jetting

cwalkin

Joined Jan 2006

75 Posts | 0+

australia

Discussion Starter
• Mar 13, 2006

• #1

hey guys,,

just a question about my 05 450e,
the bike runs great but on de-acceleration the bike pops from the exhaust .
it also seems to have alot of engine heat , is this normal as its my first BERG?
Or is it an indication of lean jetting.?
its running stock as follows ,
main jet -178
jet needle -obdvr
needle position-6 th from top
mixture control screw-2.0

anyone got any suggestions on what jetting specs i should run?

altitude is about 200m(656ft) and 400m(1312ft) above sea level.
AUSTRALIA

THANKS

 

whosahberg

Joined Dec 2005

1K Posts | 0+

australia

• Mar 14, 2006

• #2

they do pop when you back off , but only slightly .

i would recommend you inspect the exhaust connections , and use a quality sealant . paying attention to the mid pipe to muffler join .

 

LINEAWEAVER

Joined Jul 2001

3K Posts | 1+

El Sobrante, Ca. 94803

• Mar 14, 2006

• #3

Free agent shameless plug:
Gallery link

[email protected]

Dale

 

Taffy

Joined Nov 2001

17K Posts | 774+

Ely, England

• Mar 14, 2006

• #4

you can try an E series needle. the code is in the doc. i get my needles from yamaha. the codes are all over TT in their YZ or WR sections.

the infoormation is on a huge jetting thread in 'fuel' as well.

regards

Taffy

 

S

supertireguy

Joined Jun 2005

456 Posts | 3+

San Francisco, CA

• Mar 14, 2006

• #5

A little bit of exhaust popping on decel is normal. Exhaust leaks can contribute to this issue.

What pilot jet number are you running?

Spark plug color light grey or dark?

Any dyno shops nearby where you can do a dyno run and get the graphs showing your air/fuel, torque and hp numbers? Those charts can be very helpful.

 

cwalkin

Joined Jan 2006

75 Posts | 0+

australia

Discussion Starter
• Mar 14, 2006

• #6

the pilot jet is a #40

and the spark plug is light whittish

 

whosahberg

Joined Dec 2005

1K Posts | 0+

australia

• Mar 15, 2006

• #7

you don't get a true plug colour with the kokusan ignition .

 

B

BOSS

Joined Feb 2005

779 Posts | 0+

Portland, OR 97216

• Mar 15, 2006

• #8

cwalkin you might try a little larger pilot,

with a 45 pilot two turns out on fuel screw

i do not have any popping 04,05,06 fe450.

let us know!

 

S

supertireguy

Joined Jun 2005

456 Posts | 3+

San Francisco, CA

• Mar 15, 2006

• #9

cwalkin said:

the pilot jet is a #40

and the spark plug is light whittish

Click to expand...

Sounds maybe a tad lean. Like BOSS said try going up to a 42 or 45 pilot jet.

 

Taffy

Joined Nov 2001

17K Posts | 774+

Ely, England

• Mar 15, 2006

• #10

you shouldn't go by the plug colour and you shouldn't go by the backfire noise.

want to get rid of it? just adjust the PS underneath the carb.

regards

Taffy

 

S

steve

Joined May 2002

2K Posts | 141+

Snowy Mountains NSW Australia

• Mar 15, 2006

• #11

Taffy and Dale are the experts.

This works for me, see link, set up a few years ago with major input from Taffy and works great. 1-2 kick starting when hot, perfect linear response and no stalling or popping/backfiring and 100+km per tank.

Gallery Link

Steve

 

LINEAWEAVER

Joined Jul 2001

3K Posts | 1+

El Sobrante, Ca. 94803

• Mar 15, 2006

• #12

Hi Steve,
Thank you for the kind words.

FYI:
The FCR MX carburetors of late use a different style pilot fuel fuel jet then that of the initial FCR.

FCR = N24-21

FCR MX = N24-25

Your picture includes an N24-21 style pilot fuel jet.

Sincerely,
Dale

 

cwalkin

Joined Jan 2006

75 Posts | 0+

australia

Discussion Starter
• Mar 15, 2006

• #13

thanks for the input guys,,,
ive put a #42 pilot jet in it and it still pops but not as much and the bike seems to run a bit cooler?
i havnt adusted fuel screw at all and forgot to see what they set it up at,
should i try adjusting the fuel screw first before going up a jet?
can i adjust the fuel screw while bike is running with stock screw?

 

B

BOSS

Joined Feb 2005

779 Posts | 0+

Portland, OR 97216

• Mar 15, 2006

• #14

cwalkin,

yes you can adjust fuel screw with very short screw driver,

but try 45 pilot & then adjust you will like!

please tell us how things work.