fouling plugs

[roostinblaster]

i have a 94 blaster .40 over ported and poslished 4mill stroker crank and
34mm Keihin carb my problem is i keep fouling plugs put a new one in yesterday and rode for a couple of hrs then messed around with it today after work and it fouled again i think it has the factory jet in it

 

[mr_3_0_5]

you premixing??

 

[roostinblaster]

yea im mixing 40:1

 

[mr_3_0_5]

i suggest mixing 32 to 1
what size jets you running?

 

[roostinblaster]

im not 100% sure just got the bike do u think the 40:1 is causing it to be too rich

 

[mr_3_0_5]

i dont see how it could its less oil. i think your jetting is off.

 

[roostinblaster]

ill take the carb off in a little while and check to see what size jet is in it

 

[mr_3_0_5]

whats your plug look like? what oil do you use?

 

[roostinblaster]

its black and wet

 

[roostinblaster]

im using klotz oil

 

[darealblaster]

its the jetting,not your mixing becuz the 40:1 isnt a rich amount, your jetting is off.

 

[blasterfreek30]

its black and wet

it waaaay to rich, lean it out abit

 

[roostinblaster]

it is also advanced 4 degrees

 

[roostinblaster]

is that the little brass screw on the side where the air cleaner is

 

[CC&Fabb]

Well, none of that stuff you mentioned about you bike is anything close to stock. So, it has to be your jetting. If you plug is black and wet that means that there is gas on it that is not burnt sitting on the plug. I would maybe move down 2 jet sizes and do a plug chop and see how that works out for you.

 

[roostinblaster]

i just pulled the carb off and pulled the plug off of the bottom of the carb and took that jet out and it said 155

 

[TheWalkingPlague]

i am havnt a problem with spark plugs also so keep this going i would like to know what is up

 

[dustin7021]

i just pulled the carb off and pulled the plug off of the bottom of the carb and took that jet out and it said 155

try going to a 153

 

[snakedoctor99]

I had the same problem on an old cr80r. It would foul plugs and run like crap. I cleaned the carb and found that one of the jets was partially clogged i cleaned it and it stopped fouling plugs.

 

[roostinblaster]

i went up and got a 152 and 150 jet from the store today thats all they had im gonna try those 2 tomorrow see what i have then go from there hopefully have it ready by this weekend i have a boy that wants to run his brute force against the blaster thats bad idea #1 on his part