wet box

P_J · Nearly there... Joined: 24 Nov 2002 Karma :

Ok, i took out the air filter the other day, and washed in water. Not the best move, i know that now. Thats back in (but still not oiled).

Took out the air box today to delve a little deeper and discovered that there is 2stroke (the red) oil around the rim going into the carb. Why is this?

I thought 2stroke was to help the engine and was mixed/pumped into there and nothing to do with the carb. (probably wrong)

Also i discovered, where my illusive fluid leak was coming from. There is a hose clip connecting the airbox to the carb, and a hose clip dangling around, not connected to, the pipe from the carb to the engine. Oil / fuel / 2stroke seems to be pissing out of there all the way down the outside of the 'overflow' pipes by the side stand.

What is the fluid most likely to be and why would this not have been picked up on, on its 1st service?

On starting the bike now, and leaving it to warm for a min or so, i can rev the engine and it seems to either starve itself or flood itself and stalls. If i rev it slowly the revs will climb, if i do it fast, it dies.

At the moment my bike it sat outside looking sorry for itself and i don't know how to make it better.

Also (sh!t this is a long post), the manual for idle adjusting says to go at it from the inspection hatch on the right hand side, the pic on this topic though suggests that you go in from the other side.

The two screws to adjust, does one of them have a spring round it and the other is about half its size, or do you go at it from the left, in which case there are two small screws on that side too.
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P_J · Nearly there... Joined: 24 Nov 2002 Karma :

In addition to my dissertation above, the air box is now back on and secured properly.

Im just after the correct way to adjust the idle and would like your thoughts on why my NSR keeps dying when rev'd.

Going to be no use if i cant accelerate Sad

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Lee · Trackday Trickster Joined: 02 Jul 2003 Karma :

If I were you, i'd take the airbox off and start the bike (with the fuel tank hinged back so you can see down towards the carb) and try to see where this liquid is coming from. Maybe you have a split pipe somewhere, or one not properly connected....

Evilbob · Crazy Courier Joined: 26 Nov 2002 Karma :

some oil does came back out the carb for some reason happens alot on ktm's. and some times isnt even the same colour at the 2 smoke mix as it goes in apparently?"!?!?! (asked some one else about this be4)
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cagiva gezzer · World Chat Champion Joined: 17 Mar 2003 Karma :

I read your post a few times.

2t Oil- pumped into the engine by a pump in/mounted on the engine. Usually comes out of a pipe and goes to the inlet manifold or the side of the carb.

At a guess here your bike has a dell orto "PHBH 28 ??". If so, the oil infeed will be on the front right (as you sit on the bike) side of the carb. The oil enters here and lubes the engine. Check that the tube connects to the carb and the oil pump. If not, your bike WILL seize.

When you say "the pipe from the carb to the engine", do you mean the above mentioned tube, or the manifold???

The oil at the inlet of the carb is normal. Its hard to imangine because it happens so fast, but the gas flow through the carb isnt always in the same direction. Pulses of air and therfore fuel and oil will come out the back of the carb. Nothing to worry about.

If the julbilee clips arnt done up tight, the oil will leak out and it will cause carbuartion problems. It will run lean.

The idle adustment on a PHBH is usually on the RH side (it can be the other side) Its the larger one of the two (the smaller one is the idle circuit adjuster) just below and infront of the fuel infeed. Screw it in to raise the slide and increase the idle.

NSRs cant accelerate anyway! Wink

Dying while trying to accelerate is either too much or too little fuel. More likely too little. Too much will make loads of white smoke and it will splutter.

Too little will be caused by a blockage some where.
Check fuel is flowing through the fuel tap and fuel tube by dis-conecting it from the carb and watching it come through.
Check the inline filter if it has one.
Check the filter just inside the carb where the filter enters.
Remove the bowl of the carb and check you have the right jets and they arent blocked.
Check for water in the bottom of the bowl.
Check the float moves freely.
Check that the various adjusters are set correctly.
Check the filter inside your tank.

If all of then above seem normal, check the plug and exhaust.

Umm, might of forgotten something.

Hope the above helps.
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"because one stroke isnt enough and four strokes waste two"

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

P_J · Nearly there... Joined: 24 Nov 2002 Karma :

cagiva gezzer · World Chat Champion Joined: 17 Mar 2003 Karma :

The idle circuit adjuster adjust the idle circuit. Supprisingly.

There are different circuits in the carb (routes fuel can take). The idle , choke and "main."

If the bike doesnt start well without the choke or doesnt run well at low revs, the idle circuit needs to be richened or leaned off.

The choke circuit is closed all the time, apart from when you open the choke.

The main circuit (prob has a proper name) is controlled by how much you open the throttle and various jets.

Inline filters - most bikes have a filter in the tank and dell orto carbs have a filter built in them, so a inline filter isnt needed, but some people fit them.
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"because one stroke isnt enough and four strokes waste two"