PLEASE HELP WITH MY RX 125!!!!

[bikerbomb]

HELLO i recently brought a 1996 aprilia rx 125!! how ever asallways i was told its fine and works spot on started it and rode i but could only ride it in garden due to main road out side so long story short...
i have tryed to ride the new bike ( fitted with aprilia rs 125 rotax engine ) and its starts and ticks over nice asoon as i put it in gear and pull of its ok but open it up it pops back coffs and cuts out dead!! ? i have cheeked all ports and chainged the cdi from my rs and its fixed nothink please help ??
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live to ride ride to live

[dudders7]

Should be posted in the workshop.
Have you stripped the carb? Could be fuel suffocation, jets blocked. Strip the carb clean the jets and put it back together. Before you do that check the carb is getting fuel. Is there an inline fuel filter?
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Riding in the sun in Australia on a 04 Worked ZX10R along with a fleet of other crazy toys

[truslack]

This thread should help you: https://www.bikechatforums.com/viewtopic.php?t=236501

For the record, it sounds fuel related, has it got a standard airbox and filter?
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Current: Suzuki RG 125 Gamma, Honda H100, Triumph Tiger 800XC, Suzuki SV650 (minitwin)

[Pol Anorl]

sounds like twisted subframe or air-con needs re gassing, also try rosetta stone english level 1.
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[Robby]

Has the bike been stood outside doing nothing for a while?

A bit of water in the fuel could be a possibility. Drain the float bowl down and see if that fixes it. Easier than cleaning the carb.

[pits]

[dangerousdave]

firstly congrats on the new bike!

I'm sure you'll have great fun on it as it has a cracking little engine.

As to the loss of power, it does sound like your main jet is blocked in the carb. That would be the first thing I'd check. Take the float bowl of the carb off, unscrew the main jet and make sure it is clear.

If there is any muck in the bottom of the float bowl, fit an inline fuel filter to keep everything running cleanly.

Second thing I'd check is the air filter. Check there is one fitted and it is in good condition. If there are any rips or tears in it then replace it. Give it a good clean in White Spirit or simular. Then give it a little oil and refit it back into the air-box.

The next thing would be the spark plug. Check the correct type is fitted, and check the colour of the electrode. Is it white, brown or black. Each colour indicates how the air-fuel mixture is being burnt in the engine. White is very bad - engine will be overheating and likely to self-destruct. Brown is optimum. Black is bad, indicating an high petrol - air mixture.

The two-strokes go through plugs quickly so fitting a new plug is often a good idea when they are not running correctly.

See how the bike runs with those things done. It may solve your problem.
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1988 Kawasaki KMX 200

Previous: Yamaha YZF1000, ZZR600, KMX200, DT50, KX80, CG125, PF50

[Damon]

Does the bike have a powervalve? I had a similar problem with my RS125 years ago and simply overhauling the seized powervalve fixed it.

Otherwise it could be fuel starvation/mucky fuel as the others have said.