13 pro rmk 800 silber turbo studder at 7500 rpms

R

RMKVE800

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• Jan 28, 2016

• #1

I have a 13 pro rmk 800 with silber turbo external waste gate running 5 psi boost at 1500 feet with the ecu reprogrammed from silber. 50/50 race gas and when I hit 7500 rpms it stuffers and spits and like pre dets and won't rev out. Cleaned exh valves, I have silvers clutch setup in. 80gram weights. Sled ran perfect a week ago and started acting up this last weekend. Tps is at 94.7.
Can't get away from this spit and stutter issue. No broken clutch springs as well.
Anyone else have had this problem and fixed it.
I turned the boost down to 3 pounds as well and same thing
Any help would be appreciated

 

AKFULLTHROTTLE

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• Jan 28, 2016

• #2

Check your reeds and also make sure you do not have a hose clamp loose or some sort of leak but check your reeds.

 

R

RMKVE800

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• #3

Don't the reeds mostly hinder just the bottom end not running right if they are broke?

 

AKFULLTHROTTLE

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• #4

No, all of mine have affected my mid-wot on boost.

 

AKFULLTHROTTLE

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• #5

Also ,make sure your plugs are tight and caps. Also put a new set in as well.

 

T

tratch2

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• Jan 28, 2016

• #6

Mine did the same thing when i had a intake leak.... how are you getting such low boost? I cant get mine below 6/7 ....low boost actuator?

 

AKFULLTHROTTLE

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• #7

the low elevation internal is 3

 

R

RMKVE800

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• #8

If the reeds are broke anyone recommend v force or Boysen that have been stronger then stock reeds?

 

AKFULLTHROTTLE

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Vforce 3R

http://store.mototassinari.com/v3132r-873f-2.html

Or stock, IMO do not use Boyseen on boost.

 

K

kgra

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• #10

80 grams is too much weight for 5psi even at 1500ft you won't be able to pull rpm. 5psi at 1500ft you'd need closer to 75grams. 5 grams happens to be close to 700rpm as well with the equation of 1gram = 100-150rpm. Also agree with AK make sure spark plugs haven't loosned off. When im at 1500ft and 10psi with 76.5gr I pull 8400-8450rpm. At 5500ft I'm 8250-8300rpm.

 

Last edited: Jan 28, 2016

J

JJ_0909

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• Jan 29, 2016

• #11

Remember, his primary spring is "pink". On that setup, at 5psi, with my Axys I'm turning 74s at 8500 feet and hitting perfect RPMs.

Totally unrelated but I'm going to try some 70s and a lighter primary spring to see how that works soon.

 

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kgra

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• #12

Mine primary spring is pink as well but sled is 2014 pro rmk.

 

AKFULLTHROTTLE

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• Feb 8, 2016

• #13

JJ_0909 said:

Remember, his primary spring is "pink". On that setup, at 5psi, with my Axys I'm turning 74s at 8500 feet and hitting perfect RPMs.

Totally unrelated but I'm going to try some 70s and a lighter primary spring to see how that works soon.

Click to expand...

What he said, I have 83 grams at 5# and 2500 feet and she still over revs.