Fast Slider

[JRossi17]

Carbs are done being rebuilt for the most part and 99% back together. I notices on carb 2 my slider goes back down faster then the other 3. Is that something to be concerned about?

[Nessism]

Sounds normal. Just lift it up and make sure there is some damping when you let go.

[scott]

Sounds normal. Just lift it up and make sure there is some damping when you let go.

What does it mean if there is little to no damping?

I'm having the exact behavior that JRossi17 describes with the same #2 carb. However, I get almost no resistance when I let go. It seems to smack down whereas the other 3 seem to "float" down.

[hikermikem]

What does it mean if there is little to no damping?

I'm having the exact behavior that JRossi17 describes with the same #2 carb. However, I get almost no resistance when I let go. It seems to smack down whereas the other 3 seem to "float" down.

make sure the diaphram is seated correctly in the groove under the cap... check it isn't ripped or torn either.

[scott]

make sure the diaphram is seated correctly in the groove under the cap... check it isn't ripped or torn either.

Thanks - I'll take a look.

After I had already reassembled them the last time, I read on here that you can put a little Vaseline or something on the diaphram to get it to stay in place while putting the cap on. I'll give that a try assuming it's not ripped/torn.

Also, I've been riding the bike with it like that. Is there any particular behavior you'd experience or see if the diaphram on a carb is not seated correctly?

[Steve]

After I had already reassembled them the last time, I read on here that you can put a little Vaseline or something on the diaphram to get it to stay in place while putting the cap on.

When I re-assemble a carb, I fold the diaphagm DOWN, so the edges will sit in the groove with the slide still in the raised position. Stick a finger in the carb throat, hold the slide so the edge of the diaphragm just rests in the groove. With your other hand, put the spring in place and place the cap on the carb. Using your thumb on the hand that is holding the slide UP, hold the cap in place against the spring pressure and get a couple of screws into the cap. When you have the screws in place, you can finally let the slide down. I have found this to work every time, as long as the diaphragm was not physically twisted out of shape.

Also, I've been riding the bike with it like that. Is there any particular behavior you'd experience or see if the diaphram on a carb is not seated correctly?

If the diaphragm is not seated correctly, the slide will not lift. This will restrict the amount of air that can go through that carb, reducing your overall power and smoothness of operation.

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[mike-s]

Compare these two

bad:

http://www.youtube.com/watch?v=k1YOkoekIeA

good:

http://www.youtube.com/watch?v=L4knwjlNC1o

[scott]

When I re-assemble a carb, I fold the diaphagm DOWN, so the edges will sit in the groove with the slide still in the raised position. Stick a finger in the carb throat, hold the slide so the edge of the diaphragm just rests in the groove. With your other hand, put the spring in place and place the cap on the carb. Using your thumb on the hand that is holding the slide UP, hold the cap in place against the spring pressure and get a couple of screws into the cap. When you have the screws in place, you can finally let the slide down. I have found this to work every time, as long as the diaphragm was not physically twisted out of shape.

Thanks for the tip!

When I took the cap off, it seemed like the tab was in the notch. I checked for rips/tears and didn't see any. Reassembling as you describe does have the slide coming down with more damping. The first time I tried it, it seemed very good - coming down softly. After a few more tests, it starts hitting the bottom with a thwack again but it still seems better than it was. There's a least some damping just not nearly as much as the other carbs.

I guess I'll have to live with it or it look for a new slide.

[Steve]

Take a good look at your diaphragms. Hold them up to a light and stretch them slightly.

Here is what you DON'T want to see:


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