PB JUST WONT GO... PLEASE HELP !! WONT GO OVER 4000RPM

Hey, i got a pb for xmas and 48km just wasnt quick enough, so i took it to the pb pro shop and fitted, racing exhaust, race carbi, front and rear gears, new clutch and a new spark plug, after these mods it was hammaring, after 20 min of use the was just gutless, really wants to get up and go on take off but then loses it when opening the throttle, i have since had it in pieces and everyting is still is perfect condition and it also has the pro shop thinking... anyone had similiar problems or can suggest anything it would be greatly appreciated

u might have to adjust the carby

becase the carby might have been set right for braking the motor in

did u have a new head put on it?


u might have to adjust the carby

the same thing happend to my cag

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Nothings cooler then watercooled
stock cag: going hard
banshee: going harder
pro cag: not going (will be soon)

creator of the:
UCC (ulitimite cag clutch)
aussie Twin cag motor
and other crazy stuff

what kind of bike is it? is it of ebay?

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Hey mate, yeh the pb is off ebay, but i have done heaps of mods to it i wouldnt say its the same bike, the think that gets to me is that it was flying and now doesnt want to go. feels like is not getting enough fuel or air, but carbi is at is full protential... any suggestions?

What sort of carbi u got on her? is it blocked maybe it needs cleaning out

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49cc F7, sleeper head, fully polished internals, reed, timing key, modded carb=speed

hey mate, not sure of the type of carbi but its 2 days old from shop, carbi is clean as, its really got me ....ed, its just doesnt want to get up and go, sound like its struggleing for fuel or air but carbi is tuned and getting heaps of fuel and air. thing is.. it was hammering and now doesnt want to go which led me to gaskets, but they are fine... any other suggestions?

mooks, is your fuel tank clean inside? have you replaced the stock fuel filter and also the fuel line? i would check and replace these firstly as this may be your problem.

:idea: Is it hard to start as well? If u already have'nt , u should realy change your standerd cheap crapy spark plug,they dont last too long & they r not made for high reving beasts like yours!.Get a hoter high preformace plug like NGK with an 8 rating.They should be pre gaped,ready to put in & kick her in the gutts.
Good luck
Jace(syd)

Maybe 20 minutes of hard racing to too long for it. A/C bikes will loose performance if run too long and get too hot.

Does it go Ok when first started, ie, cold, or is only after it gets hot.?

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U R never 2 old 2 race

''Maybe 20 minutes of hard racing to too long for it. A/C bikes will loose performance if run too long and get too hot. ''

It would still rev fine if it overheated, it just wouldnt have any decent power.

I agree with the other people, make sure the fuel tank-fuel line and filter are clean.

What colour is the spark plug? if its the stock one get a NGK or similar plug.

Take off the air filter, start it on the stand and see if it revs out fine. If it revs out, clean the air filter and re-install (DONT ride it without the filter!!)

Do you have a picture of the carburettor or bike? it may have gone out of tune if it has mixture screws/