Muzzgit
12-06-2009, 06:55 AM
Tacked on to the end of someone else's thread is a discussion about taking off airbox lids, filters getting wet, cutting holes, what to do?
I run the usual set up.....no airbox lid...K&N...jetted...slip on...
Recently I had a few rides on really wet tracks and have had my airfilter get completely soaked (like my socks!), to the point that the bike coughs and splutters.
I decided to cut out the rear 1/3 of the airbox lid and put it back on, so that if I do hit some water at speed it will splash up under the seat but won't splash directly on the airfilter, but still aiming for as much airflow as possible.
Last week I had the bike back to the workshop for re-jetting and dyno after run-in with new piston (406) and ported head and hotcam.
Brett at the workshop ran the dyno with both the partial lid and no lid at all and there is a difference.
Besides getting a few ponies more (now 35.4) after re-jeting, having the partial lid on did have a very slight effect on power, (down about 1 horse) and it runs a little bit rich.
The upside is running a little richer won't hurt, I probably wouldn't notice the drop in power and on winter rides I'll take that loss in place of a dry airfilter !
I run the usual set up.....no airbox lid...K&N...jetted...slip on...
Recently I had a few rides on really wet tracks and have had my airfilter get completely soaked (like my socks!), to the point that the bike coughs and splutters.
I decided to cut out the rear 1/3 of the airbox lid and put it back on, so that if I do hit some water at speed it will splash up under the seat but won't splash directly on the airfilter, but still aiming for as much airflow as possible.
Last week I had the bike back to the workshop for re-jetting and dyno after run-in with new piston (406) and ported head and hotcam.
Brett at the workshop ran the dyno with both the partial lid and no lid at all and there is a difference.
Besides getting a few ponies more (now 35.4) after re-jeting, having the partial lid on did have a very slight effect on power, (down about 1 horse) and it runs a little bit rich.
The upside is running a little richer won't hurt, I probably wouldn't notice the drop in power and on winter rides I'll take that loss in place of a dry airfilter !