cold blooded


10 replies to this topic
  • bobpara

Posted April 30, 2013 - 06:26 AM

#1

I just bought an '06 WR 450 and when I start it I need to leave the choke on for a good 5 minutes or so.
If I turn the choke off before this it will stall.
The engine is pretty close to OT by the time I can turn the choke off.

Just about every other bike I have had I could turn the choke off very shortly after starting.
Leaving the choke on for a long time has the potential for fouling a plug.

Anyone else notice this with theirs?
Will any of the 'free mods' people speak of take care of this?

  • JDLowrance

Posted April 30, 2013 - 06:33 AM

#2

I just bought an '06 WR 450 and when I start it I need to leave the choke on for a good 5 minutes or so.
If I turn the choke off before this it will stall.
The engine is pretty close to OT by the time I can turn the choke off.

Just about every other bike I have had I could turn the choke off very shortly after starting.
Leaving the choke on for a long time has the potential for fouling a plug.

Anyone else notice this with theirs?
Will any of the 'free mods' people speak of take care of this?


Pilot jet is too small or patially clogged.

  • bobpara

Posted April 30, 2013 - 06:57 AM

#3

But it eventually warms up and idles fine.....if it were a pilot jet issue wouldn't it be a problem all the time warm or cold?
I also noticed a red anodized air screw with a knurled knob protruding from the bottom of the carb.
.....indicative of somebody doing some jetting work.

I 'spose only way to really know is pop carb off and do an inventory of what jets are in there.

Wouldn't a pilot jet problem show ALL the time and a choke problem would be only when its cold?
Once it warms up, it seems to idle and run fine.

  • DrFeelGood

Posted April 30, 2013 - 10:18 AM

#4

Is the AIS system removed?

If not, I recently had symptoms like this and it turned out that one of the vacuum lines had a small hole burned through it. I replaced this line and it's back to starting easily and only needs a 5 second choke warmup.

  • bobpara

Posted April 30, 2013 - 12:32 PM

#5

Interesting, I will have to look at the AIS lines.
Odd by virtue of the fact that I'd expect it to run crappy all the time if it was AIS related.....Air Induction System
An Air induction system is designed to introduce air (warm or cold engine) to lean out the mixture ....right?

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  • Krannie McKranface

Posted April 30, 2013 - 01:12 PM

#6

..or you could just increase the size of your starter jet....

  • JDLowrance

Posted April 30, 2013 - 04:29 PM

#7

A lean ciondition gets better as the motor heats up...conversely, a rich condition gets worse when engine warms up....clean your pilot.

  • DrFeelGood

Posted May 01, 2013 - 07:26 AM

#8

Does it seem to idle at high RPMs when the choke is on?

The AIS hose that gave me a lean condition was this one.


Posted Image

Attached Thumbnails

  • ais.JPG

Edited by DrFeelGood, May 01, 2013 - 07:32 AM.


  • Krannie McKranface

Posted May 02, 2013 - 07:37 PM

#9

Yes, it's supossed to idle higher when the choke is on, but not 'high'.
You need to adjust your fuel screw with the idle set very low.

  • bobpara

Posted May 03, 2013 - 07:47 AM

#10

My AIS system is GONE!
Obviously a prev owner went in there and made some changes.
I think I have to take this to the next level an pull carb out and have a look at EVERYTHING and write down all the jet sizes etc.

  • bobpara

Posted May 03, 2013 - 07:50 AM

#11

I suppose the next question is that if it is 'gone' in the right way?
Did he know what he was doing or did he just rip stuff out?
If it wasn't done right I'd have a huge air leak somewhere.....Y/N?
Would it hiss real loud or run like crap so I'd know?




 
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