04-04-2020, 06:29 PM
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#1 |
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Join Date: Aug 2013
Location: Goodyear, Arizona
Posts: 407
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Head porting question
I've gotten a replacement head from Pearce motorsports and pulled the valves in prep, is it worth pulling the valve guides out as well?
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2020 Tao TBR7 9.3:1 PnP head CRF230F exhaust 4 degree advance key 290 degree cam Nibbi PE30 and cone filter Front fork brace |
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04-04-2020, 06:39 PM
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#2 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,030
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Quote:
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04-05-2020, 01:12 PM
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#3 |
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Join Date: Aug 2013
Location: Goodyear, Arizona
Posts: 407
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I was also thinking about skimming the head to raise the CR, but looking at the proximity of the intake port to the deck, I'm not sure if this is possible. I measured the deck to the underside of the fun and it was .07in, common wisdom is to take .04in off. Does this look right?
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2020 Tao TBR7 9.3:1 PnP head CRF230F exhaust 4 degree advance key 290 degree cam Nibbi PE30 and cone filter Front fork brace |
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04-05-2020, 02:56 PM
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#4 |
Join Date: Mar 2020
Location: Pennsylvania
Posts: 87
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I'm certainly no expert on this but I'm preparing to do this as well once my head arrives. All the research I've seen suggests that 1mm (.040") is common on these motors. It should yield a CR of 10.3:1.
If you can post your progress it would be much appreciated. I'm looking forward to doing this to my TBR7. |
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