spark plug eater

[FreeStyle Digby]

hi
i have 2 questions please
1 whot plug should i be using in my r it is on stock barrel on1.5 over bore ,38mm carb with a 160 main , Paul turner "race pipe", twin air filter with ally air box and a hinson adjustable timing plate set at 0 using 97 ron fuel

second question is it seems to eat plugs i currently use a NGK br9es and it runs fine for about a hour then it starts to miss and backfire once it hits band then if i fit a new plug it runs fine again for about another hour then the same again and its costing me a fortune in plugs :)

any help would be great

cheers F S D

[250r4life]

most people use NGK b8es or br8es...

if youre fouling plugs youre jetting is likely too rich

[GPracer2500]

What he said^

The 8, being a "hotter" plug, will be somewhat less prone to fouling. If your jetted rich on purpose for some reason then a hotter plug all by itself might provide relief.

[ESrider]

Is it black and fouled when you change it?

[kiesta00]

almost sounds like your spark plug wire is comming loose after a few minutes of riding, or somethings up with your ignition. try that 8 plug and see how that works. Whats your premix ratio at?

[FreeStyle Digby]

thanks for the replies
i do run it slightly rich just for safety bet when i take the plug out its not fouled up just a little dark
it dose not have the best spark so im thinking it could be down to a ignition fault ????
could my stator be on its way out ???
the other thing that could be connected is it dose not start very well i really have to jump on the kicker to get it to fire but once running its fine

oh and i run it at 33:1




cheers F S D

[novaracr70]

are you gapping your plugs to .18 ? if not it gets some deposites on it and the ignition will not fire the plug well. allso run a b8es and jet to that plug