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bobpara

cold blooded

11 posts in this topic

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?

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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.

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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.

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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.

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

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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.

index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=62422

ais.JPG

Edited by DrFeelGood

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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.

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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.

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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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