Bike jerking and lose of power.

Kiingyy · L Plate Warrior Joined: 17 Jul 2015 Karma :

Hey, I have been riding for about a 2 weeks now on a brand new Lexmoto Venom 125cc, When i try accelerating (even when moving off from traffic lights) my bike jerks slightly and i lose some power, it has been doing this since i had the bike serivced yesterday, Anyone have any thoughts on it? Would be awesome to know as im brand new to riding, I know the bike is chinese but surely problems shouldn't occur this early into getting it, I have only done about 230 miles.

Thanks
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New to biking and need any advise.

B0ndy · Spanner Monkey Joined: 25 May 2015 Karma :

What did the service involve?
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CBF 125 -> CB400SF -> GSX600F -> ZX6R (G1) -> GSXR1000 K4 -> ZX6R (B1H Stunt bike) -> VFR800 -> R1 5PW -> Sprint 1050 -> Fireblade 929 -> ZX10R C2H -> GSXR1000 K3

delsol · World Chat Champion Joined: 12 Apr 2011 Karma :

Kiingyy · L Plate Warrior Joined: 17 Jul 2015 Karma :

They changed the engine oil and the Oil filter, Tightened my chain cause they said it was lose and cleaned the spark plugs.
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New to biking and need any advise.

delsol · World Chat Champion Joined: 12 Apr 2011 Karma :

Kiingyy · L Plate Warrior Joined: 17 Jul 2015 Karma :

Sorry but i am very new to riding and know next to nothing about, Bikes, I have no idea how to change/clean spark plugs or where they are or what they look like. I know im an Amateur but we all have to start somewhere. And also how would cleaning spark plugs effect how my bike accelerates?
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New to biking and need any advise.

delsol · World Chat Champion Joined: 12 Apr 2011 Karma :

Mysteriass · Nova Slayer Joined: 06 Apr 2015 Karma :

The spark plug is creating a gap in a timed on/off electrical circuit (timing). When the power in the circuit meets the spark plug it is forced to (sp)arc over the gap. This arc of HT (High Tension) power is what ignites the fuel in the cylinder barrel that the carb or injector just put there. When the fuel ignites it pushes the piston down which turns the motor.

The spark plug has to be clean in order to have good electrical contact between its gap. If it gets covered in shit, the bike will run like shit.

Possible that they've altered the gap (place where the electric arcs) in the plug when they cleaned it. That gap may also affect the performance of your bike. The idea is to have a BIG spark but not so big that the ignition circuit from the coil doesn't want to bridge the gap. You also don't want a small gap that makes a small electrical (sp)arc and won't ignite the fuel so efficiently.

Be careful with the plug when replacing it if you take it out. The head is made of alloy, that means you can strip it with very little torque. Screw it in finger-tight, gently, making sure not to cross thread it. Then get a plug spanner on it and just give it a...just make it feel "right". Screwing anything into alloy requires little more than finger tightness and it's very easy to cross thread so you need to get a feel for that.