Question about 2008 Aprilia RS 125

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Lack of power and smoking from exhaust

Problem had slowly got worse and the engine won't rev above 8000 and if throttle is kept at 8000 engine starts to die unless throttle is released with lots of smoke coming from exhaust . Speed has dramatically declined and struggles to pull away and can be riding when I start to lose power thank you mark

Posted by Anonymous on

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  • Aprilia Master
  • 43,738 Answers

Hi Anonymous, you may have squeaked your top end this is commonly known as "HEAT SEIZE" the piston heats up expands and becomes extremely tight in the cylinder bore and usually occurs mainly on 2 cycle engines right after a fresh top end rebuild, but it can also happen to brand new motorcycles, these are rare instances due to better quality control and education. Overheating failures that cause pistons to seize are many and each one should be carefully diagnosed to prevent future repeat offenders and the usual suspects are:
1. Loose fasteners causing intake or base gaskets to leak or crankshaft seal failure caused by age, overheating, or walking. 2. Improper assembly of reed valve gaskets.
3. Improper oil/fuel premix ratio.
4. Broken, pinched, or cracked fuel line.
5. Carburetor fuel passages clogged or restricted from stale fuel varnish, ethanol sludge, dirt, rust, or fuel level in float bowl too low.
6. Main jet size too small.
7. Air filter improperly installed, missing or not sealing.
8. Faulty or improperly adjusted oil pump and or cable.
9. Failure to bleed oil pump after running oil tank dry, rebuild of pump or replacement
10. Among the causes of lack of cylinder, lubrication is clogging of lubricator by dirt or waste, obstruction in oil pipes/lines, leaky check valves, leaky pump packing, broken oil pipe/line, oil too cold to feed.
11. Wrong type of oil used in premix or oil tank
12. Improper spark plug heat range (too hot) and or gap.
13. Ignition timing retarded, faulty CDI.
14. Excessive engine load, brakes dragging, clutch slipping, transmission lubricant level too low or viscosity to high.
15. Engine coolant level too low, too old, or improper mixture ratio.
16. Engine coolant pump failure, damage, or passages restricted.
17. Radiator clogged, fins damaged, or faulty cap.
18. Failure to follow proper break in procedures.
For more information about your issue, please visit the websites below. Good luck and have a nice day.
DOWNLOAD 2008 Aprilia Rs 125

Posted on Oct 23, 2015

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6 Suggested Answers

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Posted on Jan 02, 2017

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emjem74
  • 162 Answers

SOURCE: Bike won't rev up

i have had a lot of experience in this bike, the parts are really hard to get hold of from experience. this did happen to me but mine had a 65 bore kit on it and it turned out to be the bearings. there is not much that can stop a two-stroke bike reving up like that as the mechanics inside are very straight forward. a good tell tale is to check the inside of your sump plug, if there are filings on it as it is magnetic, this is more than probably the bearings and will need rebuilding. really sorry if this is nto the answer you are looking for.

Posted on Feb 26, 2009

DickCanFixIt
  • 948 Answers

SOURCE: engine cuts out

It sounds like something is preventing the bike from getting fuel. Check fuel filter, fuel tank vent, air filter too. If you have vacuum building up in the tank, letting the bike sit for a few minutes slowly releases that vacuum allowing the pump to pull fuel easily again for a bit. Next time the bike quits open your fuel tank. If you hear a whoosh of air being sucked in look for a plugged vent line. A plugged air filter can have a similar effect but the only way to check that is change the air filter or look at the one you have. It would have to be really, really dirty or plugged with some debris to cause this problem.

Posted on Mar 01, 2009

ginocussen
  • 216 Answers

SOURCE: my bike is a bit splultery in low revs

Hi, Being an 02 has it had a full service history? your problem could be something simple like a clogged fuel filter, so that when the revs rise enough fuel is available than lower revs. there is also a filter behind the fuel tap in the tank. the powervalve could also be clogged. another common problem with 2 strokes is the exhausts need to be de-coked because carbon build up can restrict gas flow. If you can remove the exhaust then you could take it to a garage where they will blow it out after heating it with an oxy-acytelene torch. If its none of these things get back and I will do my best to figure out where to look next. Good Luck.

Posted on Mar 19, 2009

ollie reece
  • 1167 Answers

SOURCE: i have a rieju rs2 50cc 2008 randomly losing power

yes buddy could be plug run a br8eg plug in there this is the same engine as my brothers motospania am6 engine get back to me if it carries on also dont overtighten the plug read the box carefully

Posted on Oct 12, 2009

  • 409 Answers

SOURCE: to keep my engine running i have to pull the

has the bike been sitting for some time? Sounds like a classic case of gummed up low speed jets in the carbs. Pull the carbs and clean then out.

Posted on Mar 11, 2010

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