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Old 07-20-2017, 10:35 AM
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Felt from Walbro or TDRC works great. As mentioned in the other thread those fibers on that gasket are part of the gasket, pretty clear to see. Avoid the cheap hobby branded ones, get one from a known good source. Ceramic is just as good or better. Felt will actually wick up every last drop of fuel from the tank for those flights that go a little long.

Most important is to filter your fuel twice before it leaves your fuel jug. Install a felt or ceramic clunk inside the fuel jug itself and install a lawnmower in-line pleated filter just before your fuel pump on your fuel jug.

This way the only thing you tank filter is actually filtering out is any contaminates that may possibly make way into the system through the fueling process or incoming through the vent line.
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Old 07-20-2017, 11:46 AM
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And the vent line...
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Old 07-20-2017, 11:52 AM
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Just swapped out felt filters this week on a 50cc and 60cc setup. The filters that were replaced were genuine Walbro part 125-527-1. My reason for replacing these is that 125-527-1 is capacity rated at 30cc or less. The new installed filters are genuine Walbro 125-528-1, rated at 80cc. These specs are from Walbro's site, but you have to do some searching to locate them.
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Old 07-20-2017, 12:00 PM
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I wonder if you will be able to see a difference.
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Old 07-20-2017, 12:07 PM
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If you choose to use the ceramic filter with a transparent Fiji water bottle or similar tank, periodically inspect the tank for scratches and wear-thru. The weighted ceramic clunk is abrasive and over time, with fuel as a lubricant, the bottom edge of the ceramic can wear through the thin plastic tank. These tanks are not as thick or wear resistant as the old Dubro poly tanks.

The metal clips on a Walbro clunk can similarly scratch and wear through the tank.

I have been gradually switching over to Zama filters. Zama makes carbs so I presume they know what they are doing on their filters. I have not seen any stray fibers on mine. Note: They aren't quite as heavy as a Walbro or ceramic clunk so you need to be using a soft, flexible Viton pickup line. Tygon might get too rigid too quickly. You can find the Zama online easily. Zama filters have a black nylon exterior cage around the felt filter and metal weight disc so it's a soft plastic rubbing on the thin plastic tank.
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Old 07-20-2017, 01:22 PM
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United States, NC, Oxford
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Quote:
Originally Posted by BarracudaHockey View Post
I wonder if you will be able to see a difference.
In peace of mind, definitely! There is physical size difference. The 528 is about 1/4 - 1/3 larger and has a larger diameter fuel outlet also.


The 528 has a nylon(?) bumper on the outside edge of the felt end. This may provide some tank side protection.
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Last edited by notruthless; 07-20-2017 at 01:29 PM.
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Old 07-16-2018, 08:20 PM
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I am now convinced, at least with a 200 cc motor, the felt clunk and the ceramic clunks act as restrictors to fuel flow.

Experiment coming soon. Stay tuned.
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Old 07-16-2018, 08:40 PM
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For those that don’t know.... 3W sells a LARGE felt pickup that works very well with 200cc engines. I’ve used these from 2011 on the DA200 and have never had issues.

http://www.aircraftinternational.com...8/Default.aspx
Changing the pickups every 2 years works.
Wayne
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Old 07-16-2018, 09:02 PM
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I've been running dual V2 Fortitude tanks with their stock felt clunk for two seasons now on my 200 and I haven't had a single hiccup. Not sure how it could work any better.
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Old 07-28-2018, 02:24 PM
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UPDATE:
Just flew her without the felt clunks.

I have removed the felt clunks and retuned the motor, and now I am getting 7300 rpm in the air.

When I was flying her with the felt clunks, max rpm in the air was 6900

No hiccups using the Dubro large clunks.

I have telemetry data to prove it.
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Old 07-28-2018, 04:27 PM
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Quote:
Originally Posted by orthobird View Post
UPDATE:
Just flew her without the felt clunks.

I have removed the felt clunks and retuned the motor, and now I am getting 7300 rpm in the air.

When I was flying her with the felt clunks, max rpm in the air was 6900

No hiccups using the Dubro large clunks.

I have telemetry data to prove it.
ortho......are you saying you could not get an "Over/Rich" adjustment setting, using the felt clunks?......
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Old 07-28-2018, 07:49 PM
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I should clarify, the needles were more open with the felt clunks.

What I did today was put the needles to factory settings .

So next time I go fly, I will lean them in some and see what happens.
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Old 07-28-2018, 08:07 PM
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Quote:
Originally Posted by orthobird View Post
I should clarify, the needles were more open with the felt clunks.

What I did today was put the needles to factory settings .

So next time I go fly, I will lean them in some and see what happens.
That is quite interesting. I just put in a felt clunk in my AJ123 tank. It is a DA170 so maybe it won't be as affected as your 200. But if I need to tune more than normal, that may be the first thing I look at.
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Old 07-28-2018, 08:25 PM
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I fly 12 months a year
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Just the large felt clunk without the kit from Aircraft International
http://www.aircraftinternational.com...8/Default.aspx
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Old 07-28-2018, 11:54 PM
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so its told to me by the local hardware store that stocks alot of small engine parts, that Walbro replaced the felt clunk with a new style. I bought one and installed it but didn't take a pic.
It no longer uses felt, but a tighter material.

The reason for the redesigned walbro clunk minus the felt was that felt material was winding up inside carbs.
I doubt they did away with their felt clunks, but the sure came out with a new style.

I'll see about taking a pic tomorrow and posting it.
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