TY 250S Mono Pinging

[badbowie]

Hi Guys,

I was wondering if anyone has any answers for stopping the pinging or minimising it on my TY250. The motor is fresh and unmodified but it pings it head off.
I beleive the original pistons had dishes in the crown ( I could be wrong) but my piston is flat.
I'm using 95 octane fuel mixed at 50:1. I have tried raising the needle which improved it a little but its still doing it.
I know some peoples answer will be to run it on Avgas but this is really not an option I want to do, as it is road registered and I fill it up at the servo sometimes.
I have heard that removing the head gasket to reduce the amount of squish greatly reduces the pinging has anyone who has done this, able to back this theory up?
Or any other ideas would be greatly appreciated

Thanks

[David Lahey]

Here is a link to a website for mods done to the TY350, which typically suffered with the same issues as you are witnessing.

http://myweb.cableone.net/bcanderson/Mods.htm

David

[badbowie]

David,

Thanks for the link.

It agrees with what i have heard about removing the head gasket to minimise the squish.
I have just had a late model gas gas carby been made available to me, so I might try to give that a go before cutting away the slide on the original carby