In order to determine your needs we usually suggest sending your head for a free inspection and estimate. Please fill out the riders use form to help us determine the best service for you. You may also want to read our guide on modern motorcycle head machining.
General Head Maintenance: Heads 4 Valve $169, 5 Valve $199
R&R Valves, blasts away carbon, inspect, cut seats as needed, assemble and vacuum test. Parts not included.
Cut seats only: bare head, includes blasting carbon and inspection: Each $40, 4 Valve $129, 5 Valve $159
Guide and seat replacement (complete head rebuild) 4 Valve $399, 5 Valve $459
R&R Valves, clean head, replace guides and seats, cut seat profiles, ream and size guide bores, assemble and vacuum test. Beryllium Copper alloy seats and Bronze Manganese guides included. These alloys transfer heat, wear and self lubricate many times better than original.
Guide replacement and size, each, bare head, $40 1st, $20 for each additional.
Guide and seat face cutting not included.
*Seat needs to be cut after guide replacement to maintain concentricity
Seat replacement each, bare head, $120 1st $60 each additional.
Note: Guides must be in good or new condition to hold perfect concentricity for both the seat counter-bore and seat face profile.
Seat blending into port runners (a form of porting were it is most critical for flow)
This smooth’s out the casting flaws and mismatch between the seat, seat counter bore and port runner out to the guide. $65 when done with any of the above services.
Porting: Modern MX heads are basically ported for maximum flow from low to high RPM. This meets the demands for good throttle response and a wide power band. If you’re into full throttle sand drags or road racing you may benefit from larger and reshaped ports. Porting is a big money maker for many tuners and is an easy sell from the left over nostalgia from huge HP increases it had on crude automotive and ancient 2 stroke engines. I still offer porting, actually smoothing and polishing for those that want and need every advantage on the track. $250 per MX head.
Beryllium Copper Seats $79 pair
Bronze Manganese Guides $25 each
Viton Guide Seals $5 each
Stainless Steel Valve, one piece race quality $35-$42 ea
Titanium Valve OEM $56 – $95 ea
Titanium Race Quality Valve $139 – $169 ea
Valve Spring OEM $6 – $12 each
Valve Springs Race, High Quality $35 to $55
Shims spring seat, $2
