Mackiebass Quiz.

He didn’t say if the plugs smelled of petrol when he took them out and assuming he’s not done anything else to the engine and it was running before I’d point at the carb. He’s got a spark and fuel into the float chamber so it would seem that the fuel isn’t getting through the carb properly. Anyone else??

 

Timing??

 

Just gone back and had another look
When he’s trying to start it after putting fuel in the tank it’s trying to back fire through the carb this is what makes me think...timing??
The spark plugs are working fine as best as I can tell .....I don’t think he needs new ones
Has he had the bike running with this carb set up? or is it something that he’s trying?

 

The Carb is su I fitted one on a triton the oil in the plunger is to heavy it should be 3 in 1 or similar and you have to give throttle to start

 

perforated carb diaphragm?

 

Doesn't have one

 

righty ho...

 

was thinking zenith carb ...........how about silt in the jet ,just an

 

Sorry for the short answer I got called out what I meant to say was it doesn't have one as it's a very old type of carb as fitted to triumph herald or v8 rovers etc.

 

You could be getting there as far as my memory goes the su only has one jet that's what made it so simple and therefore reliable if that jet was clogged it would be all through the range

 

I had this when I had the herald in the 70's, it was caused by using dirty petrol (JET),only certain cars with suitable carbs could use the 'dirty petrol'had to clean the jet with fuse wire the all was ok

 

Could be right the oil is a very important part of these carbs

 

Nice one...hope your test run goes will