Spark plug #1 black

[Brendan W]

I should said that I drove with this plugs 100 km.
And Sorry I don't understand. U mean swap 4 to 1 end of the cord --- so other end of cord (that which is attached to coil) stay on same place??

Yes. Just swap the plug cap ends of the lead over.
You could have a rich mixture or a weak spark due to a crack in the lead. The plug looks to be slightly wet which could be fuel or oil especially with those lumpy deposits.

[sihi]

Thx. I try tonight. Gona post results later.

[sihi]

Results are bad. After 70km it start to be black it seems to me like carbon. But I should say that before I bought bike there was same little leakage over #1 valve . I changed sealing and it starts slowly again. also compression test was little bit strange #1-190 #2-170 #3-170 #4-175. I don't know where should I start first

results.jpg

[hannibal]

The plug size changed at the same time as the newer head design which the 650 has, might have something to do with that.

Thanks for the explanation...

[sihi]

Hi . what it can be that leakage is all the time from one place even after I changed sealing?(can it be pressure from cylinder?)

[tkent02]

You need to start reading.

http://members.dslextreme.com/users/bikecliff/