chemomche

Hi, when i bought my bike the seller told the it has BMC filter. A couple of days ago i opened the air box to do the TPS mod and i found this


I think it is a BMC filter from another bike that is fitted on the original filter plastic plate.
My question is - does BMC filter haw the plastic part that stops the air or i should cut it out(as some people do on a OEM filters)?
Plus, do i need some rejetting for the current set up - i got open cans and fuel pump....and as i know i don`t have jet kit installed.
I am thinkig of shimm mod + lond front air funney ....will this be enough fot the BMC filter and the cans?
I can`t put it on a Dyno so it will be hard to tune the carbs perfectly.

Stephan

No, BMC doesn´t have this plastic ridge. You don´t need dyno to tune the carbs perfectly, just feel how it goes.

chemomche

i see it is quite the same as mine, except the ridge

i do not haw much time to ride, so no time for thest rides and tuning also
if i go without the ridge(or as it is now) should i just go up with the mains/pilots or have to get a jet kit

rz_racer_69

Are you currently having a problem with you bike running? If not, I would say leave well enough alone unless you are trying to eek out a couple more HP. These bikes are known for being finiky with non-OEM filters, and the OEM filters flow more than enough air. Read the many threads on the site about that before you start hacking a working setup.

Stevebis1

Ha- that's not a BMC, that's an OEM modified with a Fram reusable filter. I'm not sure if I saw it on this forum or one of the others but at one point people were experimenting with cutting out the papefnelement on an poem and glueing in a Fram reusable element.
One key point was that the plastic dam could be left in place. Haven't seen this in a while think it was early 2000s this was being discussed

chemomche

i have no problems runining, may be just sametimes a flat spot at about 3k
however, i got the bike this way so i cannot tell if it run better ot less than the original set up

P.S. of cource i want some extra hp

chemomche

more likely to be BMC from onother model - you see the red plastic cutout around the filter, it is not just the filter element pun on the OEM plastic

rz_racer_69

You might try an OEM filter then. There have been cases where going back to stock filter fixed all or mist of the running problems.