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View Poll Results: Have you experienced the "pogo" effect on your springer?
yes 14 46.67%
no 13 43.33%
WTF are you talking about??? 3 10.00%
Voters: 30. You may not vote on this poll

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  #1 (permalink)  
Old 05-30-2010, 03:30 PM
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Exclamation Springer "POGO" effect

I know this has been covered before and I've spent the afternoon searching the old forums for solutions and there are a few threads about it.

After graduating to longer and longer rides on my shovel head I am starting to experience some extreme POGO effect on my Denver's Springer. From what I've read on the old threads, this is fairly common on some springers including Denvers. At a dead stop I can bounce the front end enough to get the front wheel off the ground, and I'm not a big guy...it's all bounce.

I don't like leaving my seat at 70-80mph and I'm sure this puts a ton of stress on the legs and the front wheel.

I'll give Mondo a call on Monday and see what adjustements can be made to correct the problem, until then I'll stick to city streets.

I would hate to have to change my front end, i really love the look.

I posted this as a reminder for anyone building at the moment and figuring out which front end to go with. "POGO" is a serious problem and should be considered when setting up your front end.
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Old 05-30-2010, 03:40 PM
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From an engineering standpoint any sprung system that has no damping will suffer some degree of "pogoing"
Can you live with it, or do you feel the need for a damper?

Tink
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Old 05-30-2010, 03:40 PM
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call him tues and let us know whats up
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Old 05-30-2010, 03:45 PM
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Quote:
Originally Posted by Tink View Post
From an engineering standpoint any sprung system that has no damping will suffer some degree of "pogoing"
Can you live with it, or do you feel the need for a damper?

Tink
Tink, it's an extreme pogo effect. My previous bike, a sporty chopper had a 6 over DNA springer on it and the pogo effect was very slight. Granted this springer is much longer, but Denver's Springers have a reputation for being extremely "springy"

I definitely need some adjustment or the front end will have to go. The current situation is extremely unsafe at highway speeds.
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Old 05-30-2010, 04:03 PM
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i have an roughly 10 over redneck. I've put maybe 2k miles on bike. i can see the wheel bouncing when i go down the road if i look at it were it touches the ground but can't feel it. it is very little bounce.
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Old 05-30-2010, 04:16 PM
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heheh there's a reason why HD went away from springers to tubes. Some company back in the 70's had a springer with shocks in it can't remember who tho.
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Old 05-30-2010, 04:33 PM
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might be something as simple as stiffer springs
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Old 05-30-2010, 04:38 PM
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I've got a 14" over DNA with 49degrees of rake, when I first fitted them they were rock solid and bounced everywhere, I've removed the inner "Compression" springs ie the lower ones, and the ride is fine with no "bounce at all.
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Old 05-30-2010, 05:57 PM
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Quote:
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heheh there's a reason why HD went away from springers to tubes. Some company back in the 70's had a springer with shocks in it can't remember who tho.
yeah, E'Steve, adding a shock sounds like the ticket to me...

Not sure if your tree are fitted but I see shock add ons for DNA's on ebay running around 80.00...I think
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Old 05-30-2010, 06:02 PM
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Hoping stiffer springs will do the trick but I want to talk to Mondo first. I don't think I'll be the first one to call him about this.
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Old 05-30-2010, 06:10 PM
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Armondo wasn't the "dude"at Denver's Choppers back in the day!

But we won't go there right now.

You may need stiffer springs...both a inner & outer on the bottom.
You can also adjust for some preload by tightening the big nut down a few threads and maybe putting some washers (if you need too)between the big nut and the acorn locking nut on your springfork post.
Understand ...it needs to give..but just enough to smooth the ride a little...nothing like a Hydro-Glide.
On some frontends you will get torsional flex of the tubing itself....but I don't think that's what you mean..

I'd call the guy who was making those crazy frontends for Denver Mullins back in the day....Freddy Hernandez!
http://www.fredsframes.com/home.htm

As a matter ..he was making them for Armondo for a while...but no longer.
Freddy is good people!

One more thing that hasn't been mentioned...is it speed related or just on sectional concrete or could it be tire balance or tire seating on the rim?
I had a tire on the rear that was causing my frontend to bounce at certain speeds.
I also had on another bike a bounce that was caused by the "mech" not seating my tire evenly on the rim. there is a line on all tires just outside of rim that can be used to tell if it is seated evenly all the way around the rim.....you would be suprised how many that mount your tire don't know anything about it!
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Last edited by Evodog; 05-30-2010 at 06:20 PM..
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Old 05-30-2010, 06:11 PM
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Never mind
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Old 05-30-2010, 11:11 PM
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Never mind
bluefin...what's up?
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Old 05-31-2010, 05:39 AM
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http://www.youtube.com/watch?v=GEbGK...&feature=email
I hope this youtube video works...Sugar Bear The quintessential springer frontend, dancing at 3:30 minutes!

Take a lesson from the master!
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Old 05-31-2010, 05:52 AM
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Quote:
Originally Posted by Tortolabob2 View Post
http://www.youtube.com/watch?v=GEbGK...&feature=email
I hope this youtube video works...Sugar Bear The quintessential springer frontend, dancing at 3:30 minutes!

Take a lesson from the master!
"If it ain't long.....it's wrong".......
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