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Old 09-27-2020, 12:43 PM   #1
Young Gun
 
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Tanaka M700

Hey everyone, so I'm thinking about rebuilding my son's M700 for him, he bought it second-hand and it shoots like crap. I'm gonna order a chrono today to get some numbers, but it's obvious it has issues. Can someone point me to a tear-down post, or video? All help and suggestions are appreciated, thanx in advance.
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Old 09-28-2020, 03:28 PM   #2
 
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What is it doing exactly?
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Old 09-28-2020, 04:37 PM   #3
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Most likely worn down rubbers (gaskets en bucking). G&G and Falcon are the only ones that makes spare parts for those afaik.

You're in the right track by disassembling it for diagnostics though

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Old 09-28-2020, 06:01 PM   #4
 
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Action Army also makes a few. King Arms also has a few bits as well.

You probably only really need a replacement spring and rubber bits. Both available from G&G. You may also need new valve knockers depending on how much it was used and what magazines you use.
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Old 09-29-2020, 09:18 PM   #5
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Quote:
Originally Posted by Plazmaburn View Post
What is it doing exactly?
It's very inconsistent, but I ordered the rubber kit last night from Evike. Gonna start with there, I'll try to post pix later
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Old 09-29-2020, 09:22 PM   #6
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Quote:
Originally Posted by Dimitri MdP View Post
Most likely worn down rubbers (gaskets en bucking). G&G and Falcon are the only ones that makes spare parts for those afaik.


You're in the right track by disassembling it for diagnostics though

I ordered the G&G rubber set last night from Evike, thanks for the vid, gonna study it now
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Old 09-29-2020, 09:32 PM   #7
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Originally Posted by Plazmaburn View Post
Action Army also makes a few. King Arms also has a few bits as well.

You probably only really need a replacement spring and rubber bits. Both available from G&G. You may also need new valve knockers depending on how much it was used and what magazines you use.
Hey which spring do I need to replace? It has 3 short mags, gonna order the long mag soon. Are the valve knockers on the mag? Thanx for your help
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Old 09-30-2020, 07:48 AM   #8
 
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How inconsistent is it?

There are 2. one in the bolt, the other is in the magazine under the gas route.

The valve knocker is in the trigger, the valve pin and rocker are in the magazine.

Not super surprising about the inconsistent fps being all over the place, being unregulated green gas and all. If your after much better shot consistency, then HPA tapping a long magazine is your best option. If that is what you mean by inconsistent.
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