What is the EX valve suposed to be adjusted at its really confusing me, can any body expain it, the book says 360 counter clockways that keeps the valve open, isnt it suposed to be closed when no throtle is applyed, and what should i look for in the sight glass the arm up or down and when ?

 

at idle, the valve should be open, through the sight glass the arm should be down.
once the RPMs increase enough to close it, the arm goes up(rod pushes it up.)
the spring adds just a slight amount of additional pressure and allows you to tune the RPM the valve closes by how far you turn the ****... a significant change can be had with only +/- 1/4 turn from 360CCW.

 

The valve dosent move really at all, at an idle when i rev it it will move a very small amount not even a quarter of the way up, and i have my spring set at 360 cc what else can i check for ?

 

During the restoration of my 500, the ex valve governor was broke and had to be replaced. The adjusting spring (on the other side) is very fragile and should be changed for good mesure. You might also have a broken plastic clip that holds the push rod in place or even a seized bearing on your valve itself. It's always a good idea to completely rebuild your valve every time you have the jug off! Bearings seals springs and clips

 

the valve moves freely and all the connections are on, the valve set screw is suposed to go in the set screw hole in the valve right ? its lik it wants to move but wont

 

F250r, are holding the engine rpms at a constant 4-6 grand and the valve arm still doesn't move into position or are you just "blipping" the throttle and watching for valve actuation? Mine is freshly rebuilt and even it doesn't react instantaneously to changes in engine speed. The antiquated exhaust valves used on LT's are no where near as effective as the newer guillotine type exhaust valves such as is used on most all snowmobiles today.

 

i dont want to rev the bike constantly just yet im still in the breakin process i have about 3 hours on it, you said the valve moves slowly ?

 

With a quick rev, your valve should snap open...like mine does! There is something wrong. Your governor could be broken. It runs off the end of the crank and spins a bowl with ***** inside that push a second bowl out with centrifugal force somewhat like a snowmachine clutch. This could be broken!

 

what part could be broken specificly ? theres not much to the whole set up.

 

The exhaust valve governor. It;'s the part that fits between the cover and the actuator. It's about 2 inches long and has a couple of saucers on it with ***** inside...everything mounted on a small shaft. MY shaft was broken and the ball were scatered at the bottom of the case. If there is anything wrong with this piece your valve will not work