Removing Stock Airbox By scootinzane (Read 9,285 times)

[scootinzane]

So on a 150cc gy6 there are a few hoses attached to the stock airbox. Once I take off the stock airbox for a performance UNI filter along w/ 30mm carb what/where should be done w/ the hoses that went to the stock airbox?

If there is a writeup on this already sorry, i'm a newbie.

[sprocket]

There is little or no 'performance' in an UNI filter and a larger carb will cause you a ton of trouble...

If you go with a UNI of K&N make certain to oil them with the correct oil...the foam filters nothing, it is the oil that does the filtering...

Stick a fuel filter in the end of the valve cover vent and zip tie it high upon the frame...

[Alleyoop]

The 150s come with a 24mm carb and that is plenty for the engine. If you put on a Free Flow Filter like a K&N or UNI you can try raising the Diaphgram needle and if that is NOT enough fuel to match the Free Flow Filter then you can just put in a bigger Main Jet like a 112 or 115.

The 30mm Carb will Flood the crap out of it.
Alleyoop

[cdoublejj]

So i guess the 24mm carb i bought for my 139qmb won't even run? i bought it used from an ebay seller who had it on their 50cc, i cam back through the scooters forums looking fora particular thread with a similar issue i'm having during install witch are the extra hoses since the new carb a 24mm run tong carb uses vacuum.

[sprocket]

Yup you need a vacuum line to the de-accelerator valve on the throttle side.. won't work without it...

Bigger carb bigger headaches...why bother... it won't go faster...

[cdoublejj]

i got an A9 cam and cdi and carb hoping to give it more pep then i was gonna go over to the trans for top speeds, when ALL said and done i wanted perf head a 60cc jug a trans kit and bigger carb. thanks for the note on the carb i'm gonna see if i can't finnish hooking it up.

So if non of this will give it more power or make it go fast what does other than rollers witch i think is a load i think after market variator and rollers would help but, only with more power? Can you at least give me a low down?

also the thing your speaking of on the carb is built in to the side of the throttle body not the pump up top under the alloy cover right?

[Alleyoop]

Here is the ACV Diaphgram that needs vacumm.
Alleyoop

[cdoublejj]

yup that's how i have it it's getting spark but, not running i'll try the stock again some other day i'm kinda wore out and feel cheated and let down. having learned non of it really adds any power. i left ebay seller a message apparently he had with a 100cc bore kit but, was too retarded to mention so also he isn't the only one some people not on ebay are selling the 24s as oem replacements. also sometime during the tear down last night the little clip in the spark plug holder fell out so it doesn't "click" when you slide it on witch isn't helping things.

I feel kinda bummed out today nothing really worked or went the way it should have.

EDIT i also put a cam in we checked TDC of the crank and cam so i really hope thats not the problem boy would that be a PITA

[sprocket]

'There is no replacement for displacement... ' BBK or nothing...

Sure you can tweak an engine with cams and carbs but it won't do much to the top speed...it may increase the horse power and shift the power curve a bit.. you may get 3-5 mph more but I doubt any more...

Don't believe the after market 'performance hype'

[cdoublejj]

oh well then in that case a 60cc with a perf. head would help, infact probably a little more than that small boost i was looking for. Pistons make big difference too and so do heads. I had and still have 4hp Tecumseh yeah old school man American mini bike type Tecumseh.

i spent hours trying to get it to run finally my dad and i tracked it down to that valve seats. So we gave it a slight port job and and lapped the valves, i also built the carb out of hand full incomplete carbs and even did little drilling on the air horn. finally got it running and rather healthy at that. At some point I got in contact with long time machinist friend who milled the head 40 thousandths, that with all the other mods made a BIG difference.

my machinist friend said that I would be surprised what you can to and engine with pure machining and metal work. Now I'm not so surprised i bet i could go back and do even more thing to that engine like lighten the fly wheel witch is one mod i know i'd like to do to my scoot.

sure 3 three small mods won't make big difference but after a while the mods will add together if keep adding them on so to speak. you know in the 1960's companies like Honda had 2 stroke twin cylinder 50cc 16 speed race bikes that had some serious top end, of course that was all in the engineering not mods but, boy it sure does make you think and wonder.

Any who big inspirational speech aside I actually need to get mine running first. I'd like to see if it's fuel issue by spraying something in the carb and see if it fires. Also on a side note how do i know what weight my stock variator weights are?

[sprocket]

Your rollers could be marked or you need to weigh them.. try the post office...or a pharmacy

[cdoublejj]

well it got it all back together and going turns out one of the pins on the CDI plug had back out so i got my spark back. also put the stock carb back on but, left the A9 cam and CDI in it runs 10 mph slower doesn't want to start or idle and runs hell fast on a big down hill and like crap on the on hills and flats. I thought i might start by checking for an intake leak thought i might spray some sealer on the intake gasket and see if that makes difference.

[sprocket]

You need to check the cam at TDC. You may be one cam chain link out.. having replaced the cam...

[cdoublejj]

i really hope it isn't that, i remember double and tipple checking 2 small holes in line the with the head and the big straight out all while the TDC to the T on the fly wheel. if it's honestly not something simple i'd rather wait till I get a BBK to mess with it. speaking of witch does any one know of a quite performance pipe? i was thinking of welding on a bigger header to the stock pipe.

[sprocket]

Are you certain the cam chain is on the bottom sprocket on the cam? They can come off and sit on one side of the cam sprocket on the crank...I have seen engines run like that...

How is the cam chain tensioner?