Engine only runs when I put petrol on the spark plug

[GreasyChris]

id just try starting it. with the new fuel mix you may have to rejet the carb. once its running and warmed up if it 4 storkes under acceleration it means its running rich and you need to lean out the carb. smaller number jet means lean higher number means richer. stock is usually 70

 

[GreasyChris]

one other thing is make sure the cylinder head bolts are tight. they like to loosen off.

 

[David22]

Hi I've checked all the bolts and they're all tight. I replaced the fuel with 32:1 and put petrol on the spark plug. It fired right up and drove for about 5 minutes then it stalled and refuses to start

 

[David22]

I just put more fuel on the spark plug and it started again so I drove it hard enough for 20 minutes before switching it off. Here's a video of it idling and revving. Is it making any unusual noises? I'll try start it agian once it cools down.

 

[David22]

Click this to see the engine idling and revving

 

[David22]

Just tried starting it and nothing happened. Refuses to start! Seems to only start once the engine is hot

 

[GreasyChris]

it sounds 0k. id check the float level then try again

 

[David22]

I'll do that but are you sure it isn't the spark plug struggling to start in the cold? I would I have thought if it's able to run for 20 minutes that would mean that the fuel system works and the ignition system only works in hot conditions.

After the twenty minutes of driving, I turned off the engine and restarted it twice with no issues. So far it only starts when it's hot or sometimes if there's gasoline on the end of the spark plug.

 

[Just_Doin'_My_Own_Thing]

I'll do that but are you sure it isn't the spark plug struggling to start in the cold?

If you are concerned about the spark making it difficult to start, maybe consider buying a better cdi. That would make it a bit easier to start.

 

[GreasyChris]

Try a new plug then. It doesn't hurt to have a spare. Ngk b6hs or b7hs