hello and welcome back as regular viewers of this channel will know i'm about to race in the
sunrise safari and with the help of my sponsors i'm turning my crf 300 rally into a rally bike
in this episode i'm installing a power up kit cbr 300 cams and intake a 550 performance ecu and a
vented air box lid this kit will soon be available from 550 performance as i'm running out of time
for my preparations i drop the bike off to coastal motorcycle centre to have them install the cams
while i work on the air box a couple of days later i got a phone call that the bike was ready to pick
up while i was down there i also bought some new michelin star cross 6 tires for the race
these tires are new but i thought i'd give him a try because my last star cross 5
worked really well i also bought a new chain and all that was left to do was load the bike up
drive home and put it all back together warning the following scenes contain chunky engineering
here you can see the difference between the two throttle bodies
the stock crf throttle body on the left and the shorter larger diameter cbr intake on the right
the issue when swapping intakes is that the air boxes are different
so you need to modify the crf air to accept the cbr intake the main issue
is making sure everything lines up and goes back together properly
i made a shonky template of the intake and made sure the cbr intake was positioned the same
you need to cut the air box hole larger and glue the new intake back in as a new intake
is a larger diameter there is a little bit of chunky engineering to get this to work
i was successful and all lined up and bolted back together with minimal fuss
the unifilter air filter is now installed it wasn't as hard as i thought to get in i
thought it was going to be a bit of a pain in the house but it went in pretty good so
i'm happy with that i'll run the pre-filter on here and maybe some other filters up here maybe
um but all in all that's good and that's what it looks like with the pre-filter on
so i've got a couple of pre-filters that will change those every day in the race
and hopefully that'll do the job here's the air box lid installed this is a new
open vented air box from maverick at 550 performance it's actually got frog skin mesh
on it so that mesh is so fine it lets air through but it won't let water through i tested that on
our queensland crf ride and it did great plenty of rain no river crossings but no water got in there
so this is what i'm going to run in the rally because i want lots of air in there new air
filter new cb 300 uh throttle body intake new cb 300 cams let's fire it up for the first time
all right i heard some fuel pumps priming uh let's see if she starts
look at that straight up
oh yeah baby
those 890s won't know what hit them now
what a difference that makes so i've got airbox opened up here a bit more air going in i've got
the uni filter filter i've got the cb 300 throttle inlet and i've got the cb 300 cams this is just
magic this is how the bike should have come the bike pulls so clean the whole way through the revs
uh before it used to rev to i don't know six seven you could feel it pulling to there and
then it would flatten off now it pulls i gotta stop at nine it was still pulling past nine
the gearing i've got on here i've changed slightly i was running
uh let me get this right 14 38 down from 1440. now i'm running 1541 there's a smidge
a little bit lower and it pulls perfect i cannot believe how good this goes now this is how the
bike should have come i understand why honda built it this way with the power down low uh easy power
smooth power downloads a lot of people getting into bikes and that's perfect for them
if you're confident with your bike if you want that more power power everywhere power up top
especially you need to do these mods um maverick from 550 performance has given me a updated ecu
tune and it is just perfect it pulls and pulls and pulls so as i said um just a quick spin
around the block testing it out it pulls so well it should have come from the factory like this
through the gears it just pulls so well fourth gear i was up to 105 kilometers an hour at about
9000 rpm i had to back off so i can't wait to get this in the safari and see what i'll do flat out
if you're considering doing these mods uh i would suggest do it they're not exactly easy especially
the air box mods getting that cb300 inlet on there is a bit of stuffing around with that
drilling it out uh epoxying it back in trying to get the angles right and then get everything back
in it's not exactly easy but well worthwhile i've opened up my air box as you can see i've got the
frog skin opening here i've got two inlets here this one another one behind there
the uni filter air filter i've just got the air filter in the pre-filtering here i'm
not running any pre-filters here i'm going to take my chances and change the pre-filter here
every day i just want it to breathe and that's what it's doing i can't get over how good it is
so i'm going to leave it there put the bike back together still do a little bit more work
power up the navigation gear get the switches working but i just wanted to give you a quick
update on the power mods with the cams the inlet open airbox it is magic i cannot
wait to get this in the race alright thanks for watching see you next time
you