Engine Trouble best engine 50~80cc

[2smokebiker]

Just wondering if the ktm gp50r on thatsdax.com is a good engine and a good buy? It's about 500$ but comes with the carb which I think is a 21mm D-slide. What is over ppls take on it? Thanks

 

[Deleted member 12676]

If it's designed to deliver only high RPM power and its only one speed then don't get it.
One speed bikes need a broad powerband.
Hopefully someone that has one can tell us what it is like.

 

[MotorBicycleRacing]

Just wondering if the ktm gp50r on thatsdax.com is a good engine and a good buy? It's about 500$ but comes with the carb which I think is a 21mm D-slide. What is over ppls take on it? Thanks

Save Save yourself $200 by buying it direct from China.

Only $301
http://www.aliexpress.com/store/product/KTM50-AIR-ENGINE/602744_627840002.html


Developed from KTM50 Senior Adventure bike's engine---
1) Engine type: single-cylinder, 2-stroke, air-cooled
2) Piston displacement: 49cc
3) Bore x stroke: 39.5 x 40 mm
4) Max. power: 9HP/9500RPM
5) Max. torque: 7NM/11000RPM
6) Compression ratio: 11:1
7) Ignition: CDI
8) Spark plug: NGK BP7HS
9) Carburetor: diaphragm
10) Air filter: polyurethane foam(built on the KTM50 bike)
11) Start mode: KICK start
12) Clutch style: centrifugal automatic
13) Average fuel consumption: 610g/kWh
14) Dimensions: 270x220x250 mm
15) N.W/G.W: 8.4kg(with carb) /10kg
16) Packing Box: 290x285x375 mm

 

[keatonx]

Peak torque at a higher rpm than peak hp? Must be labelled wrong because that's impossible (hp=torque in ft-lbs*rpm/5252)

 

[Deleted member 12676]

9500RPM peak means it is a race engine, not made for street use.
9hp means it has peaky power, all at top RPM.
buyer beware!

 

[2smokebiker]

Ok, thanks for the warning Jaguar. And thanks for the source link, info and tip MotorBicycleRacing.

It does seem high in the rpm dept. But may still be usable, especially if it is possible to modify or somehow get more low end PWR (although I have no idea how I would do that).

It seems like the carb in the list is not the same. i.e.a diaphragm carb is not a D-slide carb.

$123 + 16 ship from UK on ebay looks same.

http://pages.ebay.com/link/?nav=item.view&id=331004689447

 

[2smokebiker]

seems like I should just get your CDI jaguar. But my engine isn't a grub it's a Skyhawk 66cc. It has a dragon on it too, I think.

 

[2smokebiker]

okay maybe this is the right carburetor?anyone else?
ttp://pages.ebay.com/motors/link/?nav=item.view&id=121138934811

 

[2smokebiker]

What happened to all my other posts?

 

[2smokebiker]

MotorBicycleRacing: Thanks and: Would the Morini engine be better? Which do you think would be lighter?