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  #1  
Old 4 Days Ago
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Keenaz Keenaz is offline
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Can 2t suspension be tuned to give 4t front end stability/confidence?

Attended the Transmoto 6hr today, jeez these guys put on a great event.

Track was tough with lots of off camber corners and roots/rocks. I rode my Beta 300rr for the first two laps and then took a mates KX450 out. Apart from the fact that it is setup for him 10kg heavier, and its WAY more power than I can handle the thing turned in a lot better and gave me heaps more confidence in the (want to say bull dust but sure its not) dusty corners.

Can you ever get the same turn in confidence (I know it will never be as planted) with a 2t?
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Old 4 Days Ago
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Bikes have infinite tuneability , to adjust to
your riding style.
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Quote:
Originally Posted by Keenaz View Post
Attended the Transmoto 6hr today, jeez these guys put on a great event.

Track was tough with lots of off camber corners and roots/rocks. I rode my Beta 300rr for the first two laps and then took a mates KX450 out. Apart from the fact that it is setup for him 10kg heavier, and its WAY more power than I can handle the thing turned in a lot better and gave me heaps more confidence in the (want to say bull dust but sure its not) dusty corners.

Can you ever get the same turn in confidence (I know it will never be as planted) with a 2t?
Unless you tell me you had the clutch in whenever you were off the the throttle what you're feeling is the balance that comes from the extra deccel that a 4t provides, the backs almost always driving or retarding, that's a significant change to chassis balance.

There's a reason speedway bikes get away with no brakes, you wouldn't want to be doing that with a 2 stroke.

P.S...You can't quite mimic it by dragging the rear brake, different force coupling.
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Originally Posted by Tom68 View Post
Unless you tell me you had the clutch in whenever you were off the the throttle what you're feeling is the balance that comes from the extra deccel that a 4t provides, the backs almost always driving or retarding, that's a significant change to chassis balance.

There's a reason speedway bikes get away with no brakes, you wouldn't want to be doing that with a 2 stroke.

P.S...You can't quite mimic it by dragging the rear brake, different force coupling.
Interesting. I get the while traction via reciprocating mass thing, I had a 500 exc before the 300rr and that thing used to just plow through the chunder.

There was just a dozen guys or so on 2t's that just seemed to have incredible corner speed & stability. Must have just been a higher level of skill and a larger set of gonads!!!
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Originally Posted by Keenaz View Post
Interesting. I get the while traction via reciprocating mass thing, I had a 500 exc before the 300rr and that thing used to just plow through the chunder.

There was just a dozen guys or so on 2t's that just seemed to have incredible corner speed & stability. Must have just been a higher level of skill and a larger set of gonads!!!
Reciprocating mass is just vibration, somewhat balanced on 4 strokes.
Moment of inertia (stabilizing force) is greater on 2t's, heavy long stroke cranks.
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Quote:
Originally Posted by Keenaz View Post
There was just a dozen guys or so on 2t's that just seemed to have incredible corner speed & stability. Must have just been a higher level of skill and a larger set of gonads!!!
Could have better suspension setup than you had to.

2t 4t lighter weights have the potential to corner faster on flat surfaces, berms and ruts change that though.
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Having moved from the big Beta 498RR 4T to the KTM 300EXC 2T I can appreciate what you're talking about. on the 4T you cna just bulldoze your way through rocks and roots and things with confidence, but the same stuff on the 2T is pretty unnerving with the front end deflecting and bouncing a lot easier.

I put an XRC steering dampener on and that has helped a ton. I am now playing around with the valving to get the front end a little more plush and less prone to deflecting. It can definitely be improved, but I am not sure the laws of physics will ever let it be as sure-footed as the heavier 4T. Just like a 4T can never be made ot feel as light and flickable as a 2T.
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Having moved from the big Beta 498RR 4T to the KTM 300EXC 2T I can appreciate what you're talking about. on the 4T you cna just bulldoze your way through rocks and roots and things with confidence, but the same stuff on the 2T is pretty unnerving with the front end deflecting and bouncing a lot easier.

I put an XRC steering dampener on and that has helped a ton. I am now playing around with the valving to get the front end a little more plush and less prone to deflecting. It can definitely be improved, but I am not sure the laws of physics will ever let it be as sure-footed as the heavier 4T. Just like a 4T can never be made ot feel as light and flickable as a 2T.
just add weight to your 2t/flywheels also=4t
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ian9toes ian9toes is online now
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Drop your forks down to flush with the top of the tripple clamps and the front end will feel much more planted, but less flickable.

It's worth experimenting with to find the right compromise, it costs nothing but a little time.
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Might as well face up to the facts Ian.....four strokes are better
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