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Duncan mid range +4 or no?


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Got a shee with Duncan mid range motor. 
seller told me to run 50/50 race gas and 91. 
bike set up for glamis. 
 

called Duncan and I was told to run 110 or higher, not mix. I asked about going +4 on timing and was told with ther port job that it’s not necessary. 
 

1. should I go +4? Got a adjustable plate and a lightened flywheel(not installed yet) 

2. race gas or mix? 
 

3. Duncan’s “instructions” for the mid range motor is too run b9es plugs, I have always ran b8es. Why b9? 

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  • 3 weeks later...

Congrats on that motor! How did you get ahold of it? For those who did not know, that is the motor Doug Eichner raced and WON many pro and pro-am MX races with in the 90's with ZERO DNFs. It is also the motor still being run by most of the banshees competing in the Point de Vaux. 

 

https://dirtwheelsmag.com/hot-rod-banshees-mx-tt-quads/

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3 hours ago, DDQ said:

Congrats on that motor! How did you get ahold of it? For those who did not know, that is the motor Doug Eichner raced and WON many pro and pro-am MX races with in the 90's with ZERO DNFs. It is also the motor still being run by most of the banshees competing in the Point de Vaux. 

 

https://dirtwheelsmag.com/hot-rod-banshees-mx-tt-quads/

Hp2000

im very happy with it!!!

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Hp2000
im very happy with it!!!
Hold on to it. I have worked with surfrjag to try to get my motor as close to a Duncan mid range motor as possible. It would be cool to dyno both motors on the same dyno one day.

Sent from my SM-G975U using Tapatalk

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