08 KTM 530 Jetting – Page 2 – OLD Bull Trailriders

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April 12, 2010 at 2:01 am #175746

Anonymous

white rocket wrote:

Quote:

when its wet moto you just put the standard sidecover on (not one cut up by grinder) bit more hardcore out here ride in the rain the tracks are like rivers also use a raincoat filter skin from the hardparts catolog the ktm airboxs are not very waterproof.ps i thought you were an engineer -more air plus more fuel=more power

Rocket – Did you bother reading my post before getting your panties all twisted? I didn’t say it doesn’t improve performance, in fact I said I have done it to both of my bikes and a mates bike too.

You said yourself that the KTM airboxes are crap and let water in anyway, so what’s a bit of rain?

More air does equal more power, but only when you have more fuel. If you increase the air flow and don’t increase fuel flow when the bike is properly jetted you will run lean and cause the bike to pop like the above bike has experienced. If you are running slightly richer jetting (more than sufficient fuel flow) and open the airbox the bike will run quicker because you are adding more air but have additional capacity in the fuel flow to keep up with it.

So, in the case of the original post where the bike was running lean, they have now added enough extra fuel (with jetting and air screw mods) to almost stop the popping, at this stage without further jetting mods adding extra airflow by whatever means will make the bike pop again.

April 12, 2010 at 2:24 am #175747

Greg
Member

white rocket wrote:

Quote:

i thought you were an engineer -more air plus more fuel=more power

Ha ha Rocket your on fire, its a question we all ask ourselves :laugh:

As far as the running lean thing goes how does it run leaner? It still draws air? It drew air before. It still draws air only cleaner air as it doesnt come from the back wheel area just through the side cover.
We never touched Dan’s jetting when we did his, mine was ok (I was chasing a dead spot) Kiwi’s when I did his on his DR etc etc its just clean air people

Unless its getting a ram air affect which with the XR it isn’t and I doubt on the KTM’s either.

And Yes Rocket I use a different side cover on real wet rides

TB

April 12, 2010 at 2:48 am #175755

Anonymous

It’s a bigger area to let more air in. The fact it’s cleaner has little/nothing to do with it (obviously to a point). Kato’s draw air in from above as well so nowhere near the wheel. The point of the filter is to make the air clean so the carbie is only ever getting clean air.

You don’t necessarily have to touch the jetting when you do such a mod, it will be bike specific dependent on the standard/current jetting. I indicated this in my post above.

April 12, 2010 at 2:54 am #175764

Dean
Member

I had standard pipe on my 04 WR450 when I did the airbox mod Ie open up the pre-marked holes and fitted a better pipe I had to rejet richer

Ollie

April 12, 2010 at 9:16 am #175765

Mike Wyeth
Member

Stevo its tom using dads profile, mate tell you what i played with the suspension and set it back to whats standard in the manual for my weight and that. Also i lifted the front forks up about 10mm in the mounts and also added that ignition curve switch. Tell you what mate took it out for a big ride at amamoor yesterday and it feels like a totally different bike aye, its the first time ive actually enjoyed riding it. The power it has is awesome, it was the suspension and not having any confidence in the front end that was just tiring me, it always felt like i was just fighting it rather than riding it. Im going to keep it now, as far as this popping goes we’ve got the 45 pilot in it now and its made it a bit better but its still doing it a bit. I turned the fuel screw out 2 turns and it refused to start out in the middle of the forest yesterday, so ive turned the fuel screw back in to 1.5 turns now and it starts and runs great but its still pops on no throttle just above idle revs. Not sure if you can get rid of it completly i guess maybe dropping the needle again my affect that rev range. It seems to be a ktm thing though from people i know up here with katos.

April 13, 2010 at 12:19 am #175808

Anonymous

A bit of pooping on decel will be fine, I would leave it like that unless it really irritates you. If it does you can try the needle down a clip to richen it up.

Which way did you move the forks? You should have put them down through the triple clamps (top of the fork flush with top of triple clamp) to make it more stable at speed. Going the other way will increase turning and flickability but make it more prone to instability at higher speeds due to the steeper head angle.

