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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc. |
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#11
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Quote:
__________________
'05 Gas Gas 300 '97 Aprilia Pegaso 650 '99 KTM 200 '95 ish XR630 (died many times in Oz) |
#12
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What pipe and silencer are you running?
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#13
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The power valve (or exhaust valve) opens up proportionally with the engine's RPM.
I haven't seen the mechanism properly but seen photos of it. I'm pretty sure you'll be able to add some washers or spacers to limit the travel of the mechanism, thus preventing the exhaust valve opening fully and in turn softening the power at higher RPM. You could also experiment with disconnecting the linkage and locking the exhaust valve in it's closed position. In effect this lowers the exhaust port giving more power at lower RPM and less at higher RPM. These are a bit expensive, but might be exactly what you're looking for... http://www.enduropuro.it/shop/en/gas...lve-cover.html Good luck, Dave. |
#14
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That scenario sounds like it could be solved with some clutch.
Other than that you got lots of suggestions, seems like you will need to do a bunch of experimentation to find the right trade off.
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2006 Gas Gas EC250 2011 Husaberg FE390 |
#15
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Again, you face issues with clutch control as fatigue builds throughout the duration of a race, but imo that becomes more to do with conditioning (and gassing our from poor technique/line selection) than with the engine and setup itself. Last couple hours I've been riding with my stock expansion chamber kinked at the header, coupled with a nice big dint on the backside where it's been pushed into the frame. It's definitely moved the power down and where it used to pull like a train in the upper rpm you can easily feel the power drop off as the revs climb on. For 90% of my riding it hasn't slowed me. The point being I wouldn't discount a change of pipe either. Port/deck height changes can move it around too. |
#16
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And in relation to the original jetting side. Richer. You can go rich till she starts to blubber. It might soften it up some, probably suck some more juice too.
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