jets

[cee]

Hello

can someone help me?

I am driving a vespa pk (xl1)

with a DR75 cylinderkit and a standard 16/10 carburator. the main jet at the moment is 55. the exhaust is a Tecnigas chrome banana. the airfilter is from malossi

but he doesn't drive like he has to drive.

when I drive full throttle, he doesn't go straight, he holds in, normally it drives on the speedo 70km/h but then it falls back to 60km/u, back to 70km/u, back to 60/u...

does anyone know what's the problem and which main jet I need?

greetz,

Cédric

Bearbeitet 25. März 2011 von cee

[Spiderdust]

your carb is a bit small for that cylinder. if possible use a 16.16 carb.

jetting should be between 68 and 74.

sounds also like your clutch doesn't separate fully.

[cee]

thanks for replying ;)

I should buy me a jetset from Sip scootershop :)

the problem with the clutch is also something strange... he only falls dead when i hold the clutch lever in 1ste, 2nd, 3th and 4th gear.

greetz;

Cédric

[dare]

thanks for replying ;)

I should buy me a jetset from Sip scootershop :)

the problem with the clutch is also something strange... he only falls dead when i hold the clutch lever in 1ste, 2nd, 3th and 4th gear.

greetz;

Cédric

The jetting mentioned is only for 16.16. 16.10 is a lot smaller (around 57 or something like that i guess but i really dont know).

If I get your problem right it might also not be carb-related. Sometimes its strange things like a kill-cable that gets grounded everytime you do something (move something. may be gas, shift, clutch, ...).

Does it die like when you push the kill button?

[cee]

yes, it looks like when you pull out your key.

[Paichi]

Hey there,

then it definetly looks like a short circuit. Check your electricity, especially in the control lever.

I also have a 75ccm cylinder (Dr75F1) in a V50 with a 16.10 carburator. Not the best solution, but I didn't have a 16.16 or 19.19. The mainjet is 65, the exhaust ist the "Piaggio Banana :)"

While driving, pull out the choke --> your engine should go much better. Take a bigger mainjet.

Best wishes

Bearbeitet 6. Dezember 2010 von Paichi

[cee]

Thanks mate ;)

i'm gonna order a jet set tonight at sip scootershop ;)

how fast can you drive with you're DR 75 F1?

greetz,

Cédric

[Paichi]

I have a transmission of 3,72 and 10" wheels. This makes little more than 60km/h (measured with GPS).

Best wishes