Text only | Text with Images

2 STROKE WORLD .net

The 2-Stroke Garage => Turning Wrenches => Topic started by: old-too-smoker on April 17, 2021, 08:28:08 PM

Title: Timing recommendations for 1979 Yamaha RD400F Daytona
Post by: old-too-smoker on April 17, 2021, 08:28:08 PM
Hello gentlemen,

Timing recommendations for 1979 Yamaha RD400F Daytona?
Yamaha specs 2.4 mm BTDC for a stock bike. I have one with spec II chambers, VM28, and K&N y-boot. Its been recommended 1.9 mm BTDC? What is your modified RD400F at?
Title: Re: Timing recommendations for 1979 Yamaha RD400F Daytona
Post by: SoCal250 on April 17, 2021, 10:53:38 PM
Mine is at 2.0 (and I run 91 Super)
Title: Re: Timing recommendations for 1979 Yamaha RD400F Daytona
Post by: bitzz on April 18, 2021, 09:21:20 AM
The stock timing of 2.4 was for 1979 gas.
2021 gas is much better and I aim for 32-34 degrees, which in a hemi head gets you maximum cylinder pressure around 15 degrees after
Text only | Text with Images