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Old 04-30-2013, 04:08 PM   #1 (permalink)
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pump stroke question

So I want to acquire a smooth pump stroke...
I have the BASIC vendetta pump kit which I would like to swap to the legit vendetta sometime. Would this REALLY improve the smoothness of the stroke or not so much?
To me, it seems like the pump stroke hits its peak of torq (or difficulty) when the bolt hits the hammer to put tension on the main spring. If I swapped the main spring out to a softer one will this play a huge roll on the performance? I know the pump stroke will be easier but I'm sure this will change the velocity right?
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Old 04-30-2013, 04:24 PM   #2 (permalink)
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If I swapped the main spring out to a softer one will this play a huge roll on the performance? I know the pump stroke will be easier but I'm sure this will change the velocity right?
Correct. A softer/weaker spring will lower your velocity.
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Old 04-30-2013, 05:33 PM   #3 (permalink)
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So you would want a lighter valve spring to go with it. Otherwise you'll end up screwing the IVG in so far that it negates the benefit of having a lighter main spring.
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Old 04-30-2013, 06:23 PM   #4 (permalink)
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so whats the whole point of a good pump kit? that only makes the stroke smooth until it hits the hammer??
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Old 04-30-2013, 06:39 PM   #5 (permalink)
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Smooth is not that same as soft. I good pump kit is smooth throughout the pump stroke whether it is pushing the hammer back over a strong spring, weak spring or returning the pump handle to the forward position. I good kit will be smooth and not bind or twist.

If you want a smooth and soft stroke, then as others have said you need to replace the main spring and valve spring.
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Old 04-30-2013, 11:44 PM   #6 (permalink)
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if you want, you can run CCM valve and hammer springs with stock WGP internals for a lighter pump stroke. the SLPS (super light pump stroke) spring set maggot in the dealers forum is selling look like a good alternative too. i personally am running the CCM springs in my pumps with WGP or Check it internals.
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Old 05-01-2013, 01:38 AM   #7 (permalink)
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awesome thanks for the advice
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Old 05-02-2013, 08:21 PM   #8 (permalink)
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Get a kit of the SLPS from Maggot (http://www.mcarterbrown.com/forums/d...ring-kits.html)
I got a set the other day threw them in a pump a buddy has(mine is not done yet) and the results were amazing his pump has a horrid pump stroke and with these springs in it the thing was 100% better, for the price you can't beat Maggot's springs.
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Old 05-03-2013, 01:03 PM   #9 (permalink)
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Does that kit only come with 1 valve and 1 main ? Would it just be better to get the madman springs?
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Old 05-03-2013, 02:00 PM   #10 (permalink)
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Does that kit only come with 1 valve and 1 main ? Would it just be better to get the madman springs?
If you need the ability to tune beyond what can be achieved with the IVG and reg, you'll need the extra springs; but, the SLPS springs are paired to achieve a specific function. If your reg and IVG (don't see why this wouldn't be the case) allow you to achieve your desired velocity with the SLPS springs, you'll have a light pump stroke; lighter (by others' accounts) than is possible with the Madmann's lightest springs. We'll see. I've been using CCM's springs, which only come as 1 of each also, and it is pretty darn light on the pump stroke; even with the pump arm return spring. I'll try to comment more when the SLPS springs get here.
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