Unleaded conversion

[beno9962]

Does anyone know how much it would typically cost to have hardened valve seats installed on a 948cc head?

Also if I were to run on unleaded, would I have to adjust tappets, timings etc and is there a particular level of octane required for this engine?

[mike.perry]

Normal practice is to exchange heads

[lambrettalad]

waiting for Bmc..............

[beero]

I agree with BMC , unneccessary expense.
(Sorry, did I jump the gun? Has he not posted yet??)

[Alex'n'Ane]

I agree with BMC , unneccessary expense.
(Sorry, did I jump the gun? Has he not posted yet??)

I thought it was a pretty unanimous agreement that if having to fit new valves, you may as well go for unleaded...? But untill it fails, leave it.

[beero]

I suppose so, depends, I only had to renew the exhaust valves so in my case 4 new valves and a lot of lapping was a lot cheaper.

[bmcecosse]

Exactly - don't bother! Set exhaust valve gaps at 15 thou and check/reset every 3000 miles. For a 948 - may as well keep an eye open for a later 998 Mini head - which is supposedly 'unleaded' - but in fact just has better quality exhaust valves - may as well have that head though - but don't pay more than a few pounds - sometimes 998 engines are given away free......