| Head |
Brand |
Grind |
Intake Lift |
Intake Duration @ .050" |
Exhaust Lift |
Exhaust Duration @ .050" |
Notes |
| E22 |
Stock |
OEM |
5.5mm |
|
5.5mm |
|
|
| E22 |
Crower |
G2 |
6.5mm |
|
6.5mm |
|
|
| E22 |
Dr ATV |
'Race' |
6.92mm |
|
6.92mm |
|
|
| Modern Honda |
Honda |
CRF70 Stock |
5.055mm |
214deg |
4.93mm |
214deg |
|
| Modern Honda |
Honda |
CRF50 Stock |
3.99mm |
|
3.99mm |
|
|
| Modern Honda |
Web Cam |
CRF50 #25 |
4.06mm |
210deg |
4.06mm |
206deg |
|
| Modern Honda |
Web Cam |
CRF70 #98 |
6.20mm |
240deg |
6.20mm |
246deg |
|
| Modern Honda |
Honda TB |
'Race Head' |
6.99mm |
230deg |
6.99mm |
230deg |
|
| Modern Honda |
Honda TB |
'Stock Head' |
5.97mm |
196deg |
5.54mm |
208deg |
|
| Modern Honda |
Powroll |
|
6.76mm |
210deg |
6.76mm |
206deg |
|
| Modern Honda |
Crower |
CRF50 G1 |
5.67mm |
214deg |
5.67mm |
214deg |
|
| Modern Honda |
Crower |
CRF70 G1 |
6.6mm |
224deg |
6.6mm |
224deg |
|
| Modern Honda |
Crower |
CRF70 G2 |
6.53mm |
236deg |
6.53mm |
236deg |
|
| Modern Honda |
Kitaco |
'Stock head' |
|
222deg |
|
227deg |
Durations taken @ .0394" lift |
| Modern Honda |
Hot Cam |
Stage 1 |
4.90mm |
212deg |
4.45mm |
210deg |
Durations taken @ .0394" lift |
| Modern Honda |
Hot Cam |
Stage 2 |
5.08mm |
222deg |
4.95mm |
216deg |
Durations taken @ .0394" lift |
| Kitaco Ultra |
Kitaco |
STD |
|
265deg |
|
265deg |
Durations taken @ .0394" lift |
| Tak +R |
Takegawa |
S12 |
7.87mm |
|
7.87mm |
|
|
|
Kitaco |
'Dax cam' |
|
224deg |
|
220deg |
Durations taken @ .0394" lift |
|
Kitaco |
SE30 |
|
240deg |
|
240deg |
Durations taken @ .0394" lift |
|
Kitaco |
SE35 |
|
246deg |
|
248deg |
Durations taken @ .0394" lift |
|
Takegawa |
R20 |
7.11mm |
240deg |
6.6mm |
240deg |
Not sure what lift spec was used for the duration measurements |
|
Crower |
#18 |
6.7mm |
248deg |
6.02mm or 6.53mm |
|
Exhaust varries by application |