lexmoto assault 125 efi 2020

[Wal123]

Owed this bike from new (bought for my son, now up to 5000 on the clock), up to date with servicing from the dealer, however, the engine has slowly been losing power, difficult to start, cut out on tick over once ridden for less than a 100 yards.

I'm a qualified Plant mechanic, left the bike alone because of the warranty. After several visits to the dealer, and my son being late for work, I opened my toolbox. It tuned out to be no valve clearance, tappets solid, valves not fully closing. Easy to adjust once tank removed, engine (luckily, could have damaged valves) now purring like a kitten, power restored. Has anyone else experienced the same problem?

[Nobby the Bastard]

Sounds like the valves are wearing the valve seats excessively.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Wal123]

Yes, could be? Let's see how long she runs before more adjustment is required. This bike has a hard life, long steep hills, everyday rough riding, we will see?

[Nobby the Bastard]

By 'hard life' you mean 'ragged everywhere by a 17 year old' don't you.


Just be grateful it's not a.125 2t of my era.....
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Easy-X]

From my experience of Chinese 125s to get the best out of them they need a minor service every 6 months, i.e. valve clearances, oil change, inspect plugs & air filter. Certainly for the mileage you've managed.
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[steve the grease]

Bikes like this have very small valve clearances, they should be 3 thou if what I looked up is correct. It's probable that as the machined faces of both valve and seat have bedded in that the clearances have closed up- it should have been checked and reset at one of the early services. Thats dealers for you.
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All the above is my personal opinion, you can see my lips move, but I'm talking out of my arse.
I've been riding, and fixing , bikes for 50 years, in that time the more I learn, the less I am absolutely sure of.....