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Old 06-18-2013, 01:35 AM   #16
tHEtREV
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Quote:
Originally Posted by Rapid Dog View Post
The PO move the ECU to under the seat. Some sort of mod I don't understand. I mounted back where it belongs on the steering head.
Questions to come...
The ECU was moved to the airbox to give it more steering lock on left turns.

Make sure you adjust the steering stops so that the forks won't hit the ECU if you are planning on keeping it in the original location.
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Old 06-18-2013, 06:10 AM   #17
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Originally Posted by Rapid Dog View Post
yaeh baby! Now that's some relative info!
Thanks for that.



Who is he. How does one contact him, eh?
http://www.djhcyclesport.com/

He's very active on KTMtalk, one of the engine gurus there. You might want to join up there for everything technical and also for a really nice discount at Munn Racing if you get a lifetime membership.



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Old 06-18-2013, 07:42 AM   #18
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Originally Posted by GR0NK View Post
http://www.djhcyclesport.com/

He's very active on KTMtalk, one of the engine gurus there. You might want to join up there for everything technical and also for a really nice discount at Munn Racing if you get a lifetime membership.



Sean
Yeah I'm on that. Just ordered some stuff from Munn yeterday, best prices I could find on anything.
I'll look into the motor dude.
Gracias...

You know, I did the Athena 290 on my WR250X and it really made the bike alot more vibey. I'm reticent to do a big bore kit on this one.
I'd like to hear from someone who did this...
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Old 06-18-2013, 07:43 AM   #19
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Quote:
Originally Posted by tHEtREV View Post
The ECU was moved to the airbox to give it more steering lock on left turns.

Make sure you adjust the steering stops so that the forks won't hit the ECU if you are planning on keeping it in the original location.
aha! Thanks, I will check that out when I get her off the lift...(mental note to self...)
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Old 06-18-2013, 08:49 AM   #20
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Originally Posted by Rapid Dog View Post
You know, I did the Athena 290 on my WR250X and it really made the bike alot more vibey. I'm reticent to do a big bore kit on this one.
I'd like to hear from someone who did this...
My buddy did it and it really woke the motor up mid to top. The beauty of the 400 is the docile bottom, it gets traction out of the hole, and you don't want to mess that up. The 453 mod builds better mid and a really good top end without sacrificing the awesome bottom. My Dave Hopkins built 540 was a 60hp mini monster that would go 185 km/h on pavement, but on gravel my 540 and my buddy's 453 were side by side at just under 160 km/h, with the excess power just being turned into roost. I'm 6'2", 225lbs so my 540 didn't beat me up too much but at 5'8" 175lbs, my buddy's 453 was an easier and smoother bike for him to handle and it made him a faster rider. Most people will try the bigger motors and like the boost, but then they go too big and find that the excess is just too much and they come back to the combo that worked the best. IMO if you start with a 450 or 525 that best bang combo is the 540 and if you start with a 400 it's the 453. Going bigger just makes you work harder and wears out parts faster.

I have not noticed any increase in vibes from any of the BB KTMs I have ridden. These are thumpers so it is normal for some vibes but the short stroke 400 crank is already smooth to begin with that I wouldn't worry too much about it. When Dave built my 540 he aligned, welded and balanced the crank and it was very nice. Unfortunately, that process makes the crank a solid non-rebuildable chunk so that is the con.



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Old 06-18-2013, 09:51 AM   #21
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...yeah, that's why I wanted the 400. I figured it would be more power than the WR290 and alot less weight. I read alot about how smooth it was too.
That's a +++ for me.
The bike is very mild, and that's what I need to ride better/quicker.

Next up, what tires to buy???
I've tried
T63's - so-so
D606's - O.K. but washy-outie front
M21's - liked these the best
MT43 rear/MT21 front - very limited use before I sold the WR.

I'm thinking a 90dirt/10street tire.
Like Pirelli XCMH/ or Scorpion Pro.

Problem is OEM is 140-80/18 rear and I don't want to make the too bigga rear tire mistake again...
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Old 06-18-2013, 10:54 AM   #22
GR0NK
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Originally Posted by Rapid Dog View Post

Next up, what tires to buy???
I've tried
T63's - so-so
D606's - O.K. but washy-outie front
M21's - liked these the best
MT43 rear/MT21 front - very limited use before I sold the WR.

I'm thinking a 90dirt/10street tire.
Like Pirelli XCMH/ or Scorpion Pro.

Problem is OEM is 140-80/18 rear and I don't want to make the too bigga rear tire mistake again...
DOT:
For racing I use Pirelli Scorpion XC fronts and Pirelli Scorpion Pro FIM. The fronts are great when new but I'm heavy and aggressive so the outside knobs tend to shred off on me before the tire has a chance to wear out. The Scorpion Pro FIM is the only Pirelli Scorpion rear that is DOT. It's predictable and durable. Come in 120 or 140 size. I run 140s but if you don't run gravel very much the 120 is better in the woods. I prefer the 140 on gravel because it lets the bike slide out a bit more before it bounces off the outside knobs.
For endurance rallies (the Dacre things in my sig, 800kms in one day) I'll run an Interco Terraflex on the back only because it can go flat and it doesn't make a lick of difference. I'll change a front flat on a timed rally but rather avoid doing a rear.

For non racing I have taken a liking to the MotoZ Tractionator S/T front and I/T rear. The S/T rear works great too but I just shred them too fast on high speed gravel. The fronts are soft terrain but wear nicely on the light bikes. The knobs have huge shoulders so they don't rip off on me but the tire does slide around a bit on gravel and deep sand under no throttle. The rears are tough and I think I will actually run a few Enduros with it to see how they hold up.
If you like the MT21 (I didn't) try the Kenda K760 front and rear. Better traction, better price. The fronts wash out on me because of the tread pattern (the knobs are all inline across the tire) but work well if you don't hammer corners too much.

Non DOT:
My tire of choice if I don't need a DOT rating is the Michelin S12 front and rear. They just work everywhere but will wear out fast on pavement or hardpack. This is an MX tire but they work so well in the woods.



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Old 06-18-2013, 11:32 AM   #23
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How are the sidewalls on the Kenda K760?
I hate pinch flats.
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Old 06-18-2013, 11:42 AM   #24
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How are the sidewalls on the Kenda K760?
I hate pinch flats.
You don't want to run them down below 10 psi. They are pretty flexy.


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Old 06-19-2013, 09:00 AM   #25
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..settled on the Pirelli Scorpion Pro FIM's.

make some progress on the cleanup...

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Old 06-19-2013, 09:00 AM   #26
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Question

Mod's, can we move this to the OC?
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Old 06-19-2013, 02:07 PM   #27
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congrats randy




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Old 06-19-2013, 02:30 PM   #28
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...hopefully I don't find this dirty lil orange' doesn't have a rotten black heart Joel...
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Old 06-19-2013, 03:21 PM   #29
tHEtREV
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Originally Posted by Rapid Dog View Post
Mod's, can we move this to the OC?
Nope.
OC is for KTM twins.

This is the place for KTM singles...
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Old 06-19-2013, 03:32 PM   #30
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Cool2

...oh...I feel more at home now.
Best get on overit the OC and delete my 400 EXC tire thread then...
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