Foam Filters

When I bought my Batavus 1976 VA from a friend, it was missing the plastic carb cover and the air filter, and it went so much faster with out them but when I bought the carb cover and filter, it goes i would say 10mph slower, Brian Lamborn [miniengine@yahoo.com] told me I should get my carb fitted with a uni-foam filter, any body have any other suggestions or agree with him, and do you know where I can get this filter. Thanks a lot Nick

Re: Foam Filters

Listen! If Brian said that,IT's GOSPEL,and you ain't gonna go wrong listening to him,because he's not stubborn.I saw that when Ron Brown was helping him with a battery installation schematic.BYE!

Re: Foam Filters

Go to a motorcycle store that sells dirt bikes and buy a foam filter that comes close to matching your carb. Take a pair of sissors and trim it so that it fits over your intake, make sure it has some kind of support frame in it so that it won't get sucked into the engine. Hold it in place with a plastic tie-wrap ( zip-tie ).

Re: Foam Filters

Ron Brown /

Nick,

Make sure you do a plug chop to check your mixture at "high" speed. The lack of restriction could lean you out too much.

Ron

Re: Foam Filters

Miniengine /

I bought a UNI foam filter that fit over the carburetor and went with it. No cutting, no fitting and no worrying about it getting sucked into the carburetor. There are two Bats running around the area that don't have any filter on them at all and they've been doing that for the last couple of years. I cringed as I wrote that because I don't want to endorse running without a filter. That's why I went with the UNI filter because I think you get the best of both worlds. Filtered air with such a large surface area that you don't have the restriction of the stock filter.

I haven't seen any ill effect for running the Bats without the air filter restriction, but then again you should use some common sense. I don't ride for miles on end with the throttle wide open and I believe that helps in saving an engine. I think that's a good idea for any moped.

The Bi-turbo experiment is coming to an end and although I didn't get the 5 MPH gain that seems to be common, I did receive a 3 MPH gain. This was only achieved when I cut the head pipe to where I could just fit the Bi-turbo muffler into place and not compromise the pedal chain and tensioner. I made an adaper to move the pedal out and once I get a mounting bracket made I feel the Bi-turbo will be a permanent fixture. I'll post some pictures on the web site of the final installation soon.

Brian

Lamborn's Miniature Engines

http://www.geocities.com/miniengine

Re: Foam Filters

Miniengine /

Nick,

I realize you sent me a personal email for information on the UNI filter, but I'll post the information on the forum in case others are interested. On the Batavus moped I'm using a UP-4200 Pod Filter. It has a 2" ID X 4" height. The Encarwi carburetor is about 2 1/8" on the outside and this filter will stretch over the outside of the carburetor opening for a nice tight fit. It's a little long, but it will squeeze between the frame and the carb. You can see a picture of what this filter looks like installed at my web site: http://www.geocites.com/miniengine . Just look under 'Moped Adventures' and in the HOW TO section look under the Encarwi carburetor page.

When buying these filters don't forget to buy the oil used to soak the filter. I realize UNI is trying to sell it's filter, but on the UNI web site they have information on why these filters are better then the stock setup. The UNI web site is: http://www.unifilter.com and the catalog page with the price listing of the filter I used is: http://www.unifilter.com/clamp-on.htm

scan down to the second section of this page named Uni "POD" FILTER "URETHANE END"

and you will find the UP-4200. The list the price as $13.95, but I got mine at the local motorcycle shop for $11.95. I'd seriously check your local motorcycle shops and see whether they carry UNI filters and if they will order you in this filter if they don't have it in stock.

I hope this helps,

Brian

Lamborn's Miniature Engines

http://www.geocities.com/miniengine

Re: Foam Filters

Miniengine, would you recommend doing a plug chop when I put the UNI filter on?

Re: Foam Filters

Brian should I in your opinion do a plug chop when I get my UNI-filter?

Re: Foam Filters

Ron Brown /

Boy, am I ever interested in the answer to this one : )

Re: Foam Filters

Miniengine /

Sure, try a plug chop now before you get the UNI filter installed and tell us what the results are. Since the UNI filter won't restrict your air flow it will be about the same as running without a filter at all.

Brian

Lamborn's Miniature Engines

http://www.geocities.com/miniengine

Re: Foam Filters

Miniengine /

Ron,

How do you teach someone to read spark plugs without any colored diagrams?

Brian

Lamborn's Miniature Engines

http://www.geocities.com/miniengine

Re: Foam Filters

This site tells what spark plug colors are bad and good in Freds Guide to fix your moped. I will post the results when I get the front wheel on friday so I can actually use the thing lol.

Re: Foam Filters

Miniengine /

Good deal Nick, and good luck.

Re: Foam Filters

Yes, whenever you do any modification of the intake or exhaust system of a two stroke you should check your plug for excessive lean ( the more damaging of the two ), or excessively rich running conditions. This also applies to four stroke engines, but since they have an internal lubrication system, lean operating conditions are not quite as damaging as on a two stroke. This is one of the reasons why four strokes get better gas milage.

Re: Foam Filters

Don't! Don't use foam filters, get yourself a universal K&N filter or some other paper filter. They filter better and allow a lot more air to pass through.

K&N

Miniengine /

Ivo could you tell me what K&N filter fits between the frame and the carb. on my 76 Batavus VA? I looked at the K&N line but couldn't find any close fits for the moped. As for paper filters, K&N denounces them as being worse so they can sell their own filters. K&N wouldn't be happy with you lumping them in the same basket as a common paper filter because that's what they are competing against. Even the foam filters claim to be better then paper filters. Who can you trust in this day and age?

Brian

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