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Old 03-04-2011, 05:55 PM   #31
they
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Quote:
Originally Posted by K2m View Post
I'm running 07 SD cams in my 04'S'

Also 39 FCR's with TPS, and copy's of Africa Queen extractors.
So how did it turn out? Big power change? How about response?
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Old 03-05-2011, 04:39 PM   #32
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Originally Posted by MortimerSickle View Post
If the 990 cams are milder than the 950, I wonder whether the 950 cams would work in a carbed 990. Fit? Enough clearance? Better performance? Hmmm....

The reason I wonder is that I already have a set of 950 cams sitting on the shelf, and my 990 is already carbed.
As I commented in the other thread, this is probably the way I'm going to go too (put 950 profile cams in the carb'd 990), unless someone can definitely confirm the 990 SD profiles are about the same as the 950.

The thought of running around on a KTM with cams no more aggressive than a XR or KLR just doesn't seem right.

BTW: I posted a Want-To-Buy listing in the Flea Market http://www.advrider.com/forums/showt...7#post15345347
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Old 03-05-2011, 04:55 PM   #33
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Quote:
Originally Posted by BillyD View Post
As I commented in the other thread, this is probably the way I'm going to go too (put 950 profile cams in the carb'd 990), unless someone can definitely confirm the 990 SD profiles are about the same as the 950.

The thought of running around on a KTM with cams no more aggressive than a XR or KLR just doesn't seem right.

BTW: I posted a Want-To-Buy listing in the Flea Market http://www.advrider.com/forums/showt...7#post15345347
Two questions:

Are you sure you will have enough piston clearance? Different pistons, different stroke.

Would you not get better performance by using just the intake from the 950, and keep the 990 exhaust.

Quote:
Originally Posted by MortimerSickle View Post
...
Oddly, this seems to work out to more lift on intake (9.82,) and less lift on exhaust (8.45,) when compared to your figures on the 990 (8.99 for both.)
I'm no tuning wizard, so I am just guessing.



.
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Old 03-05-2011, 08:58 PM   #34
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Quote:
Originally Posted by MortimerSickle View Post
Two questions:

Are you sure you will have enough piston clearance? Different pistons, different stroke.

Would you not get better performance by using just the intake from the 950, and keep the 990 exhaust.

I'm no tuning wizard, so I am just guessing.
.
Hmmm... good point. I hadn't realized the 950 and 990 were different bore x strokes, which they are.

Plus, if there is a clearance issue, it would most likely be on the intake cam. Pulling the head and using clay is the safest way to check. Pulling the valve spring won't reveal side clearances if they are close, but not interfering.

But then again, if we can confirm timing of the cams Tahoeacre mentions above and that they work in a 990 without fly-cutting the pistons or sinking the valves into the head, then any cam that is more mild should also work.

Bill
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Old 03-06-2011, 08:40 AM   #35
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We'll know soon enough as I got a set of 950 cams on their way from Flanny. If the valves hit, it won't be the first time I've bent some.
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Old 03-06-2011, 07:48 PM   #36
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You might wanna turn the engine over a couple of times when you install the 950 cams. At least you'll know if they hit before punching the starter button. Doesn't mean they won't bash the pistons when the engine is all nice and toasty and you bounce it off the rev limiter (clay trick is the only way to tell that), butt its better than nothing.
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Old 03-07-2011, 10:30 AM   #37
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Horse Shoes and...

I think I'll just pin it off the rev limiter immediately and see if the POS grenades.
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Old 03-07-2011, 03:01 PM   #38
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DISCLAIMER: All observations made in this post are mine and based solely on my own anecdotal experiences, and may contain large doses of facetiousness. YMMV, of course. You are "on your own", and I take no responsibility if someone tries anything in this post and gets into trouble with the law, damages their person or property, or goes blind. Take everything you read or hear "anywhere" butt especially on the Web with a large dose of salt.

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Old 03-07-2011, 04:20 PM   #39
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You may as well just pull the valves now and bend 'em in a vice with a hammer...save you a lot of assemble/tear down time....
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Old 03-26-2011, 11:18 PM   #40
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Note Corrected 990A Intake Close Timing at .040" Lift





.040" VALVE LIFT .050" VALVE LIFT

CAM LIFT (in) LOBE CENTER
DURATION OPEN CLOSE OVERLAP DURATION OPEN CLOSE OVERLAP
STOCK KTM 990 ADVENTURE












INTAKE 0.354 103 atc 224 9 btc 35 abc
216 5 btc 31 abc
EXHAUST 0.354 101 btc 223 32 bbc 11 atc 20 215 28 bbc 7 atc 12
















