Breakout+ rebound clunking

[Straw]

So...there's a bike I might buy used that comes with a Breakout Plus. The problem is that the rebound seems to 'clunk' as if it was topping out sometimes.

However, because it sometimes cluncks in the middle of it's travel, I know it's not just topping out. It usually happens during quick compression/rebound situations. I've only ridden it on pavement so far, but I assume it would be clunking quite wildly on stutter bumps at speed.

Has anyone else had this problem? Is it an oil level problem, or an SPV problem?

Any other ideas?

Thanks for any help;

[switch]

I've read about this before on this board.

Do a search for "clunk" or "knock" and either "Sherman" or "Manitou".

If I recall it was a simple problem, like something not sitting right in the internals.

[Straw]

cool...I searched "sherman rebound'' but didn't find what I was looking for.

I'll try what you suggest...

[switch]

Try this link - not a lot of info, but a lot more than nothing. ;)

http://bb.nsmb.com/newforum/showthread.php?s=&threadid=40557

[Straw]

Thanks for the link...it helped, however my problem is a bit different. I think it's not a spring issue, but possibly a rebound/SPV issue.

Thanks again...

Any other tips anyone?

[switch]

Be patient, the tips will come. There's a lot of people on the board who know their Manitou forks.

[Straw]

Yea, I get ancy (?) whenever I start a new thread!

[buddylee]

its not a big deal your spv valve is sticking ......are you from the staTes ?? if so contact answer usa 1 800 423 0273 and they will give you an ra to send it in to get repaired and probably upgraded to evolve

[Kye]

if it sticks you start at zero psi and compress the fork the move up in 20 psi increments to the max, and the sticky spv should be gone! hope that helps, i believe that was the solution:)

[M13]

Tri cities misses you^


one of my buddy had the same problem on his slider when he got it, then he took it to that guys shop and it is soooo ever smooth.

[Straw]

Na, I'm in BC...

Thanks for the tips guys. I'm happy it doesn't seem to be a huge problem.

[Straw]

Originally posted by Kye
if it sticks you start at zero psi and compress the fork the move up in 20 psi increments to the max, and the sticky spv should be gone! hope that helps, i believe that was the solution:)

Did that, and the problem is now gone.

Thanks for the help!

[Kye]

awesome:thepimp:

[Bryce]

yes, its tempting to let all the air out to get that buttery smooth feel but it will clunk like a madman

I did that to a friend's fork like "gee, I'm such an expert, I'll just let some air out" and it clunked the rest of the way down the mountain. Ooops.

[Kye]

its not that all the air was out, it was that the spv valve was sticking, so by letting the air out and pressureizing it, it releases ther valve and allows it to work properly

[Buzom]

if it sticks you start at zero psi and compress the fork the move up in 20 psi increments to the max, and the sticky spv should be gone! hope that helps, i believe that was the solution:)

Hey I am reviving this thread because I am having a similar problem with my sherman. I did everything as was recommended above and thought I had it all sorted out. But about half way through my ride today the clunk was back, aaaaahhhhhhhhhhh and the fork bucked me for the rest of the ride. So my question is, am I doing this wrong? I let all the air out, cycled the fork; put 20lbs in cycled fork; and kept doing that till about 60psi and all seemed well. Any other tips from sherman owners would be great...

Thanks
S

[switch]

Did you try adjusting your rebound and see if that makes a difference? I've had the clunking on a fork, and was able to make it go away by adjusting the rebound.

[Buzom]

^ nope it definitly not the rebound, I played with that plenty and all it does is slow the clunk down a little bit. I'm pritty sure its the SPV valve from what I have seen describe here, just not sure how to go about getting it back in working order. I know there are a lot of sherman owners on here so hopefully on of them has gone through this?

[zahgurim]

I've got a BO+ on my Evil. I haven't had any problems with it, other than your mentioned klunk.

After it was broken in, it started klunking at anything below 65psi. Solution? "Then run it at 65 psi." That's coming straight from the Manipoo techs at Interbike, too.

I'm assuming you have access to a good shock pump... Just play with your pressures, and slowly increase it untill the fork stops klunking. 65psi was the magic number on mine.

[switch]

^ nope it definitly not the rebound, I played with that plenty and all it does is slow the clunk down a little bit.:lol:
Well then, it sounds like your rebound is working.


cool...I searched "sherman rebound'' but didn't find what I was looking for.

I'll try what you suggest...Try a search on "SPV clunk", or something like that. I seem to recall posts about clunks and early SPV forks.

[Buzom]

So, I am pritty sure that it is my SPV valve that is clunking and since I work for pritty much the next two weeks straight anyways the fork is going into the shop. Marty's here in vic is gonna have it sent to OGC for me and get the fork all tuned up, I assume that my fork does not have the evolve internals installed so hopefully that helps out. It will be nice to have the fork all buttery for the spring.....mmmmmmmmmm butter

[Buzom]

I've got a BO+ on my Evil. I haven't had any problems with it, other than your mentioned klunk.

After it was broken in, it started klunking at anything below 65psi. Solution? "Then run it at 65 psi." That's coming straight from the Manipoo techs at Interbike, too.

I'm assuming you have access to a good shock pump... Just play with your pressures, and slowly increase it untill the fork stops klunking. 65psi was the magic number on mine.


Yeah if I run a higher pressure the clunk will go away but it has to be pritty high like 75+ and I want to be able to run it lower to increase the small bump sensitivity. The fork needed a tune up anyways so this was the perfect time to do it. Hopefully it helps :dizzy: if I still have to run it at that high a pressure after it gets tuned up I will be kinda choked...

[apeshape]

3 letters. O-G-C.

I had a similar problem with my slider+ but it came back with a fresh sumpin sumpin to make it better. Love those guys. Anytime I've sent my forks in they've come back better than new.