Scooterotica

I am just about to give up with this.

I have fitted a 26mm Dellorto to my 125 / 175 Rayspeed engine. Carb jetted by M.B.D. & Ram Filter fitted. Bike starts fine, will sit ticking over for an hour no problem, but she is smoky and spitting black crap out of the tail can. I drained the gear box oil with the bike running and the revs didn't change at all as the oil drained out. The bike is revving fine, and setting down again no problem. I have started the bike again and let it sit ticking over with no gear box oil in it and it is still smoky and spitting out black oil. The spark plug is pure black. I have tried 3 different heat ratings of spark plugs, and lowered the idle jet.


Any ideas ?

How long has it been in tick over after you took the gear box oil out?

i think it´s the driveside seal and it´s still sputting out black oil and smoking because there´s left much of it in the barrel and the exhaust.

Have you riden it or just had it ticking over ?

It has been sitting for an hour with no gear box oil in it. i drained out just under a half litre of gear box oil.


I did ride it for about 4 or 5 miles before i changed the pilot jet & it was still the same. It was running well beyond 1/4 throttle hence changing the idle jet.

It will only be gear oil if it absolutely stinks, sounds to me like you are running it on to high a % of 2 stroke oil. I would run it on a b8es plug at 3% oil mix and STD 95 octane fuel and the plug will start to colour properly after riding.

It has been sitting for an hour with no gear box oil in it. i drained out just under a half litre of gear box oil.

Sorry I should have said that it was ticking over for an hour with no gear box oil in it.

It will only be gear oil if it absolutely stinks so does it? If not It is too much two stroke oil.

Try what Mark says and also take the filter off.

your carb is set up too rich .it could well be the needle that needs altering seen it on me brothers chop very black oily baffle and i meen oil everywhere ,wet black plug smoked like hell ,ate plugs like nobodys business .moved the clip on the needle up everythinge fine then .just try it to see what happens .

Is it 6v or 12V if 12V did you set it up proper....by proper I mean did you strobe it? You would know if it was gear oil it feckin stinks.....just a thought with the jet black plug