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How true are Rotax Max Jetting Selecton Charts???
Posted by 'Dazz' on 22 May 2012 @ 22:31


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Dazz
Joined: May 2006
Total Posts: 1
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Hello

I have been racing KT100s for a while and have just crossed over to the Rotax Max. I don’t know much about these engines so I read all the stuff about jet settings. I brought a weather station for use at the track and took a copy of the jetting chart along.

Before my first practice run the conditions were 2degC, no rain and 980mBar which equates to a 172 jet on the jetting chart. Just to be sure, I compared notes with other drivers who simply laughed at me. They were running 160-162 jets and said that 172 was way too rich. I ran a 165 jet the whole day.

Throughout the day the plug colour was good, performance was good and I was getting 2nd fastest lap times behind an A grade driver who’s been racing Rotax forever (I am C grade). I am 10kG over MAW and raced tyres 7 meetings old.
The temp increased to 12degC which should equate to a smaller jet size. There was no obvious change in plug colour or performance.

How “true” are the jetting charts? Does anyone follow them or are they just a starting point?

Dazz

Message Thread:

How true are Rotax Max Jetting Selecton Charts???  by 'Dazz'  << You are here!
Re: How true are Rotax Max Jetting Selecton Charts  by 'John'   (22 May 2012 @ 22:40)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Ditch'   (23 May 2012 @ 4:43)
Re: How true are Rotax Max Jetting Selecton Charts  by 'PaulMRotax'   (23 May 2012 @ 7:45)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Ditch'   (23 May 2012 @ 9:10)
Re: How true are Rotax Max Jetting Selecton Charts  by 'itpro'   (23 May 2012 @ 13:27)
Re: How true are Rotax Max Jetting Selecton Charts  by 'PaulMRotax'   (23 May 2012 @ 14:13)
Re: How true are Rotax Max Jetting Selecton Charts  by 'John'   (23 May 2012 @ 15:40)
Re: How true are Rotax Max Jetting Selecton Charts  by 'PaulMRotax'   (23 May 2012 @ 15:54)
Re: How true are Rotax Max Jetting Selecton Charts  by 'itpro'   (23 May 2012 @ 17:03)
Re: How true are Rotax Max Jetting Selecton Charts  by 'NJB'   (24 May 2012 @ 12:31)
Re: How true are Rotax Max Jetting Selecton Charts  by 'itpro'   (24 May 2012 @ 13:00)
Re: How true are Rotax Max Jetting Selecton Charts  by 'RocketMan46'   (23 May 2012 @ 15:52)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Hootsman'   (23 May 2012 @ 20:32)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Dazz'   (23 May 2012 @ 21:19)
Re: How true are Rotax Max Jetting Selecton Charts  by 'fatboynobby'   (23 May 2012 @ 21:30)
Re: How true are Rotax Max Jetting Selecton Charts  by 'John'   (23 May 2012 @ 22:22)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Dazz'   (25 May 2012 @ 5:08)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Bob'   (24 May 2012 @ 7:35)
Re: How true are Rotax Max Jetting Selecton Charts  by 'MaxMat'   (24 May 2012 @ 9:07)
Re: How true are Rotax Max Jetting Selecton Charts  by 'MikeSimpsonsnr'   (24 May 2012 @ 13:38)
Re: How true are Rotax Max Jetting Selecton Charts  by 'BanzaiBoy'   (24 May 2012 @ 14:02)
Re: How true are Rotax Max Jetting Selecton Charts  by 'MikeSimpsonsnr'   (24 May 2012 @ 21:08)
Re: How true are Rotax Max Jetting Selecton Charts  by 'John'   (24 May 2012 @ 21:28)
Re: How true are Rotax Max Jetting Selecton Charts  by 'BanzaiBoy'   (25 May 2012 @ 0:29)
Re: How true are Rotax Max Jetting Selecton Charts  by 'MikeSimpsonsnr'   (25 May 2012 @ 11:39)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Dazz'   (25 May 2012 @ 11:45)
Re: How true are Rotax Max Jetting Selecton Charts  by 'd-i-y71'   (25 May 2012 @ 13:15)
Re: How true are Rotax Max Jetting Selecton Charts  by 'John'   (25 May 2012 @ 13:17)
Re: How true are Rotax Max Jetting Selecton Charts  by 'd-i-y71'   (25 May 2012 @ 13:59)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Andy99'   (25 May 2012 @ 15:04)
Re: How true are Rotax Max Jetting Selecton Charts  by 'd-i-y71'   (26 May 2012 @ 20:45)
Re: How true are Rotax Max Jetting Selecton Charts  by 'John'   (26 May 2012 @ 22:10)
Re: How true are Rotax Max Jetting Selecton Charts  by 'itpro'   (27 May 2012 @ 1:43)
Re: How true are Rotax Max Jetting Selecton Charts  by 'John'   (27 May 2012 @ 6:46)
Re: How true are Rotax Max Jetting Selecton Charts  by 'itpro'   (27 May 2012 @ 19:19)
Re: How true are Rotax Max Jetting Selecton Charts  by 'd-i-y71'   (27 May 2012 @ 20:47)
Re: How true are Rotax Max Jetting Selecton Charts  by 'itpro'   (28 May 2012 @ 0:15)
Re: How true are Rotax Max Jetting Selecton Charts  by 'PaulMRotax'   (28 May 2012 @ 11:14)
Re: How true are Rotax Max Jetting Selecton Charts  by 'itpro'   (28 May 2012 @ 11:42)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Andy99'   (28 May 2012 @ 12:32)
Re: How true are Rotax Max Jetting Selecton Charts  by 'PaulMRotax'   (28 May 2012 @ 14:05)
Re: How true are Rotax Max Jetting Selecton Charts  by 'itpro'   (29 May 2012 @ 1:00)
Re: How true are Rotax Max Jetting Selecton Charts  by 'PaulMRotax'   (29 May 2012 @ 7:43)
Re: How true are Rotax Max Jetting Selecton Charts  by 'itpro'   (29 May 2012 @ 15:44)
Re: How true are Rotax Max Jetting Selecton Charts  by 'PaulMRotax'   (29 May 2012 @ 16:32)
you do not need to know any of the above...  by 'NJB'   (28 May 2012 @ 21:06)
Re: How true are Rotax Max Jetting Selecton Charts  by 'd-i-y71'   (28 May 2012 @ 12:03)
Re: How true are Rotax Max Jetting Selecton Charts  by 'John'   (28 May 2012 @ 12:27)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Hootsman'   (29 May 2012 @ 16:08)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Dazz'   (30 May 2012 @ 7:29)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Danlee'   (30 May 2012 @ 11:16)
Re: How true are Rotax Max Jetting Selecton Charts  by 'NJB'   (30 May 2012 @ 17:22)
Re: How true are Rotax Max Jetting Selecton Charts  by 'Dazz'   (31 May 2012 @ 8:12)

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