need help roketa bash mc17 150cc engine changed By jlrod09 (Read 6,230 times)

[jlrod09]

on the old engine that belonged to the roketa bash i noticed that the woodruff key was alot bigger than normal is that a good thing what is the keys purpose

[jlrod09]

by straigh flow exhaust you mean the ones that are called racing exhaust .

[alleyoop]

First question:
Woodruff key are you talking about the key on the crankshaft that holds the Flywheel? IF so that is to hold the FLYWHEEL in the correct position so it does not rotate on the shaft.

As far as Free Flow Exhaust they call them Performance Exhaust, most are straight through meaning there are no baffles in them to quiet them down. The exahust goes out faster which makes the motor run leaner that is why you need more fuel also a performance exhaust will be louder.
Alleyoop

[jlrod09]

yes that is what im talking about . that little wedge looking like thing called the woodruff key

and a free flowing intake would br anthing aftermanrket , ipresume . thanks again .

[alleyoop]

HAHAHA!!, Well yes they will advertise them as performance exhaust and tell you, you will get more power and go 900mph and a lot of BULL SHIT like that. But don't believe it with just the free flow exhaust you will THINK you are going fastet DUE TO THE NOISE it makes

You also need a Free Flow Filter to get more air to go along with the Free Flow Exhaust and then you have to RE-JET your carb to feed it more fuel. So its not as easy as it sounds, also you have to get one that will MOUNT onto your scoot without modifications. A lot of them require some kind of modification to put them on.

JlRod, QUESTION: what are you looking for out of your scoot, more top end speed, strong exceleration, climbing hills etc...
Alleyoop

[jlrod09]

im looking to get more power out of it basicly a balanced attack take off + speed

[jlrod09]

yes they do really know how to target theyre sheep

[jlrod09]

im not really looking to make noise but if a free flow exhaust is needed . i will do it . im not looking to go brake my pockets either times are tough .

[jlrod09]

would and oil cooler help the engine at all , will it have any affect in performance

[alleyoop]

Oil Cooler just keeps it running a little cooler but nothing for more power or performance. Motors do not like heat but 99.9 percent of the scoots out there do not have an OIL COOLER
So with that said you can do better for that amount of money spent for what you want. Let me ask do you know what engine is in there? Is it a GY6? They usually have the engine imprinted on the Motor Case left side near the CVT cover.
For less money you can get a performance Variator and weights to get more exceleration and a little more top end speed for starters.
Alleyoop

[jlrod09]

its a 157qmj a gy6 the motor for scoots with 16 inch wheels

[alleyoop]

COOL!! That is the same motor that is on mine. So you can get a 115mm Variator and play with the weights and get some added top end on it. Also a performance CDI which has advanced timeing gives you a little more power.
Alleyoop

[jlrod09]

should i get a DC or AC cdi .

[jlrod09]

how would i be able to tell if i have a smaller variator/fan .

[jlrod09]

im actually looking for body parts for my pegasus