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-   -   Need clutching help....Silber Pro rmk spiking rpm at throttle stab (https://www.snowest.com/forum/showthread.php?t=424124)

Spiderman 01-12-2017 08:31 PM

Need clutching help....Silber Pro rmk spiking rpm at throttle stab
 
It causes it to hit the limiter and cut out just on the on off stab of the throttle. If I am slower with the stab, its fine. 2014 pro rmk 163 with silber external, stock gearing, 7lb spring 9-10000 foot elevation, 91 pump with a splash of av. I have 72 gram rooster weights with the weight spread 5grams in the heal 2 in the middle 42-46 helix, pink primary spring and black green secondary spring that came with the kit Runs great otherwise with the latest flash. I cant add an more weight to the heal without going to the those heavy 3.5g washers Corey had me check my belt which is good. Running 8200 rpm. Clutches dont have any noticable belt marks on them. Was thinking of trying the black purple secondary spring or a steeper intial helix angle. Anybody have any other ideas to try?

ripnit 01-12-2017 11:02 PM

Just a thought but a belt can get "glazed" and look fine but may slip in the primary. Also check primary spring is not broken (have seen the first coil of the spring brake and make clutch act weird.)

Spiderman 01-12-2017 11:10 PM

Yeah I checked that... Has done it from the start and switched to a new broke in belt and had the same thing. Sheave to belt clearance is good too.

wellfed777 01-12-2017 11:38 PM

so you can be riding along and full throttle and it over revs ?
or from a dead stop ? or both?

Spiderman 01-13-2017 12:54 AM

From both a dead stop and if going along playing in the trees... hard off and on throttle hits. It misses and pops. Nothing at full throtte and nothing after the initial stab of the throttle after letting off. Ive recorded it over revving... so the belt has to be slipping or the motor isnt being loaded enough at those times?

LongHorn XC 01-13-2017 07:49 AM

Quote:

Originally Posted by Spiderman (Post 4030377)
It causes it to hit the limiter and cut out just on the on off stab of the throttle. If I am slower with the stab, its fine. 2014 pro rmk 163 with silber external, stock gearing, 7lb spring 9-10000 foot elevation, 91 pump with a splash of av. I have 72 gram rooster weights with the weight spread 5grams in the heal 2 in the middle 42-46 helix, pink primary spring and black green secondary spring that came with the kit Runs great otherwise with the latest flash. I cant add an more weight to the heal without going to the those heavy 3.5g washers Corey had me check my belt which is good. Running 8200 rpm. Clutches dont have any noticable belt marks on them. Was thinking of trying the black purple secondary spring or a steeper intial helix angle. Anybody have any other ideas to try?

When you say a splash of AV fuel, how much is that?

Spiderman 01-13-2017 09:25 AM

3 gal per tank

AKFULLTHROTTLE 01-13-2017 09:44 AM

Need to move more weight out on the tip.

Spiderman 01-13-2017 11:03 AM

Even if I'm not hitting the limiter holding it at full throttle? I was hitting a max of 8200 at full throttle like 8150 running full throttle. Forgot to mention, it did the same thing with 3.5 grams in every hole to make it 75.5 grams at 9-10000 feet but my rpms were too low with that much weight. Still acted the same on the throttle stab.

JJ_0909 01-13-2017 11:21 AM

You sure your clutches are clean and functioning properly? It sounds like one of two things. Clutches are binding somewhere (not shifting out) or your belt is slipping.

Spiderman 01-13-2017 11:33 AM

Clutches look good, cant find anything binding. They worked great before the turbo install, so I dont think its the clutches. Running the stock 115 belt. I think I need more pressure on the belt. I dont think its holding the power at the stab. As soon as it builds a little boost on the stab it over revs. Thanks for the input. Keep it coming...

wellfed777 01-13-2017 11:51 AM

Yeah try loading the weight more evenly
Then you can stay near the weight you already have
If you pack tools that's something you can test on the hill

Spiderman 01-13-2017 12:10 PM

Yeah, that was my initial setup weighted evenly at 75.5, 3 red screws, grams which was too heavy and under revving at full throttle

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AKFULLTHROTTLE 01-13-2017 12:17 PM

I would personally run the orange spring and then you may be able to run the same weight but evenly or tip heavy.

Spaarky 01-13-2017 12:20 PM

The Polaris orange spring????

AKFULLTHROTTLE 01-13-2017 12:23 PM

Quote:

Originally Posted by Spaarky (Post 4030615)
The Polaris orange spring????

Venom/Team I guess the Almond/Red would be the same.

165/310

hontri 01-13-2017 01:23 PM

I have the same sled as you. Silber external waste gate and reflash. I was supplied the same clutch components as you except i got SSI weights. I am at 6-7 thousand feet. 50/50 av to 91. 76.5 grams of weight slightly center heavy. I did not like the pink spring. Went to polaris almond red. Black green in secondary 42/46 helix 20 thou sheave clearance and running the deflection a little tighter. Also running the Gates carbon belt. Engagement 4000 to 4100 rpm. 2:41 gearing. Running very well. Pulls hard.That being said i am about to try TRS's setup. Waiting on parts.:face-icon-small-hap

Spiderman 01-13-2017 01:45 PM

So did u ever have that over rev problem? What was the pink spring doing for u? That spring will make me upshift quicker?

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AKFULLTHROTTLE 01-13-2017 02:22 PM

Lower engagement and slightly less finish rate that may make your even weighted set up work good.

Spiderman 01-13-2017 05:37 PM

K, i will try that too...

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Spiderman 01-14-2017 07:02 PM

Mines doing the same as this https://www.youtube.com/watch?v=yMC2...ature=youtu.be

wellfed777 01-14-2017 07:55 PM

that's not hitting the rev limiter that's a stutter or bog
i remember that guy posting but can't remember what he figured out
not sure what year kit that is

Spiderman 01-15-2017 10:47 AM

I've recorded mine go above that 8600 and make the same sound. The rev limiter sounds different than this? Mine sounds like this only on the intial stab of the throttle from stand still or from hard on off stabs.

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diamonddave 01-15-2017 11:47 AM

Quote:

Originally Posted by Spiderman (Post 4031115)




That was forum member Diehardpoo 2014 kit running low altitude in Alaska. It was a special 2863 set up not the 2860 sold to the masses. I purchased that kit from him and it's been a perfect dialed set-up since install.

It's hard to tell from that video if it's a lean (or possibly a rich misfire) or rev limiter.

At the time of install, I made some minor clutching changes, exhaust valve spring change, intake mods, and BR9EYA plugs gapped to 0.015" and it's running 8 lbs on the gauge at 7,000 ft.

It runs perfect down to 2,200 ft as well.

We're not sure if that vid was taken with the original 2014 Silber reflash or the mid year updated reflash. Because when I got the kit, the stock map was loaded. This was/is a special hacked ECU which allows the end user to change maps.

I have a lot of goodies left to install now on the motor that have me curious.

Spiderman 01-15-2017 12:36 PM

This is before the goat 6 flash. There is a vid also after the goat 6 flash where it difinitely runs better, but still does it. My ecu was flashed in like december of 15 so that should be the most recent flash? I found the post where others had the same problem and this vid is in it. //www.snowest.com/forum/showthr...silber+problem I checked my exhaust donuts today and they are are leaking some, engine was cold, so I will have to make a boost leak tester and cover the donuts with that high temp silicone and retest. Diehard said he never got it figured out and sold it.


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