The exhaust restictor is pretty obvious. If you don't see it about 20cm down from where the exhaust comes out of the engine then it doesn't have one. Here in the US, the GP1 is sold as a moped, and therefore have all kinds of restrictors on them to slow them down. In Canada, it is probably sold as a scooter.
For the Dellorto Carb tuning guide, go to http://www.ducatimeccanica.com/dellorto_guide/dellorto.html
I will email you directly for the links to other carb tuning sites that I've found. I think the Dellorto one above is one of the best.--vh286.
> Thank you very much for your advise. However I still don't
> understand where this cut off restrictor pipe is. Is it ONE
> the exhaust/muffler itself? Becuase I don't see any thing
> cut off from it and there is only ONE main pipe that I bolt
> onto the engine. Or is this restrictor something that's
> under the engine on the scooter itself? Where should I look
> for this?
>
> The website www.dellorto.com doesn't work. Is the name
> correct?
>
> Please advise
> thank you
> Kendrick
>
> My email is kw_ap1@hotmail.com perhaps you can email me
> directly. Thank you
>
> > Based on the speed you have gone so far, the restrictors
> > have been removed. Check your exhaust for any kind of
> leak.
> > One of the restrictors was a piece of tubing that was
> > blocked off on one end that was connected to the exhaust
> > pipe right where the exhaust pipe bends out from under
> the
> > engine. It is removed by cutting it off and welding up
> the
> > hole. There might be a leak there if it isn't welded
> > properly.
> > The jets are located inside the carb. If your bike is
> > stock, the jetting should be correct. How does the
> engine
> > idle? If you want to know what the inside of the carb
> looks
> > like and where the jets are located, log on to
> > www.dellorto.com and click on Motorcycle Carburetors.
> Look
> > for the PHVA carb and click on that. There you will find
> > the exploded view of the carb. The stock jets on the GP1
> > are a #62 main, and #32 idle. For more info on jetting,
> do
> > a Web search on motorcycle carb tuning. There are a lot
> of
> > articles that detail the process. The only external carb
> > adjustments are the idle speed, and air bleed
> > screws.--vh286
>
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