Glad the suspension mods worked out for you, I know how a few clicks or few mm ride height at each end can really mess the feel of the bike up

April 13, 2010 at 2:39 am #175252

Steve Walsh
Member

Hi to all,
I have just joined OBT and am pleased to find out that all other 530 owners are having my problems.
Love the bike but hate being the one that everybody waits for because it won’t start when hot!
Have J.D jetting kit etc etc.Someone told me that the exhaust valve should be set to 4thou.as opposed to
5-6 thou. as recommended.Has any one tried this and does it work?Bike starts easy when cold with no choke
does this mean it is to rich.Appreciate any feedback

April 13, 2010 at 3:16 am #175253

Greg
Member

Walshy Hi and welcome.

I have just spoken with Scott at Sutto’s the KTM dealer that is a site sponsor he is going out the workshop to get some info on how they set them up (the 530 race bikes that is) Mal at Sutto’s has just put his brand new 530 together and tried some interesting jetting so they will post some info up shortly.

How about an intro as well mate

TB

April 13, 2010 at 3:24 am #175894

Steve Walsh
Member

Cheers TB
Would welcome any info. Appreciate the help
Walshy

April 13, 2010 at 3:35 am #175254

Scott Tyszkiewicz
Member

Hi guys what you need is

Standard needle (OBDZT)
clip should be on the 5th position from the top
40 pilot jet
180 main
air screw should be 1 1/2 turns out

If you find it still pops maybe try a 45 pilot

Hope that helps

Cheers
Scott

April 13, 2010 at 3:36 am #175899

Bruce Curtis
Member

re; holes in airbox covers, this has been done since BSA bantams were the preferred scrambler, it’s just clean fresh air and as long as you don’t go wild with the holesaw it has little to no effect in the rain, yes mud and water it does and that’s why on a lot of old photos you see 100mph tape stuck to RMs and YZs side covers.

It’s a good free mod and requires no other changes.

And Moto, I’m a bit worried that you have a bike that “POOPED” on deceleration, sounds a bike suss to me…..then again I’d probably poop too if you came towards me with an angle grinder.. :woohoo:

BC

April 13, 2010 at 3:47 am #175902

Greg
Member

TISCO wrote:

Quote:

Hi guys what you need is

Standard needle (OBDZT)
clip should be on the 5th position from the top
40 pilot jet
180 main
air screw should be 1 1/2 turns out

If you find it still pops maybe try a 45 pilot

Hope that helps

Cheers
Scott

Cheers Scott, and thanks Sutto’s workshop :laugh:

TB

April 13, 2010 at 4:18 am #175903

Anonymous

Nothing wrong with a bit of pooping Bruce :laugh:

At least you all have a bench mark to go now that Scott has provided, gotta love the interweb!

April 14, 2010 at 10:27 am #175904

Mike Wyeth
Member

Thanks for all the help guys, the bikes finally running good now and the poppings pretty well stopped. In the end we put the needle on the 5th clip from the top, left the main jet at 180, changed the pilot jet to a 45 and put the fuel screw out 1.5 turns and that seemed to fix it pretty well.

April 14, 2010 at 10:35 am #176052

Greg
Member

mike wrote:

Quote:

Thanks for all the help guys, the bikes finally running good now and the poppings pretty well stopped. In the end we put the needle on the 5th clip from the top, left the main jet at 180, changed the pilot jet to a 45 and put the fuel screw out 1.5 turns and that seemed to fix it pretty well.

TISCO wrote:

Quote:

Hi guys what you need is

Standard needle (OBDZT)
clip should be on the 5th position from the top
40 pilot jet
180 main
air screw should be 1 1/2 turns out

If you find it still pops maybe try a 45 pilot

Hope that helps

Cheers
Scott

Thats great Mike, thanks to TISCO (Scotty) at Sutto’s he certainly took all the guess work out of it. Happens I guess when someone who knows what they are talking or has done it about gets involved cheers again guys

TB
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