Head. E22 style. RED TAG Stage III tuned 70cc 90cc 110cc

This head has the same valve sizes and dome as an E22 head. It has been fully Stage 3 tuned and gas flowed by OORacing This head produces less heat due to reduced sharp edges hence will hold power when used in endurance.

In stock ready for dispatch

2 Options now for different bore sizes, we have 47mm 70cc & 90cc or 52.4mm 110cc

Ports are already a good size so we don’t make them any bigger .

Ideal to raise the compression on 110cc engines

Whats included:

• Cast head  Gas flowed
• Long duration cam 5.63mm lift from 110 or 1mm higher lift
• Cam bearings
• Cam sprocket bolts (3 bolts)
•  Inlet valve 24mm
• Exhaust valve 20mm
• Valve guides (2 Guides)
• Valve seals (2 Seals)
• Collets (4 Collets)
• RACE valve spring (dual type 40 PSI at full compression) for 1mm extra lift cam with 2mm pre load spacers
• top cap (retains collects)
• rockers
• rocker shafts
• 6mm Exhaust studs

This works well with 47mm to 52mm diameter cylinders. Ideal for C90 conversions upgrading the existing head to include a bearing type camshaft for better performance, tuning and less drag.

Technical data:

• Exhaust gap:    0.12mm
• Inlet gap:          0.10mm
• Head torque:     10ft/lbs

Check the head torque when the engine has cooled down from its first run.

CLICK HERE for a standard version of this same head

Useful links:

• Metric Feeler gauge
• Top end Gasket set

We recommend you don’t rely on the timing marks and set valve timing via LCA, they way it prevents valve damage and will give you the best performance. Reason is some engines have the crank sprocket pressed on not 100% correct.

You need a minim of 2mm piston to valve clearance 12 degrees before and after TDC on both valves, any less you will have piston to valve contact at higher revs resulting in a valve dropping.

This head should be fitting by a professional, specialist tools required.

Valve clearances Inlet 3 thou Exhaust 5 thou

Head torque 10 ft-lb’s” Oil nuts and threads”

Cam timing don’t rely on OE marks as they can be wrong, dial cam in 105 degrees LCA both inlet and exhaust.

We recommend you change the cam chain and all 4 rubber components relevant to the cam chain tension, and only run mineral oil to prevent the rubbers going hard and breaking up.

Valve float caused by the above cam chain tension will result in exhaust valve making contact with piston.

Check piston to valve clearance at 12 Degrees before & after TDC you need a minimum of 2mm

Re check head torque after first heat cycle

Failure to do above can result in valves clipping piston and eventually bending or dropping valves.