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 help.. rough running rs

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bluemonk
naik moto 50cc
naik moto 50cc


Posts : 1
Join date : 2011-10-24

PostSubject: help.. rough running rs   Mon Oct 24, 2011 12:39 am

Hi all,

I decided to risk my sanity and am now (since Aug!) the proud owner of an rs250 here in Malaysia. This is my first two smoker, and my garage/mechanic appears to be at his wits end as to how to fix it. He did the pistons, rings and gaskets to get the bike to run smoother, and though it did help, it does not appear to have fixed the fundamental issue. Guy keeps cleaning the carbs like somehow this time its going to make a difference (3x already!). I'm guessing thats not the problem....

The issue is that the bike appears to hesitate on throttle and have flat spots, but seems to be okay at higher revs. But after a good run at revs, she will bog down (seriously) after coming to a stop. It bogs down for a few minutes (during which time I'm limited to say 4k in rev range regardless of throttle position) and then after that she goes back to revving like a maniac (i.e. normal). Additionally, the exhaust appears to leave a lot of dark, thick oil in the can. Finally, I noticed there is incredible amounts of smoke when you first start up. Last issue is that it runs really hot.. I see the temp gauge over 100s, up to 104 regularly... Is that normal? After 100 it starts blinking which makes me think the fan should be kicking in at that point..

Here's my poor attempts at fixing/rationalizing : I suspect this has to do with the oil mixture the pump is putting into the engine. Separately, there is a little extended screw/adjuster which the previous owner set up to adjust the air/fuel mixture.. I gave that a twiddle (to the left - im guessing leaner air/fuel mixture) and took her for a spin, that appears to have helped, but still a lot of oil in the exhaust can. As for temp gauge, no ideas... Mechanic says its normal??!

So.. after hearing my rationale, anyone care to take a view as to what the heck the freakin problem is? I'm about to give up on two strokers and that would be a bad thing, coz the bike is fundamentally awesome. Low weight, good power, incredible handling, I really want to love her, I do!

Much appreciated,
Tone
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Pizo
naik moto 50cc
naik moto 50cc


Posts : 24
Join date : 2011-09-26
Location : Ipoh West M'sia

PostSubject: Re: help.. rough running rs   Mon Oct 24, 2011 10:15 am

Well Tone,
Better take it to Aprilia expert mechanic ONLY bro. Not all superbike workshops knows this 2 stroke legend bike well enough, I belive only few in KL available.

SOS to the rest of members.
hope the club's otais can give some useful suggessions..
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ds24
naik moto 50cc
naik moto 50cc


Posts : 122
Join date : 2010-01-17

PostSubject: Re: help.. rough running rs   Mon Oct 31, 2011 3:52 pm

It could be your powervalve not working properly as it should....maybe you want to check that as well & make sure your jetting on the carb is correct. I'm no expert but there's a few workshop in KL that is, sent it to them & let them have a look. words of advice, dont sent this Italian Stallion Beauty anywhere else except to an expert lol...
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alexz
naik moto 50cc
naik moto 50cc


Posts : 2
Join date : 2011-08-21

PostSubject: Re: help.. rough running rs   Mon Oct 31, 2011 8:30 pm


Souds like your bike is running lean, and the 2t pump is running rich... Get your bike to someone who knows RS250/RGV250 and ask him to tune the carbs (mainjet/needle etc). The big carbs on the RS250/RGV full power version is known to be very difficult to tune properly...
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PostSubject: Re: help.. rough running rs   Today at 2:35 am

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