12-08-2017, 03:45 PM | #2 |
Join Date: Jan 2017
Posts: 37
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stock exhaust port and ported exhaust. Head was decked .7mm
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12-08-2017, 04:02 PM | #4 |
Join Date: Oct 2015
Location: connecticut
Posts: 980
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awesome! any idea what your compression ratio will be now?
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12-08-2017, 04:09 PM | #5 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Ya beat me to it! Pretty decent work so far. I might have left the exhaust port a little smaller at the exit to account for the copper gasket flattening out a bit, but it should still be pretty close.
If you deck .7mm, (.0276") that should put the compression right around 9.7:1 (give or take a tenth of a point. You could still remove some material from the port roof leading up to the valve guide, and around the sides of the guide as well to open that point up a bit more. Have any pictures of the runner bowls from the combustion chamber side after the port work. I have been contemplating how to attack them with mine.
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12-08-2017, 04:09 PM | #6 |
Join Date: Jan 2017
Posts: 37
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I went from a 98 main jet to a 100 main. I"m gonna try a 105 next
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12-08-2017, 04:22 PM | #7 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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You must be at elevation if you were running a 100 main jet after the port work, especially with that exhaust.
I am waiting for my new carbide burrs and some sanding rolls to get here so I can attack my head. My plans are a bit more aggresive for the ports at the valve guides and bowls. There is a lot of material that can be removed there. I also plan on decking .035 and smoothing the ridges down around the valve seats to unshroud them a little bit. (hoping to end up around 9.6-9.8ish) and polish the heck out of the chamber and exhaust port. I have another week until I even get home to start my head. Stupid adult responsibility called work...
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12-08-2017, 04:39 PM | #8 |
Join Date: Jan 2017
Posts: 37
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Yeah i'm at 6500 feet
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12-08-2017, 06:59 PM | #10 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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Looks good. Nothing too aggressive I see, just nice and blended/evened out.
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12-08-2017, 10:24 PM | #11 |
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Join Date: Oct 2016
Location: Houma, La.
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Nice job Silva I'll be doing the same as soon as I get some spare time to do it.
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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12-10-2017, 08:41 PM | #13 |
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Join Date: Oct 2016
Location: Houma, La.
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Did you get a chance to check if it may a difference in your top end speed?
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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