Big-bores / Strokers / Cams - KTM Forums: KTM Motorcycle Forum
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post #1 of 28 (permalink) Old 12-12-2016, 12:47 PM Thread Starter
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Big-bores / Strokers / Cams

Do you guys do stroker kits ?

current -2007 690SM

Last edited by cors187; 12-14-2016 at 10:37 AM.
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post #2 of 28 (permalink) Old 12-12-2016, 12:55 PM Thread Starter
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Boldor, did you ever study out a big bore job on the 690?

current -2007 690SM
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post #3 of 28 (permalink) Old 12-12-2016, 01:43 PM
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Cors, I do rebuilds on cranks for single cylinder machine. I'm hoping to make a big announcement soon regarding those KTM cranks that are currently not rebuildable! I do "Stroker Cranks" utilizing aftermarket rods but do not make a "stroker kit" per se. What are you building? The magic 8 ball is thinking it may have something to do with the LC4 family and Turbos. lol


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post #4 of 28 (permalink) Old 12-12-2016, 02:42 PM Thread Starter
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I guess i was studying how to make torque . Stroker = easy torque, turbo = easy HP.
. Im not 100% sure as i never really build a KTM motor before but im guessing the LC4 has a stronger bottom end than the RFS .
The 2007 690SM i have atm cant receive a turbo(euro classifications).

this lead me to this line of thinking
Seems like every second 690 duke owner "grows out" of the power to fast. I was google searching .I knew you knew the why and why not.

i figured half the guys on a duke390( if they knew more) would be begging for a swap and go.

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post #5 of 28 (permalink) Old 12-12-2016, 03:53 PM Thread Starter
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Quote:
Originally Posted by cors187 View Post

i figured half the guys on a duke390( if they knew more) would be begging for a swap and go.
What i meant was a stroker crank/rod/ oversize piston / resized barrell , all exchange parts swap.

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post #6 of 28 (permalink) Old 12-12-2016, 05:01 PM
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Quote:
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Boldor, did you ever study out a big bore job on the 690?
Per our conversation. I truly do not understand why there doesn't seem to be a larger demand for a "Big Bore Kit". It seems the only limiting factor is Oversize piston availability. I can tell you if there is interest, I will contact the people that can resolve that issue. So let me put this out to everybody in the 690 family. Is there an interest in a exchange type Big Bore kit? How basic or inclusive would people want? I.E. Cylinder, Gasket, Piston or Cylinder, Gasket, Piston, Cams, Headwork? Is there a preferred piston manufacturer? I have contacts at Wiseco, Wossner, Vertex, JE, and CP. If the interest is there I will develop a kit. (The R&D team here is drooling btw).


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post #7 of 28 (permalink) Old 12-13-2016, 02:40 AM Thread Starter
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Just a weight thought . Ive done enough riding to know the guys that stay(model to model) on the duke stay on it for weight(kg)
Those 390 guys would be begging for torque in guessing but that 390 fits a price and starter niche.

I wonder how far the ktm factory maxed out its bores on all models and how much can be achieved in the machining .
I can see why 160kg(duke) is already "heavy" for many guys and they not keen to go a bigger bike.On the power side 70HP is not to much .

Although that ktm790 concept bikes 3 years to late already, it could be a little heavy for the bulk 390/690 users.

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post #8 of 28 (permalink) Old 12-13-2016, 03:09 AM Thread Starter
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On a road user thought.

It seems in Europe , definitely Finland that there is a power rule in play for all modified bikes.
In general if the bike modifications does not exceed a certain % of its original power , then keeping it on the road doesn't hold any real problems (reg/insurance).

Now im thinking this is a smart rule and will it encompass the world?

In any case its an interesting concept because ask your self as a bike owner.
Will i buy a faster bike or will i modify my old bike? (50HP bike)
For 5% increase in performance? (2.5Hp)
7.5% increase in performance?(3.75HP)
12% increase (6HP)
15% increase.(7.5HP)

The on paper eye to brain to road vision connection says , yeah for 15% and i could be interested on talking price.

Now taking the idea that "out of the corner performance / off the line drag race" and other hooligan dietary supplements have an increase with minimum 15% HP(i mean noticeable gains on the bike) , but if an increase in torque was added, then i think were talking the same language.

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post #9 of 28 (permalink) Old 12-13-2016, 03:29 AM Thread Starter
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WHat i want to see is some stages (theoretically before R&D crashing the party)

Big bore Barrel+piston
Big bore Barrel+piston+cam
Big bore Barrel+piston+cam+stroker crank/rod


possible extra bits
Manual cam timing adjuster
All swap and go.

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post #10 of 28 (permalink) Old 12-13-2016, 03:54 AM Thread Starter
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The historical evidence doesnt suggest that new bikes get modified internally, but having an older 690 cam / big bore / stroker in your collection at under 150kg is rather exciting.

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