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Message started by IslandRoad on 02/21/17 at 13:11:13

Title: Air box: parts question
Post by IslandRoad on 02/21/17 at 13:11:13

Hey guys, I discovered last night that my air box has a part missing. I think a previous owner must have ditched it. It's part #10 on the attached diagram.

I can't find any photos online that show the inside of the part so I don't know if it regulates the airflow to the air box. I also can't find anywhere that sells the part by itself.

Does this part have much effect on the airflow to the carb?
Does it affect the vacuum condition or tuning of the carb?
Anyone know where I can get one?

Thanks

Title: Re: Air box: parts question
Post by Dave on 02/21/17 at 13:22:50

That's weird....Suzuki shows it on the parts diagram and numbers it, then doesn't provide a way for you to buy it.

The part is there to help reduce the sound that can come out of the air box when you have the throttle open.....and it may also help to direct water away from the paper element.

I am sure there are plenty of us on this forum that will have an old air box laying around....and we can send you the part. I will look and see what I have at home.

Dave

Title: Re: Air box: parts question
Post by justin_o_guy2 on 02/21/17 at 13:35:21

I think that disappeared the first time I saw it.
Never missed it.

Title: Re: Air box: parts question
Post by IslandRoad on 02/21/17 at 13:35:54

That's great. Thanks Dave :)

Title: Re: Air box: parts question
Post by IslandRoad on 02/21/17 at 13:37:37

Thanks JOG, I'll probably replace it anyway, but good to know it doesn't change the airflow significantly :)

4F756A67686254696762060 wrote:

That's great. Thanks Dave :)

Title: Re: Air box: parts question
Post by justin_o_guy2 on 02/21/17 at 13:50:23

The real answer is
The longer and harder you beat on it, the more parts you get.

Title: Re: Air box: parts question
Post by IslandRoad on 02/21/17 at 14:20:31

Do two halves make a 'hole' ?

Title: Re: Air box: parts question
Post by verslagen1 on 02/21/17 at 14:29:22

It does increase the backpressure when installed.
Putting it back will make the a/f mixture richer.

And yes I have a couple lying on the floor.

Title: Re: Air box: parts question
Post by IslandRoad on 02/21/17 at 14:41:46

Ah, I suspected it might do something like that.

My carb tuning has just not quite been going how it seems it should, based off what I've read on the forum. I'm a newbie so I don't yet know what I don't know.

I've been going richer, to a point, it still doesn't feel quite right, but I decided to leave the tuning and check out other possible sources of air that might be affecting the mix. I was starting to think I was just being too pedantic.

However, I found I had a faulty petcock, so the Raptor helped things along a lot, and I reckon this might just tighten things up that little bit more.

I would really appreciate it if you could send me one. I'll PM you so you can let me know how much, and how to get the payment to you.

Cheers :)

43504746595452505B04350 wrote:

It does increase the backpressure when installed.
Putting it back will make the a/f mixture richer.

And yes I have a couple lying on the floor.

Title: Re: Air box: parts question
Post by Dave on 02/22/17 at 03:18:46

I had to go pick up a new motorcycle last night......so I didn't have time to root through the pile. I am pretty sure I got one somewhere.

And our jetting advice might also need a bit of adjustment for your use in Australia.....the fuel that they sell you may be completely different than what we use in the US. Most of our fuel has 10% ethanol blended in, and that requires jets that are just a little bit larger than it would for pure gasoline.

Title: Re: Air box: parts question
Post by IslandRoad on 02/22/17 at 11:18:26

Thanks Dave, funny you should mention the fuel. I was just looking into the fuel differences. The guy who sells Mikuni carbs here in Australia also mentioned it when I was inquiring about jets. I'm gonna hold off on any more tuning until I get the snorkel onto the airbox ,then I'll go through the jetting again a step at a time [ch9786].

Don't stress about finding the part, Verslagen1 told me he has a couple of them handy and offered to send me one [ch9786]

Title: Re: Air box: parts question
Post by IslandRoad on 02/24/17 at 02:19:08

Dave, I was talking to a good friend of mine yesterday about fuel differences between the States and Australia. He's a small engine mechanic (power tools and bikes) with 30 years experience - including dealing with imported products from the USA.

He told me that the fuel here is different from the States in that our fuel tends to be "fatter". That is, "there's more in there that burns" as well as more complex (larger) molecules.

Anyway, the point he was making is that the effect is actually counter-intuitive. He has found, with imported small engines from the States, that they tend to arrive here set too lean for our fuel (we don't really have emission control laws here for power tools so these are stock from the supplier) - and they can run very hot. He speculates that our fuel generates a slower burn, and possibly is more viscous (slowing the flow through the jets).

Whatever the reason behind it, he finds he has to tune engines from the States the same way he would to make an engine run richer, to compensate for the difference in the fuel.

At the end of the day, I'll be tuning for my specific engine, but I found the conversation fascinating - and relevant to this discussion :)

0A313C2B3A362D2B3038352A590 wrote: