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Cometa 400 / Rws 94 Stripdown And Main Springs

Discussion in 'Technical' started by Topcat2Vin, Sep 19, 2018.

  1. Topcat2Vin

    Topcat2Vin Member

    Messages:
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    Location:
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    Hi,

    I have a cometa 400 which seems to shoot quite well with 1 or 2 types of pellet. At 30 yrds I am usually inside 1" but will get the odd flyer ruining a good group. The rifle has a reasonable recoil and is a little hold sensitive so I decided to strip down and re-lube.

    On strip down the spring was pretty dry and any light oil I found was around the piston and guides.

    I also noticed at the rear of the mainspring there is a small bend.

    1. Does this mean the spring has failed?
    2. would it improve if I use a new spring? (Less hold sensitive or less recoil)
    3. I am in N.Ireland and have to have a FAC - Can the new spring go straight in or will I have more recoil, etc. if I don't cut it down. (Note we usually don't chrono test here and we are already FAC).
    Is there any other tuning I can do to get a smoother shot cycle without replacing the guides?

    I have attached a photo of a spring from the internet with a similar bend - NOTE: This not my spring and from a different gun. Spring.jpg
     
  2. JLB

    JLB Busy Member

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    Location:
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    A new spring is in order for that I'm afraid. You could try measuring the diameter of the rear guide and replace with a Titan mainspring of closer dimensions to reduce twang. Other than that a straight replacement spring & a bit of moly grease on the spring & guide.

    John :)
     
    Topcat2Vin likes this.
  3. Topcat2Vin

    Topcat2Vin Member

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    Location:
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    If the new spring is stronger - will this increase the recoil? - I would ideally like to smooth out the shot cycle a little.
     
  4. robs5230

    robs5230 Oversprung

    Messages:
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    Location:
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    The kink in the spring is likely a combination of too long a spring and the guides being too short
     
  5. JLB

    JLB Busy Member

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    There are size charts on the web for the dimensions of Titan springs, find one that will fit the rear guide best (as little slop as possible) and give you about an inch or two of preload. Is the rifle running FAC power at the minute ? If so and you want to keep it at that power level I'm afraid a strong spring is the only option without making alterations or swapping out standard parts.


    John :)
     
  6. Topcat2Vin

    Topcat2Vin Member

    Messages:
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    Location:
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    How much tuning would you typically do on a Cometa 400?

    Change spring
    Change piston seal if damaged
    Do you need to add a sleeve to the piston?
    If the guide and top hat are not tight what are the options with out getting one made?
    Lube.

    Anything else?
     
  7. JLB

    JLB Busy Member

    Messages:
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    Location:
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    All of the above, the options are endless. Loose fitting spring guide & top hat is the usual cause of twang, more so if steel which is why most buy an after market tuning kit. You have to decide how much money you want to throw at it.

    John :)
     

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