, a hot or cold plug will not make your engine run any hotter or colder, but the amount of heat from your engine can make the plug run too hot or cold; (& a plug thats running too hot or too cold can make your engine run like s**t!!!)
A plug thats too cold isn't hot enough to burn off all the gas & oil that builds up on it & can foul out; A plug thats running too hot can get glowing red hot spots & cause pre-ignition!!
Thats why when my engine starts running hotter in the summer, I switch to a slightly colder plug (& visa-versa).

[mycam8u2]

i run the b5hs all year.works fine for me

[fall_down_stand_up]

I put it in this morning and ran for about 3 miles and I think I hear it pinging....Im going to go out for a long ride right now and see how it does....Willl report back to you....Thanks for the replys....
John-John

[Rockenstein]

IMHO a 5 is too hot with the stock timing...and I didn't like a 6 much either. I tried a 9 but it wouldn't clean itself very well on a 32:1 mix and stock timing although it remedied the indications of detonation I was hearing and seeing on the other plugs I tried. I've put about 1200k on a BPR7HIX, a 40:1 mix and slightly retarded timing...at 2110 km the plug is clean, idle is low and smooth and my GPS says I top out at 54 km/h

With regards to how I tweaked the timing...I don't use the key that fixes the magnet rotor to the crankshaft.

[fall_down_stand_up]

After the ride I can honestly say I can tell no difference....There is no pinging and it runs the same....I moved the needle down a notch and it still runs the same....Im going to move it up a notch and see how it does....
John-John

[BarelyAWake]

I ran a B5HS all summer, WOT and distance trips (1500 some-odd miles) - never had a problem w/it. I just switched to a B6HS and so far have noticed no difference at all.

I ran the B5HS simply because that's what was available at the time, I switched to the new B6HS because the B5HS was becoming lightly corroded on the outside and it annoyed me to see it

gdang ocean o_O

[fall_down_stand_up]

Bikes running the same after moving the needle up a notch....You would think there would be a difference....
Im going to keep this plug in and check it at the end of the day to see how its burning....
John-John

[BarelyAWake]

You runnin the stock carb ona 66cc? If so - is it the old style or the new one with the second fuel petcock on it?