07 ktm 85 new top end but keeps fouling plugs

[Hotrod311]

Help!! $20 plug only lasting about 4hrs under 10 hrs on top end

50:1 mix ktm plug

[HondaH8r904]

The jetting is probably too rich

[Hotrod311]

Ok thanks I will check today

[Denn10]

what base gaskets did you use? have you checked squish after new top end??  i would check jetting like said also....

[Hotrod311]

I used two gaskets and deck tool but I haven't checked it after I installed top end. Will I need to check?

[Dirtshark808]

Try 40:1 that's what I run on my 12 150sx

[Hotrod311]

Ok.. I have 122 as main jet and 45 as the other jet and I moved clip on the needle from second line to top line.. Any tips on right or wrong