RE: will drilling holes............

Ivo /
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<HTML>Yes, ofcourse the carburation will change when you drill holes in the airfilterhousing. And so you should always recalibrate the carburettor when you change anything about the airfilter, carburettor, cylinder or exhaust. With bigger holes and a correctly calibrated carb the moped will go faster than with small holes and a correctly calibrated carb.

Power outage is all about the ease of the airflow, a bigger hole in the airfilter housing will increase the airflow capacity. Other things that increase the airflow are a bigger carb, bigger ports and an exhaust with a larger diameter.

Calibrating the carburettor is all about the right jetsize. A jet costs about $2 so it's no big deal.

My advise is to drill bigger holes in the airfilter housing, run the engin for a bit but don't let it get too hot. Look at the color of the sparkplug, it should be coffee-brownish (no milk). If the color of the plug is too light the mixture is too lean and you need to install a bigger jet. If the color is too dark the mixture is too rich and you need to install a smaller jet. The jetsize is stamped into the jet (not always readable) and can be anything between 30 and 90. The standard size for the Vespa Ciao and Piaggio is 38, but most mopeds need a 42, my ciao needs a 47 to run good so there's no telling wich jet is the one you need, you'll have to find out by looking at the sparkplug.</HTML>

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  will drilling holes............Topic by: Josh Josh 06/22/00 08:23PM
  RE: will drilling holes............Re: Ivo Ivo 06/23/00 12:29PM
  RE: will drilling holes............Re: todd todd 06/23/00 04:47PM
  RE: will drilling holes............Re: Ivo Ivo 06/23/00 07:54PM

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