Page 2 of 3

Re: need some desperate help VFR400 track bike

Posted: Thu Jun 04, 2009 10:23 am
by CMSMJ1
davvis wrote:also i live in australia,
so thanks but it might be a bit of a commute for you :)
LOL..might takea while...

There are a good few Aussies on here though - where you at? I'll guess it is beer O'clock over there too... 8-)

Re: need some desperate help VFR400 track bike

Posted: Thu Jun 04, 2009 10:24 am
by abrmoto
CMSMJ1 wrote:
Where you based? Might be able to give a hand if close by??
davvis wrote:also i live in australia,
so thanks but it might be a bit of a commute for you :)
That brightened me day up a bit.

Re: need some desperate help VFR400 track bike

Posted: Thu Jun 04, 2009 10:34 am
by davvis
as a non drinker it is never beer o clock,
but i tell you, working on and trying to suss out problems with bikes has sometimes made me want to start drinking. :)

Re: need some desperate help VFR400 track bike

Posted: Thu Jun 04, 2009 10:50 am
by abrmoto
davvis wrote:as a non drinker it is never beer o clock,
but i tell you, working on and trying to suss out problems with bikes has sometimes made me want to start drinking. :)
Yeah know that feeling all to well, not T total but very rarely actually drink. But the bikes can drive you to it some times!!

Re: need some desperate help VFR400 track bike

Posted: Thu Jun 04, 2009 11:14 am
by davvis
thanks for the help every one, i will let you know what happens when i get the resistor tomorrow,
and if it doesnt there will be some more frantic typing done on my behalf
cheers

Re: need some desperate help VFR400 track bike

Posted: Thu Jun 04, 2009 1:16 pm
by superlite
You say that it revs alright in neutral, but breaks up when under load? Are you running a standard airbox set-up (including snorkel, rubber flaps, etc.). Have you had the carbs apart and checked that they are as they should be? That's where I'd start.

Like the great movie of '08: 'Don't Mess with the Airbox'. Or was it 'Zohan' - not sure.

Where are you doing your trackday?

Re: need some desperate help VFR400 track bike

Posted: Thu Jun 04, 2009 8:10 pm
by NC35
Martin wrote:Get a 2.5k resistor and solder it between the orange/blue and green wires (clock end of the loom) like in this wiring diagram. It should solve the problem.

http://www.flickr.com/photos/37366776@N ... 3/sizes/l/" onclick="window.open(this.href);return false;
Can someone please clarify this? I always thought it was the orange/blue and black/white wires the resistor needs to go between, as per a drawing I saw here once or twice?

Re: need some desperate help VFR400 track bike

Posted: Thu Jun 04, 2009 9:06 pm
by davvis
bike has no air box, has the velocity stacks cut down
to be honest if i were to have a look at the carbies i wouldnt really know what i was looking at anyway

hopefully it is just this speedo thing, which i will be fixing today fingers crossed

track day is at eastern creek

Re: need some desperate help VFR400 track bike

Posted: Thu Jun 04, 2009 10:46 pm
by Cammo
NC35 wrote:
Martin wrote:Get a 2.5k resistor and solder it between the orange/blue and green wires (clock end of the loom) like in this wiring diagram. It should solve the problem.

http://www.flickr.com/photos/37366776@N ... 3/sizes/l/" onclick="window.open(this.href);return false;
Can someone please clarify this? I always thought it was the orange/blue and black/white wires the resistor needs to go between, as per a drawing I saw here once or twice?
The resistor needs to be bridged between the orange/blue and any 12v power on source. The black/white wire at the cdi end is one source.

Check the wires for a 12v source with a multimeter if unsure.

@ Davis: Let me know how you get on, I should be able to help you over the phone if you get really stuck.

Re: need some desperate help VFR400 track bike

Posted: Fri Jun 05, 2009 3:39 am
by davvis
ok, so i got a 2.4k ohm resistor and bridged it between the orange/blue and a green wire, i didnt check to see if it had 12v

but the dam thing still isnt running right. the cut is definately at 5500 revs, that is as clear as day now, yesterday with no bridge there seamed to be no engine breaking, now after the bridge between the orange/blue and green there is a lot more.

i will go check the voltage now
could it be anything else?
the bike runs well below 5500 and shit after, surely its cot to be this limp home mode thing?
any help