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Old Yesterday, 08:12 PM   #1
J Lewis OP
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Joined: Apr 2003
Location: Pahrump, NV
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KTM 950 motor swap to 990?

Quick question that will cause a few more I suspect.

I have a recently rebuilt 100,000 mile 950 that ticked since it was rebuilt. I tried everything to locate the tick until it clanked (bent left front intake valve) but I'm not totally sure that was actually the source of the tick.

Long story short, I'm thinking about just dropping in another engine. Has anyone put a 990 motor in with the 950 carbs, is this just a bolt on operation?

Any lines on motors that are good for another 100,000. I still really like this bike.

JIMMY
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Old Yesterday, 08:31 PM   #2
jmvance1
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Can't help with the swap question but here is a 2010 990 with 10k+ miles from a wreck that could work: http://www.ebay.com/itm/KTM-990-Adve...3D121561329933

And an 07 for less money:
http://www.ebay.com/itm/2007-07-KTM-...9eb10d&vxp=mtr

Why not find a good 950 motor and swap that instead or rebuild the top end on your motor that broke? Good luck and I'll keep my eyes open for ya.

jmvance1 screwed with this post Yesterday at 08:48 PM Reason: Added additional info
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Old Yesterday, 08:58 PM   #3
spencergt66
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If you keep the carbs all you will need is to swap the tone ring I believe
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Old Yesterday, 09:10 PM   #4
J Lewis OP
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Low mile 950 motors are a little harder to find. But if you know of one, let me know.

JIMMY
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Old Yesterday, 09:40 PM   #5
Somewhere Far Beyond
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Quote:
Originally Posted by spencergt66 View Post
If you keep the carbs all you will need is to swap the tone ring I believe
Must mean the timing wheel.


There are a few threads on this forum by people who have switched to carbs on a FI 990 motor and to FI on a carbed 950 motor.

I believe in the case of taking an already carbed system and dropping in a 990 motor, the timing wheel swap is all that's needed. And maybe something about a camshaft swap. I don't remember. I remember it not necessarily being all that economical. Your gains (if any) would be minimal. Might be better to just rebuild the top end again.

If you do a swap, please to be posting pictures?
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Old Yesterday, 09:55 PM   #6
Drwnite
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Dan950ser might have a few ideas, he has a 990 engine planted in a Super Enduro, which is for sale!

http://advrider.com/forums/showthread.php?t=1046431
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Old Yesterday, 10:55 PM   #7
Pete640
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It's just the timing wheel which you can take from your 950, just remove the clutch basket and its a bolt out part. It even has a small indent so you cannot muck up the installation/timing. no need to change cams. If so just replace the 990 ones with the parts from your 950 if you source a SD motor as their cams are a little more suited to higher rpm
Depending on your headers (OEM/aftermarket) you may need to go up one size in the jetting but that's a tuning issue
Grab a ex ADV or SMT motor as they have the wide ratio gearbox. The SD motor has a narrow box
KTM have made it very easy to do a changeover
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