piaggio zip stage 6

Hi all, just like to ask the question on my 2003 piaggio zip 50cc. and that is ive just bought a stage 6 pro replica chrome exhaust. the rest of the bike is standard at the mo as times are hard, what is the best way to tune this exhaust as ive fitted this ok and have had her ticking over but when I give her some throttle she dies at top end (when i open the throttle all the way). would this mean that there is not enough fuel getting through or is there something completely differant....?
your help would be much appriciated.. :beg:

 

thanks for the info, ive bought some jets from 60 to 80 in a pack and a set of 4.5 gram rollers, not sure what type of clutch springs though. ive heard the blue ones are best but is it better me buying a set of differant types or just buy one set.

its only being run in me garage at the mo while I set it up so not been on the road yet till thats done.
ive also just blead the oil pump but it seems to take an age to get from the pump to the carb while its ticking over as I cleaned the tubes out originally. ive put some premix in the fuel tank for now but is that the norm or is my pump nacked...?

 

cheers fella, box of springs it is then :grin: . I take it once all these bits fitted its a case of suck and see till i get it right. ive found some good read on here too about tuning so will have to spend a bit of time getting an idea first. will let ya know how I get on ..

 

ok, ive got the stage 6 exhaust on and ive put in 4.5 gram rollers from standard and ive upjetted the the standard carb from 56 main jet to 66main jet. ive also added a after market air filter and she starts firts time on the button. great you say, well not entirly as when I open the throttle up to just pull away you have to open it a bit more as in nearly all the way and she then just dies on me. have I upjetted her to much im thinking or have I put in to lighter weight rollers. ive not touched the clutch at this stage. I was thinking of changing the clutch main spring (the one in the middle but thought Id ask for advice first. cratch:

this is a standard 50cc btw.

 

thanks m8 will try anything once. do you think the rollers are to light think the standard ones are 7s or 8s will have to weigh them...?

 

ive not changed the clutch springs as of yet, would that make a differance. or do you mean the big spring in the middle.
well ive uped the idle slightly and reduced the air screw (think standard is 1 1/2 turns and when i go to pull away you have to open throttle more so to get going and its full throttle and then she dies almost as if i shut her off I can still keep idle.
is it worth checking my compresson and if so does anyone know what the norm is.

 

im thinking maybe ive upjetted it to much going from 56 to 66 main jet. im going back to basics and putting in the 56 to start with and checking from the fuel tank making sure there is a good flow to carb and see what happens and go from there. will report me finding once all is ok fingers crossed.

 

jez, that means im well off the mark. thought it was 56 as I bought the carb from a second hand shop.
ive tried a 60 but she still keeps boggin down when i open here up. the only other thing ive done is when i put my hand over the carb inlet she does,nt bog down. the other thing is ive replaced the head gasket cos it never had one and my compression has droped slightly from 60 psi before and is now 52 psi. im saying all this as im wondering if im losing compression inside or am I totally on the wrong track. ive even checked the reeds with a light and they were slightly open on one side and ive striped them and put back and are all ok. any ideas guys.

 

checked for leaks using wd40 and no change in engine note or bubbling around areas checked. its only done just over 7ooo k but when i looked at the barrel and piston they where scratched down the sides so used some light sand paper to clean them up. I was told if they were scored just a light clean up would be ok. ive also replaced the plug today but no joy and the plug was wet when i pulled it out.

 

hii yea i had the same problem when i fitted my stage 6 exhaust, i tryed 5.5gram rollers with a 68 jet and polini airfilter at it wouldnt get over 10mph so i took the airfilter out and put origonal one back in and it did about 25 flat out and atm ive got the 5.5gram mallossi rollers in with origional main jet 56 i think it is and i can do about 60ish on flat on a long road and about 70ish down hills but somedays i can barely get over 40 any ideas ?

 

nah i was useing the stock one and dunno got clocked by mates car doing it and i was thinkng bout buying the 4.5grm rollers tonigt then fitting them after work on monday or tues recon that would work better ?