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November 6th, 2015, 08:35 AM   #21
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Did a bit of fiddling today and sorted the throttle cable, tomorrow the head will come off for porting it to fit the new TB. A lot of material has to come out going from the current 42mm to 46, 2mm all around the circumference! Got new blades for it, frrr

Last edited by TomTom; November 15th, 2015 at 03:39 AM.
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November 10th, 2015, 08:00 AM   #22
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I had a bit of a problem with the KTM intake rubber not fitting the 570 head, turns out I got the wrong intake rubber, new order for the good one from KTM 950 -05, marked 60036044000 INTAKE BOOT 03. Ill make a complete list of bits and bobs with part numbers later in the final post when conversion is done.

Seems all parts are covered now(lol!) and I can get down to grinding the head beginning of next week.

Edit: KTM part no 60036044000 confirmed to do the job.

Last edited by TomTom; November 12th, 2015 at 08:19 AM.
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November 12th, 2015, 08:13 AM   #23
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A pic of current vs replacement, its a bit bigger and a lot longer arrangement no doubt.
Dont get me wrong here, it isnt better the bigger it is, just right is what you want.
Getting it to fit the bike will be...lets say interesting but doable

Diameters;
OEM TB is 44mm on top and tapers down to 42 before the butterfly and then stays at 42.
New TB is 50 on top down to just below the butterfly where it tapers down to 46 and stays 46.

Lengths;
The intake port from the flange to the valve is around 90mm.
OEM TB is 80mm, plus the rubber 'stack' of 20mm -> total length around 190mm.
New TB is 100mm, plus a 55mm stack -> total length 245mm.

190mm will from experience give a smoothed out delivery but torque will be traded for it. Cam duration is fairly short so maybe with the new TB it wont get too wavy but better tq. Just guessing here, time will tell.

Thanks from bushmechanic and jon andersson

Last edited by TomTom; November 13th, 2015 at 12:00 AM.
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November 12th, 2015, 08:36 AM   #24
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it would be really interesting if you installed the doma first and tried and then installed that throttle body. But I understand if you wont do it.
I have always been curious of that TB since I read maKe's thread but as I already have a 44 I guess I will stick to it. And as you say bigger isn't always better.
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November 12th, 2015, 09:00 AM   #25
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I can do it the other way around. Im going to fit the TB first, but I can do that as an isolated event still.
Infact I have three setups to try if Im feeling ambitious, form of the day will dictate
Im quite soft for the all three option if enough people are interested in me doing so, just inspire the old goat to do so

-TB with OEM exhaust, oem ecu and bazzaz FI unit (What I had, just TB differing)
-TB with OEM exhaust and FP ecu (having access to ignition advance)
-TB Doma exhaust and FP ecu
Thanks from bushmechanic and jon andersson

Last edited by TomTom; November 12th, 2015 at 09:07 AM.
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November 12th, 2015, 09:03 AM   #26
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That would be so good!
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November 12th, 2015, 09:05 AM   #27
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Also dyno sheet bike with stock tb VS fp tb would be Interesting.
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November 12th, 2015, 09:23 AM   #28
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A stock bike with slipon I can get on the dyno, have a race buddy from the ice that asked, we were quite even on the ice before I modded my bike, should be a valid reference for a stocker.
All else will be with my bike, ported head and the FP piston, that is.
Meaning we will never know what a bigger TB does to a stock bike, but I dont think its too interesting as its too much work, do the high comp and porting first Id say.

Obvious first mod is the seat mod.

Last edited by TomTom; November 12th, 2015 at 09:27 AM.
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November 12th, 2015, 01:48 PM   #29
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You are so lucky to have your own dyno... I would love to have one as there are so many questions I have that can only be answered empirically. I been thinking of building my own but it's such a big project for me with my limited knowledge.
So anything extra you do TomTom is very much appreciated!
Thanks from TomTom
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November 13th, 2015, 07:47 AM   #30
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Managed to sort the head today, not much left of the flange but enough.
Unstrapped the electricals and then its not an issue making the TB fit the bike, may have to trim the stack a tad as its close to the frame LH plus the rubber boot needs a few mm's. Also bought the 450 boot just incase its better suited for the job, with the oem TB its situated far left while with the new one its much more centered, we'll see.

Now just an awful lot of cleaning ahead...sigh...and then some dyno fiddling.
Thanks from bushmechanic

Last edited by TomTom; November 13th, 2015 at 07:53 AM.
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