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Old 08-23-2010, 10:09 PM   #1 (permalink)
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Exclamation need help!! 450 wont start!!

i recently bought a 2009 kfx 450r the gas tank has been bone dry for a while now. iv,e filled the tank with gas and checked the gas line, the problem is the fuel wont get past the injector into the carb, ab=nybody know what i should do? all advise appreaciated,
thanks, Brian
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Old 08-24-2010, 02:09 AM   #2 (permalink)
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So have you took the injector out and cranked it over with the injector wires hooked up to see if it sprays?

Is the fuel pump making it's priming noise?

If no fuel and no noise...
Find the little orange plastic fuse holders under the hood. (2)
The one for the fuel pump & injector has a white wire, and a white/black wire.
Open it and a 10 amp fuse will be inside.
Pull it and check it.

If bad, replace...
If good, replace and move back to the fuel pump relay.
It will have these color wires...
White/Black ... White/Red ... Yellow/Red ... Black/Red
Unhook it and swap it for the Fan relay, which has blue wires going in

Try again... if it works, swap back and try again... and if it does not work, bad relay.

Swap for one of the starter relays with a brown wire going it until you can get a replacement.
This will allow you to start up one way but not the other...
Either only in neutral or only with the clutch pulled... (pick your pony)


If none of this helps, and you have no prime and no injector mist, unhook relay again.
With switches on, check inside on the plug terminal for power between...
Yellow/Red and frame
White/Black and frame
Both should have power

If yes on prime noise and no injector spray...

Clean injector and try again.
No dice, check injector circuit.

First do audible inspection to see if it's clicking
Next unhook it's wire...

Hook meter to injector terminals to check resistance.
Meter (+) to
Meter (-) to

Hook meter to incoming wire plug to check for voltage.
Meter (+) to White/Red wire terminal
Meter (-) to battery negative

Meter (+) to Blue/Red wire terminal
Meter (-) to battery negative

Turn switches on... reading should be battery voltage for 3 seconds, then 0
(both tests)
__________________
'00 TRX400EX
A project in progress...
...brought to a screeching halt (3/09)
Time for a new 450R!

'08 Monster Energy KFX450R (Black)
Jardine RT99 Exhaust
Procom ECU (fully programmable)
Holeshot GNCC's
ProArmor Tether & Install Kit
ProArmor PowerGRIP System
ProArmor Dominator Bumper
ProArmor full skid protection


'99 Sport 400
Out of a time capsule...
Bone stock, new condition (6/08)
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Old 08-25-2010, 09:59 PM   #3 (permalink)
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we have it narrowd down to the fule pump, the injector, or the electrical.
we took the fuel pump off and couldnt get air through it, even with a compressor, the electrical going to the injector is only showing 3 volts, how much pressure should it take to get fuel through the injector? because the pump seems a little weak.
thanks a lot, Brian
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Old 08-26-2010, 02:06 AM   #4 (permalink)
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You haven't narrowed it down to anything... not from your description anyways...

Can you hear the fuel pump priming up when you turn the switches on?

Does your injector spray when you remove it from the throttle body and crank the engine over?

Have you unhooked the fuel line from the injector and shot some carb cleaner through it to see if it is clogged?

And while that was off have you checked to see if the fuel pump is supplying fuel to that point?


What is your battery voltage?
And are you sure you are checking properly at the injector?
It should be battery voltage for 3 seconds, then 0v.

What about the fuel pump... what is being supplied to it?
It should have the same supply... battery voltage for 3 seconds, then 0v.

If both just have 3v continuous instead of battery voltage, then 0v... check your grounds.


I want to hope it just has a clogged up injector that can be cleaned out.
But you have to check things and communicate findings if you could use help figuring things out.
So lets go over the simple stuff first and not be pulling fuel pumps and trying compressed air, etc...

* Let's visually and audibly check for what is operating and what is not
* Let's see if it's getting what it needs to work if it is not working
* Then let's see why it's not working if it has what it needs to work
__________________
'00 TRX400EX
A project in progress...
...brought to a screeching halt (3/09)
Time for a new 450R!

'08 Monster Energy KFX450R (Black)
Jardine RT99 Exhaust
Procom ECU (fully programmable)
Holeshot GNCC's
ProArmor Tether & Install Kit
ProArmor PowerGRIP System
ProArmor Dominator Bumper
ProArmor full skid protection


'99 Sport 400
Out of a time capsule...
Bone stock, new condition (6/08)
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Old 08-26-2010, 11:51 PM   #5 (permalink)
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Yes we can hear the fuel pump priming up, no we havent pulled the injector and cranked the motor over,(but will try it tomarrow), we have cleaned the injector. The fuel pump is supplying fuel up to the injector but the presure seem a little weak. Havent checked the voltage to the fuel pump( will try tomarrow) thanks for the info.
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Old 08-27-2010, 03:24 AM   #6 (permalink)
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Without looking it up, I think the fuel pressure is 43 PSI... but I should really look it up.

The fuel pump could be going or the filter could be clogged.
But let's take it a step at a time and see what we figure out.
__________________
'00 TRX400EX
A project in progress...
...brought to a screeching halt (3/09)
Time for a new 450R!

'08 Monster Energy KFX450R (Black)
Jardine RT99 Exhaust
Procom ECU (fully programmable)
Holeshot GNCC's
ProArmor Tether & Install Kit
ProArmor PowerGRIP System
ProArmor Dominator Bumper
ProArmor full skid protection


'99 Sport 400
Out of a time capsule...
Bone stock, new condition (6/08)
Duster is offline   Reply With Quote
Old 11-07-2010, 05:17 PM   #7 (permalink)
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I just went through all of this. Grab a manual and read through all the diagnosis procedures. It's time consuming but will help you understand how it all works together.
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