I blast mine and reuse them.
spark plug cleaner
Mart



Mart
click edit to see how it is done
Merv

yup wire brush, clap em in a vice and scrub the crap off of em with a softish wire brush
Merv

Thanks for the working link.
Plugs I can do......
Links.......Well
Mart

i run premix at circa 25:1 and with ordinary plugs had the occasional one foul up. I then changed to these and haven't had one foul yet:
http://cgi.ebay.co.uk/L4G-plugs-for-Kawasaki-H2-KH500-Suzuki-Yamaha-YDS7-RF5_W0QQitemZ280465279971QQcmdZViewItemQQimsxq20100217?IMSfp=TL100217207001r31936

“Fouled: This occurs when a build up of deposits is great enough to provide a path for the spark to run along the insulator surface all the way to the metal shell without creating ignition.” Yamaha Service Manual

       

i am a tad too rich 1/4 to half throttle but when my carbs are out of balance it runs rough as fook especially when cruising at 40. hence the fouling.
carbs go out of balance every time i touch my carbs cos the throttle cable is knackered. sometimes by as much as 10mm!!
i ordered a new one but got a flat top carb cable ie carb cables far too short.
i wont junk the plug then maybe try carb cleaner and set it on fire. and the rest of the bike is gonna get that treatment if it deosnt start behaving.

thing is i'm only doing short runs and the engine barely gets up to running temp. when it does warm up the richness isnt as obvious. its a bit too cold for me to be trying to get things spot on. i'm also waiting for some bigger mains to be delivered.

i have the standard pilots and i have noticed i can make quite a bit of difference to how it runs by adjusting the air screws. i tried to screw them in a bit last time and it ran a bit rich hence the fouled plugs.
i am still trying to get the mains sorted. i have found a supply of nylon mikuni jets here
:RTQ:MOTORS:1123">http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=180247630968&ssPageName=ADME:RTQ:MOTORS:1123
even with the $3.50 shipping for twelve jets they are cheaper than buying in uk. i vaguely remember trying them in the seventies and can recall the threads are very easily stripped by the ham fisted.
are they any good?

i am paying £2.50 each from yambits in uk for brass, but he only goes up to size 260. £3 each from another supplier plus £7 pounds postage.
i should just try a pair of 280s and then if thats weak then i know not to buy the 250 260 and 270's. who knows i might have to go up to 300!! or even higher!
it seems to me that up to just under half throttle is slightly rich with the 1mm of washers under my bottom notch clipped needle but from half to full throttle is still definitely weak. once ive got the full throttle mixture sorted out then the .4 to .75 thottle might be harder to sort out cos the needle and needle jet are giving me rich and weak mixes. different taper?
dave, would the 2mm air jet mod make things even more complicated?
if not should i do that first?

just to sort my head out, in a couple of hours i am gonna take my main jets out completely. purely to witness my bike running rich at full throttle. cos at the moment i cannot imagine that.
and also i will see at what throttle opening the needle and needle jet hand over to the main jet.
if it runs crap from 1/3rd throttle upwards i know the main jet is influencing the needle jets operation and so need to sort that first. you or others might have done this but you cant beat first hand experience.
i'm off work due to the weather today and its either that or i have rumpty pumpty with my aging wife.
she doesnt rev much nowadays....

Originally posted by GAZZATT2 have you tried motocarb for jets ?

maybe, will do now cheers gazzatt2.
2.50 each from yambits was good. i email dave @yambits or use the on site messaging and he has never replied.
if someone had a phone number i could try ringing him to see if he has bigger.
a lad on ebay from barnsley sells 10 jets for 21.80 posted. in smaller sizes. ive asked him if he will do 260-300 for the same money.

edit
the link was already purple on my google. he is only a quid a pair dearer than yambits but i think his postage is very dear.
got quoted 3.5 dollars shipping from usa and i think motocarb wanted 8 quid and yet motocarb is only down the road.
thats a dave freist road btw.

2nd edit gazzatt2 do motocarb offer aircooled rd members discount?

YAMBITS
David Newboult
Unit 9 Poplars Industrial Etate
Boroughbridge
YO51 9HS York, North Yorkshire
United Kingdom Phone: 01423 324394
Fax: 01423 325436
Email: mail@yambits.co.uk


I had some jets of moto carb recently did not charge me £8 postage only about £3 Steve there knows his stuff

no discount that I am aware off