Air Filter Foam in standard filter frame?

[M.V.]

Well, you're all about to find out how cheap I am!

I have ordered some parts for the TRX, including a new airfilter, & I plan to gut the old one, remove the paper filter & put some filter foam in there. I'll put the frame back together with bolts.

I reckon it should free up a bit of airflow, which shouldn't be a problem, & will become washable, rather than throw away.

Can anyone foresee any problems with this?

[cobbadiggabuddyblooo]

prob by the time you purchase the other filter and then the filter foam to mod the old one you could just go out and buy a K & N filter and have a washable filter for the same price anyways.. I made my own filter too modelled on the RAMAIR twinsock filter to fit over the stacks on my FCR's and it's working fine after bout 5,000km's and 6mths so far ( 20mm thick filter foam)

[cobbadiggabuddyblooo]

I might add you will also notice a difference with the K & N filter down low they breathe a lot better.. First mod I made when I first purchased my TRX all them yrs ago.. good investment...

[M.V.]

Fair enough, I thought it might be worth a try if the foam was cheap enough, better than throwing the old filter out!

[M.V.]

Ok, so I did this, I have been running it for a month or so, in the next few day, I will swap over to the original & see what the differences are, stay tuned!

[Mincehead]

If you search the threads MV you`ll find members who`ve gone to great trouble modifying standard airbox`s I believe Phuk was one such.
Kedo even market round push in`extra` filter elements for folk who go down this route,cutting holes in the front of the airbox housing.
Gains CAN be found but the better/less time consuming option is to junk the airbox altogether using K&N or Ramair filters. Best of all though get some big ole squirters for her(Keihin FCR41`s),you`ll be amazed at the extra ponies you`ll find you`re riding.

[Kayla]

Best of all though get some big ole squirters for her(Keihin FCR41`s),you`ll be amazed at the extra ponies you`ll find you`re riding.

This is v. true, even with a standard-ish airbox still fitted and if you do the TPS mod you'll find one or two more, allegedly.

[phuk72]

If you search the threads MV you`ll find members who`ve gone to great trouble modifying standard airbox`s I believe Phuk was one such.
Kedo even market round push in`extra` filter elements for folk who go down this route,cutting holes in the front of the airbox housing.
Gains CAN be found but the better/less time consuming option is to junk the airbox altogether using K&N or Ramair filters. Best of all though get some big ole squirters for her(Keihin FCR41`s),you`ll be amazed at the extra ponies you`ll find you`re riding.

Yep - I spent time and money trying to sort out the standard airbox / carbs. Gains are negligable.

[dandywarhol]

Because Yamaha (and the other major players) spend millions of yen/euro/dollars to get a reasonable compromise between airflow and passing noise tests - then Joe Amateur comes along with a piece of memory foam and thinks they can do better - very, very occasionally Joe Amateur gets it right but more ofter gets it wrong......................do you really want to feck your cylinder bores/pistons and have even more oil burning issues?

[M.V.]

It was more a cost thing, rather than performance per se, $25 for enough air filter foam to make 4 x reusuable filters, vs $50 each for disposable Yamaha filters. Performance wise, as long as they weren't any worse, I would be happy.

do you really want to feck your cylinder bores/pistons and have even more oil burning issues?

You're meaning more air = less filtering, more crap in the engine, or is there more to it?

[dandywarhol]

Thats what I mean MV - when you consider the engine is gulping in roughly 30,000 litres of air for every litre of fuel - that's a helluva lot of crap to potentially suck in.........

[M.V.]

I thought it would be more along the lines of 14.7 litres air/per litre of fuel...

Anyway, I'll take out the filter this weekend & see how dirty is is, then swap the original in & see what the differences are.

[dandywarhol]

14.7 to 1 by MASS, 30,000 :1 by volume...............next time you hear the induction roar on full throttle do you think you're putting in fuel at 14.7 times ratio?

[M.V.]

Ah, I see! The induction roar is very hard to hear over my Leo Vince slip ons