How to tune 4.6 purple nitro engine?

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oobuck

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15
Ok I have the 4.6 purple motor on my savage what is the best way to tune it?
Do I need to warm truck up before I do anything else to it ? What screws on carb do you turn and in ehat order do you change things as of right now I have it hard to start and won't stay running it ran better when it was breaking in the engine
 
Sounds as if you have it too lean, go back to breakin settings and start again, think of the high speed and low speed needles as a clock face and make small 1 hour adjustments at a time staring with the high speed needle in the long brass barrel.....

and yes always always warm the engine to operating temp before adjusting anything.....
you can usually leave the low end needle alone for the most part and focus on the high speed needle.

Read through these threads, it explains what each adjustment on the carburetor is and what order to tune in...

https://www.hpisavageforum.com/threads/list-of-useful-nitro-engine-threads.13941/
 

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