PVL Timing

[2T]

Hi all,

I am about to replace my OEM ignition system with an analogue PVL system on an air-cooled 500cc motocrosser (Yamaha WR500).

PVL recommend timing start at 2.2-2.4mm BTDC for open class machines, however standard OEM setting for my bike is 1.7mm BTDC.

Should I set to OEM or PVL measurements?

[pokey]

Suck it and see. Gazetted settings are good for a starting point though i bet your final settings will  have a few adjustments from both those numbers.
You know the process. Choose either , id start with 2.4BTC and give the bike a few runs then try the stock settings with small incremental changes either way to see what the bike likes. Every engine is different and every rider wants something different. Plug chops.

[2T]

Thanks for the help pokey.

The bike gets a lot of WOT/high RPM and am a bit concerned about detonation and overheating if going higher than OEM setting.

[PeterC]

Pokey is on the money. The different systems and manufacturers of aftremarket ignitions have different advance and retard values. Some have user programmable advanve/ retard curves. I suggest a softly/softly approach with the testing.

[skypig]

I love this Forum. 

[John Orchard]

I love this Forum. 

Me too, I don't know why more people don't contribute with either questions or answers.

[2T]

I love this Forum. 

Me too, I don't know why more people don't contribute with either questions or answers.

It's a shame forums are not as popular as they once were. The good ones have been such a great source of accurate information that's not available elsewhere.