Topic: Main Jet Sizing

[snoop]

I am about to dive in to my carbs,  I understand the process very well but I dont get certain areas like jet sizing.  I hear people saying up the jet to a certain number.  Are the jets universal between bikes? Where would I get new jets that are not stock sizing?  Also how do the jet numbers work?

[BobbyR]

Well you did not mention what bike it is. Jet sizes have a 3 digit number. 105 is smaller than 120 etc. How you jet your bike depends on if you are using a stock air filter set up or you are using pods. The exhaust system has an effect, open pipes take a richer mixture than a stock system so you may go up a jet size. It is all about reading your plugs to see if you are rich or lean. I would search the forum for the "plug chop"technique" which a lot of people use for reading plugs. Jets are pretty easy to get.

[Lumbee]

http://www.crc2onlinecatalog.com/misc_carb_parts.htm for larger than stock jets...

[snoop]

I have a cb550 and cb125.  I am learning to do carb adjustments on the cb125 first because it is a single then move on to the 4 carbs.  the cb 125 has an open exhaust and has a main jet #98