Speedfight 1 70cc issue

[Paul smifff]

Hi

I have a 70cc speedfight that has been running fine. More recently after about 10 miles it's starts to loose power almost like the carb is suddenly starved of fuel. Any idea what might cause this when it's warmed up

Part of me thinks a mixture issue or plug breakdown.

Any ideas welcome

[Nobby the Bastard]

After ten miles? Fuck me, that's a long way for fuel starvation or a coil to break down.

It's only 70cc. It's probably just out of breathe.

Warmed up, be fucked. Its warmed up, done a marathon, had a press conference after the race and is looking forward to an ice bath.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[slowasyoulike]

If it was a mixture issue then it would run like shit from the off, not just after 10 miles. Most of the 2-stroke things I've had the misfortune to own ruined spark plugs for fun, though, so that's certainly worth a look.

[Nobby the Bastard]

[WD Forte]

Stock speedfights came in 50/100/125cc flavours
so 70cc means 'owner improvements'
so we know who's to blame for this
____________________
bikers smell of wee

[Nobby the Bastard]

I wasn't going to say that but yes.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[slowasyoulike]

[slowasyoulike]

[Paul smifff]

Hi

The bikes been a 70 for the last 23 years with a fresh build about 2 years ago. It's been fine for quite some time, the plug is a year or two old. I'll try a new plug and coil just because it won't hurt.

[Nobby the Bastard]

Thinking about this it's most likely an overheating issue and it's heat seizing.

As to whats actually causing it to overheat....
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Paul smifff]

I wondered about heat seizing. It's a liquid cooled model but that doesn't mean to say it can't over heat. I'm not sure what could cause her to over heat. Maybe try a colder plug???

[Nobby the Bastard]

If it's liquid colled I'd be looking at the cooling system first.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050