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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