MTX popping banging crackling

[MattWadz]

So my MTX hasnt been running right since i bought it, it seems to accelerate well but unless its at full throttle it seems to be crackling and popping like a 4 stroke fast idle sort of thing? im sure i heard someone tell me its 4 stroking or something? it seems to pull hard and fast at full revs but very spluttery and rough at anything less than full throttle? :S

Its difficult to get the bike to idle, and the idle screw is pretty much all the way in, the mixture screw is wound all the way in (Rich) and the circlip on the carb slide is on the bottom notch (More fuel). if i try and lean it out a bit, it takes ages to start and i have to bump it, asif the fuel is taking ages to get through? i have tried multiple spark plugs.

The reason it is like this im assuming is because it has had a new expansion chamber, a new end can, the snorkel has been removed and the airbox has been drilled.

if anyone could explain to me why this is and what i should do?

i would be extremely pleased!

thanks for reading!


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Pitbike x2, Mini Moto x4, China Quad, 02' Suzuki AP50 > 03' MBK Nitro > 86' Suzuki GP100 > 02' Yamaha Jog R > 57' Honda Lead 100 > 95' Piaggio ZIP Rst 50 > 51' Suzuki TS50x > 83' Honda CB125TDE Twin > 51' Yamaha Aerox > 98' Kawasaki KX60 > 89' Yamaha DT50MX > 80's Honda QR50 > 05' CG clone > 125cc China Pitbike > 91' Honda MTX125 RW-L > 09' Peugeot Speedfight 2 LC LR > Lucky MX 140cc > Apache Tomahawk 50 Quad (current = 2010 Yamaha WR125R

[Nobby the Bastard]

Why the hell did you drill holes in the airbox?

It always amazes me when people feel that they can do a better job of the intake side of the combustion than the original manufacturer.
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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."
Triumph Sprint ST 1050

[69chris]

[Nobby the Bastard]

[69chris]

[MattWadz]

i didnt personally drill the holes, whoever had it before me has done so!

okay so definetly upjet? just the main jet or pilot/idle jets aswell?

thanks
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Pitbike x2, Mini Moto x4, China Quad, 02' Suzuki AP50 > 03' MBK Nitro > 86' Suzuki GP100 > 02' Yamaha Jog R > 57' Honda Lead 100 > 95' Piaggio ZIP Rst 50 > 51' Suzuki TS50x > 83' Honda CB125TDE Twin > 51' Yamaha Aerox > 98' Kawasaki KX60 > 89' Yamaha DT50MX > 80's Honda QR50 > 05' CG clone > 125cc China Pitbike > 91' Honda MTX125 RW-L > 09' Peugeot Speedfight 2 LC LR > Lucky MX 140cc > Apache Tomahawk 50 Quad (current = 2010 Yamaha WR125R

[Nobby the Bastard]

[MattWadz]

alright il try a new main jet tommorow and post back, probably post a video up if it still isnt sorted out
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Pitbike x2, Mini Moto x4, China Quad, 02' Suzuki AP50 > 03' MBK Nitro > 86' Suzuki GP100 > 02' Yamaha Jog R > 57' Honda Lead 100 > 95' Piaggio ZIP Rst 50 > 51' Suzuki TS50x > 83' Honda CB125TDE Twin > 51' Yamaha Aerox > 98' Kawasaki KX60 > 89' Yamaha DT50MX > 80's Honda QR50 > 05' CG clone > 125cc China Pitbike > 91' Honda MTX125 RW-L > 09' Peugeot Speedfight 2 LC LR > Lucky MX 140cc > Apache Tomahawk 50 Quad (current = 2010 Yamaha WR125R

[Suntan Sid]

You could try taping over the holes, drilled in the air box, and see if it makes any difference!
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"Everybody needs money, that's why they call it money!"

[MattWadz]

ive tried blocking them up already and its just quieter doesnt really run any differently :/
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Pitbike x2, Mini Moto x4, China Quad, 02' Suzuki AP50 > 03' MBK Nitro > 86' Suzuki GP100 > 02' Yamaha Jog R > 57' Honda Lead 100 > 95' Piaggio ZIP Rst 50 > 51' Suzuki TS50x > 83' Honda CB125TDE Twin > 51' Yamaha Aerox > 98' Kawasaki KX60 > 89' Yamaha DT50MX > 80's Honda QR50 > 05' CG clone > 125cc China Pitbike > 91' Honda MTX125 RW-L > 09' Peugeot Speedfight 2 LC LR > Lucky MX 140cc > Apache Tomahawk 50 Quad (current = 2010 Yamaha WR125R

[gbrand42]

What colour is the plug? Have you done a plug chop?
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Yamaha RD50M, Honda C90, Yamaha RS100, Yamaha RD125LC, Honda XL125 V9 Varadero, Honda NT700VA, Honda VFR800X, Honda CRF1000L, Honda ST1300 Pan European