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


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  #11  
Old 12-08-2013, 11:54 AM
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Zman Zman is offline
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We did not cut the head on the 300, but with the single 0.014" base gasket the compression seems pretty high based upon the way it runs and its kicking compression compared to the other 5 GasGas bikes in our group. Ryan at Finish Line Engines said he heard some minor pinging at one point in the RPM range so we are probably at the limit for 93 octane pump gas.

Attached is the dyno graph including the graph for my big bore GG XC 327. The dyno graph confirmed what the butt dyno told me. The 300 made more peak power than my 327. The 300 revs higher than my 327 and made 3hp more but the 327 has more power on the bottom end.

Before I did the 327 big bore kit we milled the base of the cylinder 1mm to get more low end. I wanted even more a few months later so I did the big bore kit with a 76mm piston. The 327 kit made a noticeable increase in bottom end and midrange power but it is not a top end screamer.

I think the initial cylinder base milling killed the top end along the way. I recently found that the piston at BDC is about 2.5 to 3 mm above the bottom of the exhaust port. If I get some time this winter I will raise cylinder and then cut the head to bump the compression back up. The 327 makes more torque and HP up to 6500 rpm which is where I ride most of the time. On the other hand, when you want to rip, you want to RIPPPPP!!!!!!
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File Type: jpg GG dyno run.jpg (98.6 KB, 121 views)


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  #12  
Old 12-08-2013, 12:19 PM
Beta Steve Beta Steve is offline
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Strictly for comparison is my totally stock 300rr with the exception of James Dean kit and Q Stealth, on his dyno:

http://www.pbase.com/jdjetting1/image/150533914

Bike had less then 3 hours on it, not even broken in. James rides a '13 300xc with sx head, and lots of other personalized goodies, which made the exact same power as my almost stock and quiet Beta. He was grumbling...
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  #13  
Old 12-08-2013, 04:30 PM
roverhybrids roverhybrids is offline
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there was this recent thread:
http://www.gasgasrider.org/forum/showthread.php?t=15975
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  #14  
Old 12-08-2013, 08:17 PM
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Quote:
Originally Posted by Beta Steve View Post
Strictly for comparison is my totally stock 300rr with the exception of James Dean kit and Q Stealth, on his dyno:

http://www.pbase.com/jdjetting1/image/150533914

Bike had less then 3 hours on it, not even broken in. James rides a '13 300xc with sx head, and lots of other personalized goodies, which made the exact same power as my almost stock and quiet Beta. He was grumbling...
I guess I should have specified Gas Gas 250 and 300......sorry dude, don't really care about the Beta.
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  #15  
Old 12-08-2013, 08:39 PM
Beta Steve Beta Steve is offline
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That's cool, like I said, just put it up for comparison...
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Old 12-09-2013, 10:16 PM
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Oh well may as well add my old 200 dyno. Did have the squish done & comm raised a bit. Running with one base gasket lowering barrel slightly.

Bit of a pain to fit a roadtyre just to do a run but I had a mate who had a type machine & a wrecking business back then to provide an old tyre. Tried ign timing adjustment but std was best in this case. LTR jetkit had jetting close.

ignore the fact I started the test from 6000, if I'd started lower that part would have filled in, but I was lazy and looking at if I'd raise the com too high which is why I was looking at mid to top end revs.
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File Type: jpg ec200 dyno.jpg (17.6 KB, 89 views)
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  #17  
Old 02-04-2014, 09:43 PM
celler celler is offline
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Had this from an old Digital Magazine. It is from a 2008 model. After riding my 300 for a few years I can feel the flat torque curve starting at quite low RPM.
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File Type: jpg IMG_0019.jpg (123.2 KB, 81 views)
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  #18  
Old 02-05-2014, 10:59 AM
motopsycho87 motopsycho87 is offline
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Would be nice to see horsepower before and after head mods. My bike feels like a completely different animal since I got my squish correct!
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