STOCK KTM 950













INTAKE 0.347???
110 atc 231 5 btc 46 abc
226 3 btc 43 abc
EXHAUST 0.335 109 btc 230 44 bbc 6 atc 11 223 40 bbc 3 atc 5
















SUPERMOTO RACE, WEB CAMSHAFTS PER TAHOEACRE








INTAKE 0.452 108
261 22 btc 58 abc
254 19 btc 55 abc
EXHAUST 0.435 108
257 56 bbc 20 atc 43 250 53 bbc 17 atc 72
















KTM LC-4 600cc (1989—1991), 400 (1995) TT Style Power, Strong mid-range, Great Throttle Response



ROTAX, CAN-AM, KTM, 500, 560, 600 (1983—1990), Best cam for 500cc 1/2 Mile and TT




INTAKE 0.450 108
264 24 btc 60 abc
257 21 btc 57 abc
EXHAUST 0.450 108
264 60 bbc 24 atc 48 257 57 bbc 21 atc 77
















HONDA ATC-200X, TRX-200SX (1986—1988)










INTAKE 0.355 106 atc 222 5 btc 37 abc
215 2 btc 34 abc
EXHAUST 0.355 106 btc 222 37 bbc 5 atc 10 215 34 bbc 2 atc 35
















KAWASAKI KLR-600 single (1984—1986) and KLR-650 (1987—1992)







INTAKE 0.345 104 atc 227 10 btc 38 abc
220 6 btc 34 abc
EXHAUST 0.355 104 btc 222 35 bbc 7 atc 17 215 32 bbc 4 atc 38
















KAWASAKI ZX-7 750 (1989—1990)











INTAKE 0.354 104 atc 238 15 btc 43 abc
231 12 btc 40 abc
EXHAUST 0.338 104 btc 230 39 bbc 11 atc 26 223 36 bbc 8 atc 47
Source: MegaCycle Cams and 950/990 measurements by BillyD







bold italics = estimates
???=Possible Math Error. Maybe .040" too low. Subject to verification.













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Old 03-27-2011, 06:42 AM   #41
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Are those Supermoto cams the same as the 2009+ 990 Adv and "R" cams?
I recall the 09+ got the SD heads and cams, or are they one and the same?
But I could be wrong.
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Old 03-27-2011, 07:41 AM   #42
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Catalina38:

I can't comment on what the "R" or SD cams as I have not measured them and KTM doesn't see fit to publish timing specs (the morons).

Regarding the "Supermoto" cams included above, the lift and duration specs came from Tahoeacre and are reportedly used by some Supermoto race time in the Europe. They are supposedly made by Web Camshafts, who usually specs their cams at .050" valve lift. I assumed 108 degree lobe centers and backed into the timing figures listed above for that cam. How this might compare to the "R" or SD cams is anyone's guess.

I picked 108 lobe centers because MegaCycle has flat track and TT cams with lifts and durations similar to those provided by Tahoeacre. Interestingly, one is for the KTM LC-4.

Regarding the stock 950 cams. They do have longer duration with more "normal" lobe centers as expected; however, it is interesting that they have even less lift than the stock 990 cams.

This suggests to me that KTM purposely went with shorter duration and higher lift on the early 990s in effort to reduce intake manifold pressure variations at low throttle openings. Such flucuations can be difficult for fuel injection systems that are based, in part, on MAP sensors. The negative effects of reduced duration at WFO can be partially offset by increasing lift without affecting MAP as much at low throttle openings.

FWIW...rely upon any of the foregoing at your own risk.
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Old 03-27-2011, 07:56 AM   #43
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I think I'll just pin it off the rev limiter immediately and see if the POS grenades.
Bill,
That sounds like something that would be fun to do at our next campout.
It would be a perfect encore after Tmex trips through the fire pit.
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Old 03-27-2011, 08:21 AM   #44
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How accurate are the 950 cam timing marks anyway?

While playing with the 950 cams, I noticed that the timing marks on the rear cams seem to be about 5 degrees off (haven't checked the front cams yet).

With the rear cylinder at true TDC, the marks are like those shown in these photos from cpmodem's valve adjust write up at http://www.ktm950.info/how/Valves/cp...ve_adjust.html

Notice how they don't line up exactly with the gasket surface. To get them lined up exactly, one must rotate the crank another 5 degrees ATDC.

Either the marks aren't very accurate or cpmodem and I have timing chains that are stretched exactly the same amount.






Photos: cpmodem
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Old 03-27-2011, 08:23 AM   #45
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Bill,
That sounds like something that would be fun to do at our next campout.
It would be a perfect encore after Tmex trips through the fire pit.
bk
Go away, can't you see I'm making fun of your lowly KLR...
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