02 viper secondary belt height

T

tmcb71

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Final after 11 months got to take the viper out and see what I bought runs as good as it looks. All in all runs good and am very pleased. Couple things I can't quite figure or need some guidance in regards to the primary, secondary and belt height.

Wot rpm 8900-8950 seems to be little high from my research
Engagement 4000
Primary spring G-W-G
Secondary spring Green
Secondary preload 60 deg position 3 & 3
Belt width 1.35"

The problem is the belt sits below the secondary by a good 2-3mm even when adding shim can't get the belt to raise up in the secondary. Spring,shoe ramps bad? If I wiggle belt I can get it to raise up in the secondary seems like under normal conditions there isn't enough force to push belt back to the top. With no belt secondary seems to open and close smooth. What should I look at next?

Thanks
Todd
 

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1.) what weights are in the front clutch with the green /white/ green spring 45/136 as thats a pretty powerfull spring. The stock spring was a yellow/white/yellow 45/128, the stock weights would say "8ek" on the sides of them near the top. You want 8500-8600rpm peak on a single pipe viper for best results.

for the belt not coming to the top, you could have a few issues:

1.) when you put the belt back on after changing the shims on the 3 little bolts in back, you have to put on the parking brake and kinda pull back on the belt while trying to spin it in reverse at the same time, it will then come up in the sheaves. Once you get the hang of how to set it though it saves a bunch of time setting it up without riding it then going back to garage redo and so forth. Also, the bolts that go in the back of the secondary could have been changed and are too long, the factory ones have a 8mm head on them and a little nub that sticks out on them beyond the thread to touch the wear plate inside the clutch. see if they are the correct bolts.

2.) could be also that someone has placed a shim in between the sheaves to space it for another belt, I would take off the clutch and look if the first option doesnt work.
 
mrviper700 said:
1.) what weights are in the front clutch with the green /white/ green spring 45/136 as thats a pretty powerfull spring. The stock spring was a yellow/white/yellow 45/128, the stock weights would say "8ek" on the sides of them near the top. You want 8500-8600rpm peak on a single pipe viper for best results.

Didn't take weight out but looks like it says 8ek. Would like to get rpms back into correct range

for the belt not coming to the top, you could have a few issues:

1.) when you put the belt back on after changing the shims on the 3 little bolts in back, you have to put on the parking brake and kinda pull back on the belt while trying to spin it in reverse at the same time, it will then come up in the sheaves. Once you get the hang of how to set it though it saves a bunch of time setting it up without riding it then going back to garage redo and so forth. Also, the bolts that go in the back of the secondary could have been changed and are too long, the factory ones have a 8mm head on them and a little nub that sticks out on them beyond the thread to touch the wear plate inside the clutch. see if they are the correct bolts.

Bolts are 8mm and have nub. I have 2 spacers behind bolts and when belt is just on secondary it rides above secondary. When I put belt back on primary also it will ride low. Seems like the secondary wont pull shut enough to force belt up.

2.) could be also that someone has placed a shim in between the sheaves to space it for another belt, I would take off the clutch and look if the first option doesn't work.

Have had secondary apart didn't find any shims
Click to expand...
this is my 1st experience working on clutches so any advice is greatly appreciated. Thanks

Todd
 
Is it sitting low in the secondary after running the sled or just after putting the belt on?

Does the belt feel like it's tight on the primary shaft? if it is the center to center and alignment may need adjusting.
 
After running it will be low. Center to center seems to be in range around 269mm +- 1 but don't have an actual gage. Belt seems to be pretty loose...seems like a lot of deflection if you push on it.
 
tmcb71 said:
After running it will be low. Center to center seems to be in range around 269mm +- 1 but don't have an actual gage. Belt seems to be pretty loose...seems like a lot of deflection if you push on it.
Click to expand...

well thats good then. should be in the secondary. Just to be sure, you did wind the secondary spring the right way?
 
Using hole 3 and 3 which should give me 60 degrees of preload. Think It's right with no belt it closes
 
ok, well your rpms are too high because it has the wrong front primary spring in it, you need to put in a yellow/white/yellow primary spring, the one thats currently in there is too strong for the amount of weight of the 8ek arms,so thats that problem solved.

onto the rear clutch

remove the rear clutch from the sled and take out the 3 little 8mm headed bolts on the backside and post pics of them. there has to be something wrong with the bolts and the shim plate only way it can keep the clutch from going all the way closed. with no belt on it do the sheaves touch down inside the clutch?
 
also, what helix is on this sled??, it might be steep and you only using 60 degree wrap allows it to sink down if the sec spring is tired.

if in doubt post pics so we can "see" what we are dealing with to help you.
 
Can the shoe ramp be wore to much? I have noticed that with belt on the secondary doesn't slide back out to end of shaft like it does without belt. The secondary will rotate all the way back counterclockwise but is like spring isn't strong enough to push it out and the shoe ramp isn't making contact with the ramp to help? Maybe these pics will help
 

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mrviper700 said:
also, what helix is on this sled??, it might be steep and you only using 60 degree wrap allows it to sink down if the sec spring is tired.

if in doubt post pics so we can "see" what we are dealing with to help you.
Click to expand...
the only number I could find 9770 looked like it was scribed on.
 

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Gitterdun1985 said:
is the belt new? if it isn't put a new one on.
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Not sure how old belt is sled is new to me but it measures 1.347 which seems to be well within spec
 
staggs65 said:
9770 is a 49/37, but there are 9770 with letter suffixes that are different angles
Click to expand...
As you can see in picture above scribed into helix on bottom is the 9770 that is the only markings other then the numbers on the face that represent the spring position
 
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