BLUE DEVIL 700
New member
if i want to give my valves a quick cleaning can i just pull them from the cylinder and not disconect the entire cable from the servo..i don't really want to get into the adjusting part.sled is working great(Just ask my buddy with the F7) i just want to touch them up. 
valin
Active member
Sure, you can pull the vavles out of the motor, and pull on them so the cable comes out far enough to remove the valve. You should have them adjusted every time though.
chilli
New member
valin said:
well said, I mean, the adjusting takes 10 minuites, why not be sure your dialed right in!
BLUE DEVIL 700
New member
well from reading on here it doesn't seem like a very easy job...im not great around electronic's..lol
Dave M
New member
It's not a very hard job at all.... but...If your valves are out of adjustment every time you clean your valves..then there is problem... I have almost 7000 miles on my sled, and only had to adjust 2 valves that were out of the 2-3.5mm range.... thats a HUGE widow to hit. I have not needed to adjust..checked yes.. a valve in a very long time...still in spec.
BLUE DEVIL 700
New member
i guess i'll have to read about how to adjust them then...i never have much luck searching stuff on here..lol.the sled seems to be working pretty good..it took out alot of sleds on the ice this past week
daman
New member
Actually you wouldn't need to readjust if just removing for cleaning nothing
moves when you do it,pull them clean them reinstall you'll be fine,BUT i always like to at least check it's easy to do.
to make it easier cleaning remove the pv right from the pv cable,to make that easier remove your pv cover gently rotate your pv pulley clock wise that will put slack in the cables so you can slid off the cable from the pv easier,when all done and back together when the sled starts the servo will out set the cables again,or you can just gently turn the sevo pully back
where it was.
adjusting power valves;
http://www.totallyamaha.net/forums/showpost.php?p=274355&postcount=4
moves when you do it,pull them clean them reinstall you'll be fine,BUT i always like to at least check it's easy to do.
to make it easier cleaning remove the pv right from the pv cable,to make that easier remove your pv cover gently rotate your pv pulley clock wise that will put slack in the cables so you can slid off the cable from the pv easier,when all done and back together when the sled starts the servo will out set the cables again,or you can just gently turn the sevo pully back
where it was.
adjusting power valves;
http://www.totallyamaha.net/forums/showpost.php?p=274355&postcount=4
chilli
New member
Blue Devil, I was intimidated too by this, and when it was done, I was like......."I was nervous about this?"
1 wrench and 2 allan keys is all thats needed, you'll be fine and glad to know they are set to spec!
1 wrench and 2 allan keys is all thats needed, you'll be fine and glad to know they are set to spec!
BLUE DEVIL 700
New member
thanks for the description Daman.
BLUE DEVIL 700
New member
lol..i hear yah..the sled is working so good now i was scared to mess something up..chilli said:
I thought the same thing. I was reading all of these posts and how to's on cleaning and adjusting power valves and i was really nervous and very confused. Went out to the garage and dove in and it was super simple. It helps to see everything in person, then the readjusting instructions make perfect sense.chilli said:
Not to fear, the cleaning and adjusting is pure mechanical - nothing electronic about it.BLUE DEVIL 700 said:
Dave M
New member
Good catch Ding..... slipped right over my head.. 
md11freighter
New member
I figured it would be easy, but the guy I bought my viper from must not have believed in covers for trailering. The allen screws that held the power valves in were corroded and one of them broke off in the cylinder head. I soaked the cylinder heads for 2 days with WD40, but the corrossion was real bad on the screws that I removed.
I ended up pulling the cylinder head and bringing it to a machine shop to remove it. Of course that was after I broke the easy out in it trying to remove the screw.
The good news was the cylinders still had cross hatch on them, and the pistons were well within spec. I refreshed the crosshatch, threw new rings on them and it runs better than ever.
The most expensive part was the gaskets. I'm actually happy I did it, it answered alot of questions on how these engines are built. I am a former motorcycle racer so I'm a little paranoid about putting new pistons in all of the time.
I ended up pulling the cylinder head and bringing it to a machine shop to remove it. Of course that was after I broke the easy out in it trying to remove the screw.
The good news was the cylinders still had cross hatch on them, and the pistons were well within spec. I refreshed the crosshatch, threw new rings on them and it runs better than ever.
The most expensive part was the gaskets. I'm actually happy I did it, it answered alot of questions on how these engines are built. I am a former motorcycle racer so I'm a little paranoid about putting new pistons in all of the time.