Os 105 hzr and os 91hzr 3d black head

[Planehazza]

Apart from the specks do u think there is really a huge difference in power.

91 specks

Specification
Displacement: 0.91 cu in (14.9 cc)
Bore: 1.09 in (27.7 mm)
Stroke: 0.98 in (24.8 mm)
Output: 3.6 hp @ 15500 rpm
Practical RPM Range: 2,000-16,500
Weight (w/o Muffler): 21.2 oz (603 g)


105 specks

Specification
OSMG1961 105HZ-R
Displacement: 1.048 cu in (17.17 cc)
Bore: 1.442 in (29 mm)
Stroke: 1.024 in (26 mm)
Practical RPM: 2.000-16,500
Output: 3.8 ps @ 15,000 rpm
105HZ Weight: 21.03 oz (596 g)
105HZ-R Weight: 21.46 oz (608 g)

all in all the 105 is only .2 of hp over the 91, so for those who had tried these engine what feedback can u give thanks.

3.8ps is ~3.7 hp so not much difference between them in that respect.