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Title: 40idf jetting on 69x88 motor Post by: axam48ida on June 23, 2007, 05:45:56 am any suggestions on jetting of a small displacement motor with 40 idf's
motor has a very mild cam, lightly ported heads It's not popping or coughing....just lags on low end from intial start I have F7 emulsion tubes, 115 mains, 160 air and 45 idle mid range and top end seem fine Title: Re: 40idf jetting on 69x88 motor Post by: Rasser on June 23, 2007, 11:41:43 am Your vents plays a big role in jetting... what size are you running ?
Title: Re: 40idf jetting on 69x88 motor Post by: axam48ida on June 23, 2007, 18:53:54 pm 28 vents
Title: Re: 40idf jetting on 69x88 motor Post by: alex d on June 23, 2007, 21:28:51 pm I'd try larger idles
Title: Re: 40idf jetting on 69x88 motor Post by: nicolas on June 24, 2007, 16:13:06 pm i run 28 vents in my 1641
and i have 115 or 120 mains and 190 air and idle jets are 50 if i am correct. not sure at the moment what tubes i have... Title: Re: 40idf jetting on 69x88 motor Post by: Rasser on June 24, 2007, 18:05:11 pm Sounds like you´re sizes aren´t completely wrong.
But i too would try 50 idles or 55, and adjust the floatheight and acceleratorpump. How about synchronization - is it spot on ? |