another mono delema

[REDSLED1]

Hi guys; going through some threads on mono set up and couldn't find what i was looking for for my situation so here goes. last year my er would bottom out on large bumps or dips. Had the spring turned up stiff but would still bottom some. I got the shock revalved,and put c-clip on 2nd notch. spring is now 12 3/4 in long when sled is hung up, pushed rubber slider against shock body, lowered sled to floor then sat on it.(i weight 250). raised sled again and measured gap at rubber slider, 26mm sit in. This goes against all of what i was reading and don't know where i stand. Any help from the bros would be appreciated.

 

[ReX]

26mm is not enough sit in but...

I suspect you sat down on it slowly. Really you should sit down hard to bounce the sled a little and where it finally sits is where you should take the measurement. There is enough friction that if you sit down slowly it will likely read 10mm or so too little.

Another thing to consider - If the spring is brand new it will relax quite a bit over the first few 100 miles.

If you installed the 6.5 kg/mm spring and you're 250 I'm sure you need the c-clip on the 2nd notch. You might not need much on the cam position (try it on the lowest notch), but in my experience you'll need 2nd c-clip position once the spring is broken in and measured in a way to overcome the friction.

I would ride it a little and then remeasure it.

 

[ReX]

One more thing...

Make sure you're wearing all of your gear. It's surprising how much it weighs.

 

[06RTXTASY]

I weight 210 and Bruce at pioneer recommended the 6.5 spring with re-valve. It is set at the 1st c-clip setting right now.I have not ridden it yet due to summer conditions but i did notice right away the skid was definitely stiffer. I may have to go to the 2 spot on the c-clip because of my riding habits. I have not had a chance to measure the sit in with the new set up. I really am not too worried with the history Bruce has with Yamaha suspension set up.

 

[ReX]

At 210 (about the same as me) I think the 1st c-clip position would work in most cases. You'll need the cam cranked up a fair bit though (something like 5 out of 7 positions once the spring settles in).

When I found I really needed the c-clip in the 2nd position was when I was doing long distance saddle bag trips. With the extra 30-40 lbs plus all the ice that builds up under the skid I found c-clip in #2 and cam in #3 or #4 was about right. I'd move the cam back down to #1 (lowest) for regular trail riding.

 

[SIMMER]

I agree ReX. I weigh about 225 without gear and I had the stiffer sping last year. I started on cam #2 and as the spring relaxed throught the year ended up at #5.

This year I had the shock rebuilt and re-valved by Bruce and moved the clip to the #2 position. When I measured the sit-in according to Bruce's instruction I still ended up at #2 cam position. With saddle bags and gear I suspect to put it back up to at least #4.

 

[REDSLED1]

the spring is stock and is at the lowest notch. it defenately feels stiffer at this position. maybe i need to put some miles on it to see where i need to be. with the c-clip on 2 and revalved shock i should get enough adj. on the spring for me.also could you guys go over the ra purpose and adjustments for us still not sure how to go about it. thanks four your advice guys. ps. the only snow around here is outside local rinks .

 

[ReX]

The RA adjuster controls the damping in the shock. It affects low speed damping the most, but does also affect high speed damping.

Basically if you want a firmer ride, crank it towards firm. If you want a softer rider, crank it towards soft.

Softer works better on smaller, high speed stutter bumps. Firmer works better on washed out moguled trailes.

Ride it, stop and turn the dial, and then ride it some more. Find out what works for you in which conditions.

 

[REDSLED1]

thanks reX. that clears things up.

 

[TT670]

The RA adjuster changes rebound dampening not compression, thats why its called an RA( Rebound Adjuster) Theres isnt a high speed and low speed rebound just rebound..Although you cant truly change just the rebound without having some effect on compression the effect it has is minimal, so when you turn the dial it will have a small effect on compression. If youre not happy with the compression characteristics of the monoshock the only correct answer is a revalve by a someone familiar with the mono.

 

[iasledder]

TT670--- I agree with what you say, but believe RA stands for Remote Adjuster. Just a guess

 

[Bodacious]

The RA adjuster changes rebound dampening not compression, thats why its called an RA( Rebound Adjuster) Theres isnt a high speed and low speed rebound just rebound..Although you cant truly change just the rebound without having some effect on compression the effect it has is minimal, so when you turn the dial it will have a small effect on compression. If youre not happy with the compression characteristics of the monoshock the only correct answer is a revalve by a someone familiar with the mono.

Then why is it when the Remote Adjuster is set to it's softest position the rear suspension is very easy to compress, and when set to the firmest position the suspension becomes very hard to compress... isn't this effecting dampening as well?

 

[craze1cars]

Here's what the Yamaha literature says when describing the Mono RA suspension in the Attak "features" section of their website:

"Like the 121-inch version, the 136 offers riders a full 20 clicks of compression adjustment on the 46mm aluminum HPG shock."

Note the use of the term "compression adjustment" in that sentence.

"And here's the description on the 121 sleds:
The Mono Shock RA rear suspension uses a single shock to control the travel of the skid. The shock is remotely adjustable via a rotating dial located conveniently on the left side of the tunnel, near the driver’s leg. The suspension is widely adjustable to suit nearly any rider in nearly any condition. In addition to the remote adjustment, the Mono Shock RA is also adjustable at the coil spring and at the control rod."

Appears that the term RA refers to "remote" adjuster based on that sentence.

I could find no mention of rebound anywhere. I acknowledge I haven't had one of these shocks apart yet to know how the shim stacks and other internals are set up to be able to offer my technical opinion on this...I'm only quoting from Yamaha's website.

 

[Soldier'spapa]

Here's what the Yamaha literature says when describing the Mono RA suspension in the Attak "features" section of their website:

"Like the 121-inch version, the 136 offers riders a full 20 clicks of compression adjustment on the 46mm aluminum HPG shock."

Note the use of the term "compression adjustment" in that sentence.

"And here's the description on the 121 sleds:
The Mono Shock RA rear suspension uses a single shock to control the travel of the skid. The shock is remotely adjustable via a rotating dial located conveniently on the left side of the tunnel, near the driver’s leg. The suspension is widely adjustable to suit nearly any rider in nearly any condition. In addition to the remote adjustment, the Mono Shock RA is also adjustable at the coil spring and at the control rod."

Appears that the term RA refers to "remote" adjuster based on that sentence.

I could find no mention of rebound anywhere. I acknowledge I haven't had one of these shocks apart yet to know how the shim stacks and other internals are set up to be able to offer my technical opinion on this...I'm only quoting from Yamaha's website.

Regarding the "RA" term. I would suspect Craze1 is correct. I have read in several posts from diferent folks on TY that they believed the RA dial adjusted rebound dampening not compression, yet right on the Yamaha web site it states the contrary (Compression)

Not trying to bust any chops... just interested in understanding these sled a little further. This site is great! Lots of folks helping out each other.

 

[snowbeast]

If your dealer has any kind of clue about the RA they wil tell you it adjusts both but at different levels each,but it borders more toward rebound,why? Only yamaha can tell us why,but when set up properly this suspension simply rocks period!! Remember we only have one shock and one spring vrs the torsion sprung twin shock counterpart,so the coil spring plays a very important part of the g-bump impact part of the suspensions mechanics,and that this skid does not have any type of tipped up rear,like poo or cat has,they did incorperate the drop link on there ck or nytro skid,but it still does not have a bent tunnel for those large g-bump landings,like my edge 600 does or my older zr 580 had,so we have to have a truck sixed coil spring for us bad big boys,who like to tear thru the junk like a snowcrosser...