VFC Scar H gearbox lockup issue.

lurkingknight · March 15th, 2013, 14:20

I don't deserve all the credit... I do believe maciek was the first to mention this possibility in another thread with another gun.

if the guide rails on the piston are too tall you could try sanding them with the paper on a flat surface... but it might just be easier to get another piston.

Varjeal · March 15th, 2013, 19:51

Thanks. I might try that sanding idea and see if it works. As soon as I find a quality piston not out of stock i'll probably order one anyways in case I screw it up.

SuperHog · March 15th, 2013, 20:01

Quote:

Originally Posted by Varjeal

Success!!...well..sorta...the piston is indeed the issue. The "rails" on the piston are simply too tall. Had to back out the screws about 3-4 full turns before the piston would drop down like the one in your vid....question is now whether to order a new piston or try modifying this one.... Anyone with a VFC Scar have a preference? I'm looking to squeak close to 400fps and a standard ROF, nothing crazy.

Sorry lurking, I misunderstood your assessment you were correct right off the bat.

Thanks guys...another lesson learned. At least this one didn't cost me, lol.

Had that same problem with a Madbull piston.

Take your piston and rub it back and forth on a 160 grit sand paper on a flat surface to reduce the height of rail. It worked for me.

Varjeal · March 16th, 2013, 00:02

I'll try that for sure...ty.

Short Round · March 16th, 2013, 13:23

I personally use a Tokyo Marui piston in mine. Assuming the L and H are the same model it should fit without any modifications other then removing the piston head form the actual piston (glued on).

It's not your typical upgrade part but it is durable and should be able to handle a reasonable fast set up if that's what you have. If you run a very high speed setup though I'd be worry about my suggestion then though. I run a 7.4 with a soon to be VFC or G&p m120 high speed motor at 400fps with a 20+ ish rps and it's been holding up fine.

Varjeal · March 17th, 2013, 00:16

Where would I find said piston in Canada?

wind_comm · March 17th, 2013, 00:54

the TM piston was excellent 10 years ago. there are plenty of other options nowadays.

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March 15th, 2013, 14:20	#16
lurkingknight "bb bukakke" KING! Trader rating Join Date: Jul 2011 Location: Ottawa	I don't deserve all the credit... I do believe maciek was the first to mention this possibility in another thread with another gun. if the guide rails on the piston are too tall you could try sanding them with the paper on a flat surface... but it might just be easier to get another piston. __________________ I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.

March 16th, 2013, 13:23	#20
Short Round Najohn Trader rating Join Date: Aug 2009 Location: SkyDome	I personally use a Tokyo Marui piston in mine. Assuming the L and H are the same model it should fit without any modifications other then removing the piston head form the actual piston (glued on). It's not your typical upgrade part but it is durable and should be able to handle a reasonable fast set up if that's what you have. If you run a very high speed setup though I'd be worry about my suggestion then though. I run a 7.4 with a soon to be VFC or G&p m120 high speed motor at 400fps with a 20+ ish rps and it's been holding up fine. __________________

March 17th, 2013, 00:54	#22
wind_comm Trader rating Join Date: Jul 2011 Location: Calgary/Vancouver	the TM piston was excellent 10 years ago. there are plenty of other options nowadays. __________________ too busy tinkering to play.

March 15th, 2013, 19:51	#17
Varjeal Banned Trader rating Join Date: May 2011 Location: Beaumont, Alberta	Thanks. I might try that sanding idea and see if it works. As soon as I find a quality piston not out of stock i'll probably order one anyways in case I screw it up.

March 16th, 2013, 00:02	#19
Varjeal Banned Trader rating Join Date: May 2011 Location: Beaumont, Alberta	I'll try that for sure...ty.

March 17th, 2013, 00:16	#21
Varjeal Banned Trader rating Join Date: May 2011 Location: Beaumont, Alberta	Where would I find said piston in Canada?

VFC Scar H gearbox lockup issue.

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