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DannoXYZ · October 29th, 2019, 08:55 PM

Unless you’re racer with needing to get trophies and points to put food on table, do ‘t bother with rebuilding head. There’s plenty of used good-condition heads on market for much, much cheaper than what it costs for proper rebuild. To fix valve-recession issue you need to:

- replace factory valve-seats with copper-beryllium seats for much better heat-transfer from valves

- replace intakes with stainless-steel valves
- replace exhausts with Inconel valves
- get fully-radiused valve-seat cut. Way, way better than 5 or 7-angle valve jobs

Now you’ve done upgrade/repairs to head that makes effort worthwhile to fix factory valve issues.

October 29th, 2019, 08:55 PM	#16
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Unless you’re racer with needing to get trophies and points to put food on table, do ‘t bother with rebuilding head. There’s plenty of used good-condition heads on market for much, much cheaper than what it costs for proper rebuild. To fix valve-recession issue you need to: - replace factory valve-seats with copper-beryllium seats for much better heat-transfer from valves - replace intakes with stainless-steel valves - replace exhausts with Inconel valves - get fully-radiused valve-seat cut. Way, way better than 5 or 7-angle valve jobs Now you’ve done upgrade/repairs to head that makes effort worthwhile to fix factory valve issues.