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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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  #11  
Old 05-17-2011, 10:10 PM
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I thought it gave the 250 more everywhere, but most noticeable on the bottom. At the time there was no manfold for the GG, so I designed and made one. It was matched perfectly to the VF2 so perhaps this was part of the gain. Kent was equally impressed with the results on his 300. His manfold design was different however, being the RAD valve with the reed block machined off and a spacer added. Now all you need is the OEM manifold from a newer bike. Also, the VF2/VF3 is a tight fit in the pre '05 cases. The outer reeds can and will contact the cases at full extension. (up to 9mm per the MT engineer). I worked these areas of the cases perfectly flat with a fine file, then polished very smooth. This now functions as a reed stop, as there is approx 6 mm clearance from the outer petals to the cases. I'm sure you could improve on this by splitting the cases and machining them but my ghetto method worked fine as MT said it would.

FWIW, GasGas ran VF2s on the factory WEC bikes a year or two before they made it to OEM production.


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  #12  
Old 05-18-2011, 08:41 AM
Bailey28 Bailey28 is offline
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Perhaps this is why people say that the earlier 300's grunt harder down low than the later ones? From what you guys are saying a VF2 cage in low tension seems to punch up the bottom end compared to a later bike with the VF3 setup.

The older VF2 and maybe a little more tension on the powervalve rod, the older oem FMF gnarly, and voila! A real grunter down low.
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  #13  
Old 05-18-2011, 11:07 AM
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Just try the spacer removal first. Have the head done, and up the compression to the pump gas max of approx 200 PSI. Then, if you really want some fun. find an older CDI from an MC250 or EC/XC200. The CDI was the biggest cause of my '03 250 being a dud off the bottom. Cruiser and I had the same bikes both swapped our CDIs, same excellent results. That said, I think it would make the 300 an animal, not for me in the woods.
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  #14  
Old 05-18-2011, 12:13 PM
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pump gas max 200psi where are you getting your pump has lol. I thought safe zone in pump was 180 or so
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Old 05-18-2011, 12:59 PM
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Approx 200 PSI is per Ron at RBD, who cut two heads for me that both measure in the 190s and run fine on east coast pump premium @ 93.
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Old 05-18-2011, 01:09 PM
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wow. how much is he milling after squish setting to get there 40 thou
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  #17  
Old 05-18-2011, 09:00 PM
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You select compression/fuel, provide stock compression and squish crush test solder. Head volume is measured, milled, squish band cut, dome scooped out to get desired volume/compression.
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