Hi im new to all this i have a rs 125 and wen i ride it and get to 6000 rmp its bogs out for a couple of secons ive changed the oil spark plug bat etc only thing i havent done is gear box oil could that be a problem i would say between 5000 to 6000 rmp it dies then goes into power band can any 1 help me please?
Problem with aprilia
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It could be a number of things - RS125's are fickle and need constant maintenance to keep them on song. It is not unusual for a 2-stroke to 'cough' and clear it's throat before taking off as you hit the powerband. Particularly a highly tuned bike like yours.
What is the mileage? Is it standard of modified? Also do you know much about its history? - particularly the service history.
Has it just started?
Or done it for a while?
How long have you had it?
What oil are you running (or has it been run on)? When were rings / liners last done?
it won't be the gear box oil
If the bike hasn't been looked after that might be overdue a change too, but it's no going to cause the bogging you describe.
Gummed up carb? Reed valve not matched to exhaust? Some non-standard fettling?
Whatever, it's worth finding someone who really knows these bikes to take a look. Something as simple as running a bit lean or slightly advanced ignition can cease a two stroke, meaning at least a top end re-build. Don't trust it unless it's running properly.
Mind you, are you sure it's wrong? I read that the standard CDI supposedly retards the ignition around 5-6000rpm to pass emission type approval tests, making them bog badly there as standard.
Aprilia RS 125 Year?
Hi Younggun2011 and welcome to the site
Hard to say with the info given?
If everything seems good besides this flat spot at 5-6 thousand rpm then i would take the bike on the M-way and cruise for 20-30 minutes at 8-9 thousand rpm.See if it clears the problem,if it does its probably the power valve gumming up with unburnt two stroke oil,and exhaust port and pipe getting heavy carbon and oil deposits.If it doesn't clear,then its probably a carb clean(check for water in the carb float bowl as this could mean water in the fuel tank)check the air filter is clean.If still no joy, it may need a de-coke,and the oil pump resetting(could be set running a bit to rich) or the power valve cables adjusting.Good Luck
P.S. Make sure you give it a good 20 minutes or more on the M-way not 5 minutes that wont do.
Hi, I have performed a full rebuild on 1 of these bikes. I would check the power valve, as it cloggs up after a cirtain amount of time. If it is nt this ur mix might be wrong as these bikes are scensitive. You'll find both the location of th power valve and the correct mixture settings in the manual. If all this fails, I would just check over the full fuel and oil supply system, cleaning and checking every hose and filter. Hope this helps, enjoy the bike while it lasts.