2 Stroke losing power when hot?

[MattWadz]

Bike : MTX125 RW-L 1991

Im having a slight issue with my MTX and im sure theres plenty of mechanical guru's on here willing to give me some advice!

Soon as i start my bike ,and ride she pulls hard and is very responsive, as soon as ive been riding for around 10 minutes the engine is hot and seems to be slower/less responsive, im not expecting it to be rapid but it does certainly have a loss in power after it gets hot, if anyone has any ideas on what this could be please let me know!

Thankyou 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

[symonh2000]

Check the setting on the oil pump.

It could be that it isn't providing enough oil.

Also check the coolant level, and make sure it is circulating as it should do.
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Four strokes is two strokes too many.

[stickybackbob]

Right amount of 2 stroke oil getting through?

[N cee thirty]

both times i had this issue, the engine needed a top end refresh
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[Hetzer]

It sounds like it's starting to seize, so not enough oil or it's just shagged.
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"There's the horizon! Ride hard, ride fast and cut down all who stand in your way!"

[Raffles]

Your engine could be suffering from a leaking bottom end. If the crank seals or the cases aren't sealing correctly then the engine will draw in excess air and tend to run lean. This condition will tend to show up more when the engine heats up and the different mating surfaces expand and minutely separate.
Next time that the condition occurs, chop the engine and check the colour/condition of the plug.
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A good loser will always be a loser.

[evoboy]

[evoboy]

[cb1rocket]

[MattWadz]

oh right thanks everyone, il get on it like sonic and let you know! probably needs a top end rebuild again!

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