LCGB Forums

Looked at my plug for the first time in ages today, not being an expert in plug colour and diagnosis, all comments and advice welcome.
Feel free to add to the thread with your own plug pictures for diagnosis

Lambretta 150 Special
Engine: Standard 150cc ( 4th oversize at 57.8)
Carb: Standard SH1 18 – but with main jet 106 (opposed to 101 which was standard)
Plug: NGK B8ES
Exhaust: KBA clubman
Oil: Putoline classic scooter-x, 100% synthetic
Oil ratio: 3%

At what throttle position did you kill the engine? Or was it on stand with engine ticking over?

I'd say on the face of it the mixture is ok but appears to be burning gearbox oil as your fuel/ oil mix is not too rich but the plug has oily deposits. Is the level dropping?

Paul

Fat Trucker wrote:At what throttle position did you kill the engine? Or was it on stand with engine ticking over?

was just after I'd taken it for a run, let it idle on the stand before switching off....

Scooter Paul wrote:I'd say on the face of it the mixture is ok but appears to be burning gearbox oil as your fuel/ oil mix is not too rich but the plug has oily deposits. Is the level dropping?

Paul

Just changed the gearbox oil and everything seemed to be ok