dupper
New member
98 venture took it out today for its first ride new bushings and buttons on secondary jackshaft bearings felt tight. But after 15 miles my jackshaft bearing was blowin apart and buttons worn through to the helix and even worn the clutch sheave where the buttons sit, i'am wondering what could fail so bad so fast to cause so many problems in so short of a time??? Also which way does that shaft come out I'am thinkin through the chaincase side, any info on any of this situation would be greatly apreciated Thanks.
The shaft comes out the chain case side.As far as the buttons go I don't know. Maybe severe vibration from the bearing going out? Jack shaft bearings are known go go bad especially if not serviced ( greased ) atleast once a year. Mine get greased up atleast twice a year.
YamahaGuy-1
New member
Not to steal your thread but where and how do you grease the jackshaft bearings?
bluemonster1
LIFE MEMBER ONLY ONCE!!!
you can only grease the one outside behind the secondary.Pull bearing seal off with a pointed object or small screwdriver.Be carefull not to cut the seal.This exposes bearings inside..just pack some good syn. grease in there and snap seal back on tight .Same can be done with the driveshaft bearing speedo side.
the clutch was possibly damaged when installing the buttons. If hit off center, they can crack the towers behind them. The other thing that I see damage these is installing the helix wrong. Before tightening the helix down, you need to spin the clutch apart a little and throw a screwdriver or something in it so when it is tightened it is not trying to force the button back against the towers behind them.
As far as losing the bearing in the jackshaft after installing bushings, I would guess your bushing is not in the clutch anymore. If installed wrong, It can stick to the shaft and get pulled out of the clutch sheave, then get jambed into the bearing. I havent see one destroy a bearing but have seen them ruin the seal. When this bushing comes out, your sheave puts loads on the towers they are not designed for which also could have cause their demize.
When isntalling bushings, dont hammer them in if you can avoid it. they need to be pressed in. For good measure, they should be installed with bearing lock.
When you install that shaft, make sure you tighten everything up in the chain case before tightening the set screws on the bearing.
good luck
As far as losing the bearing in the jackshaft after installing bushings, I would guess your bushing is not in the clutch anymore. If installed wrong, It can stick to the shaft and get pulled out of the clutch sheave, then get jambed into the bearing. I havent see one destroy a bearing but have seen them ruin the seal. When this bushing comes out, your sheave puts loads on the towers they are not designed for which also could have cause their demize.
When isntalling bushings, dont hammer them in if you can avoid it. they need to be pressed in. For good measure, they should be installed with bearing lock.
When you install that shaft, make sure you tighten everything up in the chain case before tightening the set screws on the bearing.
good luck
dupper
New member
well Betheviper your hit it right on the heads there, yes the bushing did walk out taking out the bearing, for some reason unknown to me i totally forgot to loctite the new bushing as I usually do so this was a mistake on my part thats going to cost me a few parts now. I now need a outter sheave possibly inner as well depending if the bushing spun, a helix, bearings, seals, a belt anyone have anything to add..
Rustman
New member
yikes, same thing happened to me just the other day. I've never replaced that bushing before and I didnt take any precautions to keep it in place. I noticed within about 30 secs something was terribly wrong. I stopped, felt my clutches and they were very hot. Sure enough that bushing had decided to pull a houdini, upon replacement I wasnt sure what to use so I used some blue loctite I had. I've ridden about an hour or so since the loctite and it hasnt moved yet. Luckily I noticed it quick enough and nothing was harmed. i will be checking that bearing seal though a little more closely.
another trick if you dont have locktite is to use a sharp punch and divit the clutch around the edge of the bushing, raising up the material at the bushing edge.
I've had a number of these buhings "walk" out on me. I have used the dimple method mentioned above many times along with locktite. The thing about locktite is that it requires friction to activate it. What is very strange is that I have never had this issue on a Viper, only on lower powered sleds. That one I cannot explain. Anybody got any ideas what causes these to "walk" out?