wonder if anyone can help me, did a compression test on my mates frst last night as we thought the HG had/has gone

engine has done a max of 1700 miles, it was fine while being run in and it got some abuse after it had done its 1k miles in period

it went for a set up on friday and now the issues have started, white smoke, misfire on idle etc

its a standard engine on a 0.5mm overbore with a cvh35? cam

the results i have are

1 - 190
2 - 150
3 - 180
4 - 190

do these seem ok (yes no.2 is lower than the rest) ? as every other thread i have found states anywhere from 140-180, head is going to come off regardless!

 

no.2 is a bit to low compared to the rest
usualy looking for no more than 10% differance between cylinders
have they possibly det'd a piston when setting it up?

 

How is number 2 plug compared to the rest?

 

HG is very likely, but you dont seem to mention any water loss ?

 

I've had several people mention det now, id like to say hopefully not but im no tuner!

other than over fuelling the engine was perfectly fine for the 1700 miles it did before being set up

as said via text yesterday buddy, plug 2 was spot on, cylinder 3's plug was black, yet its compression test result look ok?

that was my bad on the vagueness, i was in a rush !

the header tank was pressurising and it had lost all of its water from what we assume to be the header tank as no major leaks were found when it was refilled!

the white smoke was noticed after the header tank was filled up and a short journey back home was done to drop a mate off!

 

As mentioned in another compression thread, the details are very important.

Head off time.

 

cheers for your help buddy