Author Topic: Air Jet Question? (Read 7990 times)

NintyOne · « **on:** May 21, 2006, 01:50:38 PM »

While trying to remove Idle Air Jets, two got messed up. One is out but the screw driver slot is a little chewed up. On the other one, the screw driver slot is mostly gone but it's still stuck in there.

My questions are:

1) How sensitive is the idle air flow to the entry shape of the jet? The whole point of this exercise is to achieve perfect idle balance. The bore that meters the air flow is in the second half of the jet. But, how significant is the entry shape?

2) Should I just clean up the mangled end with a drill bit and be done with it?

3) Or, should I take out the jet with "Easy Out" and replace it?

4) If #3, does anyone have spare jets that you would be willing to part with? The jet is #1.55

TIA

Herr Tod · « **Reply #1 on:** May 21, 2006, 03:38:45 PM »

I can imagine the shape is very important. A jet is numbered to the amount it flows. For example, you can have two #100 jets, but one has a 1.00 mm hole and the other has 1.15 mm, but they both flow the same amount of liquid / air per hour.

I would replace them with good ones.

BrianM · « **Reply #2 on:** May 21, 2006, 03:42:03 PM »

For the Fuel jets, they do have a 'shape' that makes a difference....

I have no clue on the air jets, but I would certainly replace them (could be a Lot of hair-pulling going on to diagnose running problems caused by leaving them in).

I had the exact same situation with the pilot jets (fuel)... had to pull 1 with an EZ-Out, replaced them all (they were all buggered).

Thief400 · « **Reply #3 on:** May 21, 2006, 05:30:19 PM »

How the hell did they get so screwed up in the first place????

BrianM · « **Reply #4 on:** May 21, 2006, 07:17:06 PM »

Quote from: Thief400

How the hell did they get so screwed up in the first place????

You need to ask? Gorilla previous owners (or the tool clueless, sometimes a combination of both).

The people who have no business working on a bike, working on a bike (trust me, this includes LOTS of dealer shop monkeys).

Take your pick

NintyOne · « **Reply #5 on:** May 21, 2006, 09:10:44 PM »

I have the factory shop manual, which specifies using thread locking compound in a lot of places. I think that is what they did at the factory. A lot of screw type assemblies are very difficult to break for the first time. In case of jets, the fact that they are made of brittle brass alloy doesn't help the situation.

In any case, since the overall consensus is to replace the damaged jets, does anyone have spares?

TIA

interfuse · « **Reply #6 on:** May 22, 2006, 01:38:25 AM »

It's better to buy new jets. Jets are cheap. Bike bandit should have all the parts you require. The sizes are listed on the sides of the jets you've removed (and in the shop manual). Match them up to the pictures and you're good to go.

Bike Bandit Mikuni Link

Thief400 · « **Reply #7 on:** May 22, 2006, 09:58:48 AM »

I can tell you for a fact that the air screws are not locktited into place at the factory!

NintyOne · « **Reply #8 on:** May 22, 2006, 01:51:45 PM »

Theif400,
Air screws are spring loaded and adjustable; therefore, of course they wouldn't be locktited in place.
However, I believe you are confusing them with air jets, which is the subject of this topic. If an air jet unscrews itself loose, due to vibration, it can easily end up inside the combustion chamber with severe consequences.

Thief400 · « **Reply #9 on:** May 22, 2006, 03:41:09 PM »

Quote from: NintyOne

Theif400,
Air screws are spring loaded and adjustable; therefore, of course they wouldn't be locktited in place.
However, I believe you are confusing them with air jets, which is the subject of this topic. If an air jet unscrews itself loose, due to vibration, it can easily end up inside the combustion chamber with severe consequences.

Ok Rob I'm going to let him have it LMAO
The Air Jets are not Locked into place by anything other than Galvantic corrosion. And should never never never be taken out for any reason. I dought there is anyone on this site including me who has the knowlege to start messing around with the air jet sizing. Even if your cleaning the carbs there is nothing gained by trying to remove them other than screwing then up! Being a none wearing item in the carb I don't think Suzuki would even stock them, They may have given it a part number but that doen't mean it's a stocking item.

NintyOne · « **Reply #10 on:** May 22, 2006, 04:18:58 PM »

OK hotshot, dance around the issue all you want. I have no further response for this foolishness.

Thief400 · « **Reply #11 on:** May 22, 2006, 04:56:25 PM »

Quote from: NintyOne

OK hotshot, dance around the issue all you want. I have no further response for this foolishness.

Dance I might but I'm not the Idiot that tried to take them out

interfuse · « **Reply #12 on:** May 22, 2006, 10:01:31 PM »

Don't waste your time & money ordering Mikuni jets from Suzuki. Find a Mikuni dealer that stocks the parts. On Bike Bandit don't order jets from the OEM carb diagram. Click > search parts by manufacter > mikuni > street and save yourself a bundle. Example, pilot jets from the OEM carb diagram are listed at $4.99 a peice, from the Mikuni section they're $13.49 for a pack of 4. Exact same part but without the markup.

I've never ordered from Bike Bandit, but my local dealer stocks the complete range of Mikuni jets so I don't see why Bike Bandit wouldn't.

Good luck, with a little patience and perseverance you'll have the carb as good as new in no time.

Thief400 · « **Reply #13 on:** May 22, 2006, 11:40:27 PM »

They wont have those jets as they are 1. not a wearing item 2. not a tuning item. Best bet would be to find a set of used carbs on ebay and take it easy with the screw driver next time

Herr Tod · « **Reply #14 on:** May 23, 2006, 02:18:14 PM »

Quote from: Thief400

2. not a tuning item.

I disagree with that. It is in fact a very important part, and you can do a lot of tuning with it. In fact, I think it should be replaced by a different sized jet if you use a jet kit that changes the emulsion tube.