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All Other Bikes... KTM, Husky, VOR, Husaberg & Hondayamazuki...


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  #31  
Old 01-06-2016, 06:18 PM
hadfield4wd hadfield4wd is offline
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Default GasGas15 vs Beta 15/16....

Thanks. Yeah I think every bike has its issues, I just wanted to know the GG ones. I know I love mine!!!

I will not buy orange.


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1999 GG EC 250 Six Days
1999 Cagiva Gran Canyon
2001 Aprilia Falco
2001 Triumph Speed Triple for my 20 year old
2000 GG XC250 for my 20 year old
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  #32  
Old 01-06-2016, 06:51 PM
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JP4 JP4 is offline
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Hey Jake,

If you get the opportunity, have a look over and go for a ride on a Sherco. I'm curious to see what you think of the bikes.

Cheers,

Jason
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  #33  
Old 01-06-2016, 07:03 PM
Terrence R Terrence R is offline
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http://youtu.be/ZUypEh1_mTM

JP4,
This link is what I was basing the power delivery topic about. I'm just realizing that's it's about the 2015 model. So, the 2016 may differ. I'm yet to ride a Sherco though. I would love to try one though.
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  #34  
Old 01-06-2016, 09:00 PM
celler celler is offline
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Quote:
Originally Posted by Jakobi View Post
If you consider the sole purpose of a powervalve, it is to provide an optimum port size for given rpms. By nature it allows one to change the feel of the bike, but realistically it is there to provide a smaller port at low revs (improving bottom end response), while still opening up to allow max rpm and over-rev.

The transition is where the magic happens. If it opens too soon you can get a dip in power, if it opens too fast you can get a dip/spike. If it opens too late it can cause the bike to feel like it signs off and then hit again. Ideally it will be matched with the jetting, port mapping/timing and ignition to provide the best and smoothest curve through the transition and at part port.
Understood but what is being understood much better with the new designs is the power valves can be set to progressively open over a wider RPM band. The numbers I have seen is that pre 2015 GasGas and YZ open over 500 RPM while the Beta, KTM, and new Yamaha open over 1500 RPM yielding much smoother power. I actually think Sherco has the answer with the Servo power valve. Now back on topic I'm trying to get input if the 2015 GasGas powervalve redesign has seen an improvement or did they just do a preload adjuster. If they were in doing a redesign I would guess they easily could of improve this.
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