Carb issues or engine?

[hndlbarmonkey]

Quote: Originally Posted by the_depraved_one

Say.... could someone tell me what is acceptable for compression then if the book is not?

yes it's 43-75 on a stock motor

[Kenny4]

Quote: Originally Posted by Knightrider

I always check compression with the motor warm and with the motor running. My V makes the same sound when its cold but quiets down after its warm. Hasnt blown up yet

Just curious---How do you do a compression test with the motor running

Kenny

[Knightrider]

I run it on one cylinder, put the tester on the other cylinder. It will run. Otherwise the readings arent very accurate. This is how I do it on my pro street car, I do it on my snowmobiles too. 43-75 just seems low. I know on a two stroke anything under 100 psi is bad.

[g-rider]

Quote: Originally Posted by hndlbarmonkey

Quote: Originally Posted by the_depraved_one

Say.... could someone tell me what is acceptable for compression then if the book is not?

yes it's 43-75 on a stock motor

Yep.... what he said

[NovaKaw650]

Quote: Originally Posted by the_depraved_one

Thought spec was between 43 and 75psi because of the compression relief in it?

also I guess to be more specific the sound I hear is coming from the front somewhere

Correct. If it starts, the compression should be okay.
But I'm with The Speed Force; it ran good, ran out of oil, runs crappy. Look at everything that lack of oil could have affected.
You didn't do anything else other than put in more oil; i.e. worked on something else while it was in the shop for the oil refill?

[Knightrider]

OH ok. I didnt know there was a compression relief. How stupid am I? So the compression relief must come on automatically?

[GarDog]

Yes it is a spring loaded, centrifugally deactivated, pin on each cam...
which holds the exhaust valve slightly open @ low RPM...
then moves down/into the cams, once the cams/engine gets to a preset RPM...