Super Reliable 2 stroke, Max RPM 12K, 40MPH

Mike St

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Tired of reading about Chinese 2 strokes blowing up, losing wrist pin clips,
clutch problems? Why buy an unreliable Chinese 2 stroke engine when you
can purchase a super reliable 2 stroke that comes from the factory from a
company that has been manufacturing reliable high rpm 2 strokes for
decades. You won't have to upgrade with carbs, porting, cdi, tuned
pipes - the engine comes completely engineered for high performance
and at a reasonable price. And that engine is the Zenoah G43L, capable
of an amazing 12,000 rpm max. This engine combined with a rear mount
double right sided chain drive will give thousands of trouble-free miles at
top speeds of 40-50mph if you prefer. At 11,000 rpm, using an 11T
drive sprocket and a 44T rear sprocket the top speed will be about
42 mph. EXPECT NOISE, BUT IF YOU'RE ALREADY INTO 2 STROKES
AND SPEED, THIS IS THE PERFORMANCE ENGINE YOU MAY WANT.
You can purchase the engine and not be required to become a 2 stroke
motor mechanic.
 

DAMIEN1307

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Tired of reading about Chinese 2 strokes blowing up, losing wrist pin clips,
clutch problems? Why buy an unreliable Chinese 2 stroke engine when you
can purchase a super reliable 2 stroke that comes from the factory from a
company that has been manufacturing reliable high rpm 2 strokes for
decades. You won't have to upgrade with carbs, porting, cdi, tuned
pipes - the engine comes completely engineered for high performance
and at a reasonable price. And that engine is the Zenoah G43L, capable
of an amazing 12,000 rpm max. This engine combined with a rear mount
double right sided chain drive will give thousands of trouble-free miles at
top speeds of 40-50mph if you prefer. At 11,000 rpm, using an 11T
drive sprocket and a 44T rear sprocket the top speed will be about
42 mph. EXPECT NOISE, BUT IF YOU'RE ALREADY INTO 2 STROKES
AND SPEED, THIS IS THE PERFORMANCE ENGINE YOU MAY WANT.
You can purchase the engine and not be required to become a 2 stroke
motor mechanic.
Let me see if i got this straight, you can buy this motor for $229.99, but the clutch housing cover in either chrome tone or black is an add-on costing an additional $85.00 ???...I would think that would be a safety hazard without a cover in place while running it...What makes that cover worth 85 bucks ???

I'm not impressed with an incomplete motor, I consider the clutch cover a necessary part of the motor system, not an accessory.


 

Mike St

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Messages
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Don't know what you're talking about. The engine bolts right up to the
5:1 gearbox. All that is necessary is the engine with clutch and the
gearbox. It's really no different than a friction drive where the
friction drive bolts directly against the motor, just like in my pics..
 

Sidewinder Jerry

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Rockwood, TN
Don't know what you're talking about. The engine bolts right up to the
5:1 gearbox. All that is necessary is the engine with clutch and the
gearbox. It's really no different than a friction drive where the
friction drive bolts directly against the motor, just like in my pics..
This is good it can bolt up to the 5:1 gearbox. However check out these ststs:

Total Displacement: 41.5cc
Bore: 40 mm
Stroke: 33 mm
Piston Rings: 2
Compression: 7.5
Carburetor: Walbro WYK-93
Oil Mixture: 40:1
Horsepower: 1.97 hp at 7500 rpm
Torque: 1.66 lb ft at 5500 rpm
Clutch Diameter: 78 mm
Spark Plug: NGK BM7A
Approx Idle RPM: 2500 rpm
Approx Max RPM: 12000
Weight: 6.5 lbs (2.96kg)

Although it can go up to 12k rpm it should never be pushed to that. That's 12k under no load or long duration. It has a max hp of 1.97 at 7500 rpm; once you go over that hp will begin to diminish under load. After you get beyond max hp the contributing factors to speed then become aerodynamics, weight reduction, gravity, terrain surface and wind direction. Still I do like this engine.
 

Mike St

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Messages
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I beg to differ. Take a look at the video I posted of the same
engine with a friction drive clocked at 41.2 mph. On a flat
surface. I believe I used 11,000 rpm for my calculation.
 

Sidewinder Jerry

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I saw the video, now put a man on that same bike who's around a 100 lbs heavier and see if the speed is the same. What I'm saying is if at 7500 rpm on 26" wheels with a 20:1 reduction a 140 lbs man is doing 29 mph even though the hp may've deminished as low as 1 hp at 10,700 rpm it's still enough hp to propel him to 41 mph on level smooth paved ground with no wind. Now put a 240 lbs man on that same bike under the same conditions and the load will be so great that it probably won't go much past 8500 rpm.
 

DAMIEN1307

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Don't know what you're talking about. The engine bolts right up to the
5:1 gearbox. All that is necessary is the engine with clutch and the
gearbox. It's really no different than a friction drive where the
friction drive bolts directly against the motor, just like in my pics..
Ok...My bad...I get that, now how much is the rest gonna cost someone, the gear box etc. and anything else to bolt this together ???
 

Mike St

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Messages
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You're free to invent over my creation. I welcome more creative development.
The gearbox is about $20 from monster scooter parts. And you can buy
the rest from hardware stores, Menards, Home Depot,
but you will have to buy some 8mm chain and the 8mm sprockets, available
from Monster and TNC scooters, ebay, amazon. It's all readily available.
The con is it requires building the motor mounts for the motor/gearbox
and to the bicycle.
 
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