THE FIRST TIME EVER, you can buy an American made four stroke
and have the support of a major American engine producer.
This way you're assured the highest quality parts and
technical support because you deal with the people that make'em.
Most Unique Design of any Four Cycle
Ringed-ABC construction Double ball bearing supported
crankshaft Rotary Valve porting Two year warranty
unique design of four strokes are the quietest made. In
fact, the VT 21 rivals an electric. Both engines are equipped
with suburb mufflers that easily meet all DB requirements.
(bronze, brass, chrome) rotary valves never require
adjustment. No valve float and or power robbing valve
spring tension to overcome.
has always been known as the smooth runners. The one piece
hardened steel crankshaft with a massive counter weight
is supported by 2 ball bearings. A light alloy forged
conrod and cast piston are balanced perfectly. You'll
be surprised just how smooth a engine can be.
engines have always been renowned for their unsurpassed
quality and precision. This tradition continues as all
HP four cycles are produced with the latest computer controlled
machines in RJL's Southern California facility.
roller bearing supported valve
than the standard bushing, you can purchase the bearing
head version to take the upward force of the valve during
combustion. Both engines provide the same power, however
the bearing head is less critical on the oil scavenging
from the exhaust.
rotary valve technology
Brass, Chrome. HP pioneered rotary valves in model engines
and utilize a true hard chrome valve running in a bronze
sleeve. This arrangement provides the longest wearing
and least friction of all metallurgy in this high temperature
ringed piston & cylinder assembly
high silicon piston fitted with ring runs in a hard chrome
plated brass sleeve that is precision ground to .0001
of an inch on both the inside and outside diameters.
& bushed connecting rods
VT connecting rod is forged from high strength aircraft
grade aluminum alloy then precision machined and fitted
with bronze bushings at both ends.
from solid bar stock with large counterbalance and then
fully heat treated, these crankshafts are then precision
ground to a tolerance of .0001 of an inch. This is why
HP engines are known as the smoothest runners.
VT's are equipped with double ball bearings on the crankshaft.
The front is sealed on both sides eliminating blow by
and rusting that is common in four cycle engines.
HP engines are pressure die cast from aluminum alloys.
These castings are made by forcing molten aluminum into
high strength tool steel dies at pressures as high as