Huben Any issues or problems with Huben gk1 please share your experience

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DonEnzone said:
Yeah the one inside the kit I ordered has the long darkgrey spring in it. I have an early GK1 V1. My original spring looks different than the two in your picture. It's about the same length as the bottom one, but with less windings, thicker wire, and bronze colored instead of darkgrey.

So the long spring doesn't work well for you? What happens exactly when you install it? Air dump? Underpowered shots? Or no shots at all?
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The first v3+ upgrade kit i got had a striker with a small hole and no plug. Longer spring of coarse. This combo was not consistent.
Weird spikes in velocity. Sticking valve slowly draining all the air, etc. when i checked the spring is was deformed slightly.
I had ordered a v3+ kit from Airgun technical after learning Huben was using the brass valve again. I did not expect the original striker with the black plug.
I installed this kit as is and noticed a puff of smoke and burning smell. Smelled like when you crack loose a loc tited bolt. After a couple shots i saw the smoke was coming from the rear cover. Then noticed my scope pic rail which screws to that cover loosened up. When i took it apart the spring was deformed, and the rear cover had a visible bulge. The spring and/or spring insert was ramming up against the cover. I was only running it at 20-25 fpe.
I determined the cavity in the striker where the spring seats measured.250
I then measured the striker on the first v3+ kit and it was .420.
Thought maybe Huben was using the original striker without considering the longer spring.

My 3 GK1’s have the same parts including the middle spring in the picture (K1) and I haven’t had a issue since.

IMG_7705.jpeg
 
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steve-l said:
These springs fail only at maximum power settings. I have a V1 in .25 set at 710 fps with a 25.4 gr pellet. It has shot about 12,000 rounds without any issues.
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Theres a reason Huben has max power numbers of 40/30 fpe .. not sure .177.
My 25 is at 38 fpe with no issues.

Theres no stop for the striker when fired. You can shoot it out the back without the cover on. You have the rubber donut there but other than that the striker will fully compress the spring and violently at high power.

Hubens running that longer spring without addressing the striker cavity spring depth.
I have 3 of those longer springs in the picture.. all deformed at low power settings.
The original spring is too firm imo.
Middle spring in picture is slightly softer and is the best spring to run in the GK1.
 
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Kenjeepman said:
V3-+ long spring 1.500
Fully collapsed.750

W/ .250 striker depth = 1.010 spring when installed.

At high power it wont take much to bind that softer spring. Installed length to full bind = .250
Fwiw the first iteration v3+ striker i got from
Wolfiek was deeper at .420 vs .250
Even with the installed length at 1.180 it still deformed the spring.

View attachment 592011
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How do I order spring # 2 from Wolftiek? What is the correct part #?
 
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steve-l said:
How do I order spring # 2 from Wolftiek? What is the correct part #?
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I had asked them how to get the v3+ spring because the spare part diagram list the original 7x31 spring. Was told to request it in the order notes. I am not sure the size or how to go about asking for it in the notes. Best bet is to just order part #9 from the K1. last i checked is out of stock.
New England Airgun Has some still I believe.
 
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