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NSR 250SE MC21 problems

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kyle
L Plate Warrior



Joined: 21 Sep 2007
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PostPosted: 15:42 - 21 Sep 2007    Post subject: NSR 250SE MC21 problems Reply with quote
Bike splutters at high revs, had bike a month. replaced plugs and given full service dhecked CDI alles. Puzzelled.. Please help Shocked
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TUG
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Joined: 12 May 2007
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PostPosted: 15:57 - 21 Sep 2007    Post subject: Reply with quote
have you tried setting the carb up propperly?
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hmmmnz
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Joined: 22 Aug 2006
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PostPosted: 23:05 - 21 Sep 2007    Post subject: Reply with quote
try balancing the carbs, im guessing you have a standard setup, and havn't changed the expansion chambers ect,
otherwise a rejet is in order
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MarJay
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Joined: 15 Sep 2003
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PostPosted: 23:25 - 21 Sep 2007    Post subject: Re: NSR 250SE MC21 problems Reply with quote
kyle wrote:
Bike splutters at high revs, had bike a month. replaced plugs and given full service dhecked CDI alles. Puzzelled.. Please help Shocked


Could be the carbs just need cleaning out to be honest.
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bish777
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Joined: 11 Nov 2004
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PostPosted: 23:26 - 21 Sep 2007    Post subject: Reply with quote
get the carbs out for a clean, check fuel filter and replace if there is one. Make sure your pipe isnt leaking anywhere, and that the airbox and rubbers arent leaking either.
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TUG
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Joined: 12 May 2007
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PostPosted: 12:16 - 22 Sep 2007    Post subject: Reply with quote
BLUEX5 wrote:
XlonewolfX wrote:
have you tried setting the carb up propperly?


Just the one carb? Do you even have any idea what type of engine an NSR250 has.

Lonewolf = Stokesy senior!!!!!

no i dont but if itneeds setting up propperly then it needs setting up. one of them could be out.
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bladerunner
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Joined: 09 Sep 2006
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PostPosted: 12:36 - 22 Sep 2007    Post subject: Reply with quote
Could be a number of things. Does it only do it a WOT?. Have you done a plug chop to see if its running rich

When you drop the carbs off check the main jet sizes then have a look on the NSR world forum as they have loads of info for the NSR's



Just make sure you spell correctly or they take the micky!!https://www.nsr250.net/forums/viewforum.php?f=2
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Barry_M2
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Joined: 09 Sep 2004
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PostPosted: 15:51 - 22 Sep 2007    Post subject: Reply with quote
hmmmnz wrote:
try balancing the carbs, im guessing you have a standard setup, and havn't changed the expansion chambers ect,
otherwise a rejet is in order


Unballanced carbs will only affect idle.

NSR250 runs powerjets, these are opperated by a solenoid. That would be one area to check, also, make sure the power valves are opening and closing as they should do.

But to be honest, it sounds to me more like a fueling issue. Could just be down to a blocked jet.

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TUG
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Joined: 12 May 2007
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PostPosted: 22:50 - 22 Sep 2007    Post subject: Reply with quote
only affects idle? on my fzr, if there out it makes for shite running, but idles ok, or is the nsr250 use completely different carb components?
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bladerunner
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Joined: 09 Sep 2006
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PostPosted: 00:13 - 23 Sep 2007    Post subject: Reply with quote
The nsr is TOTALY different to the cv carbs on the FZR. It wouldnt cause high end missfire. I race an RGV myself and these little strokers take a bit of skill to set up properly (not saying the fzr carbs dont Laughing but thems a totaly different kettle of fish!!)
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TUG
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Joined: 12 May 2007
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PostPosted: 00:15 - 23 Sep 2007    Post subject: Reply with quote
ahh right, with you now, wouldnt mind a rgv or a nsr to tinker with, nice old bikes.
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kyle
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Joined: 21 Sep 2007
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PostPosted: 09:37 - 25 Sep 2007    Post subject: NSR 250SE MC21 problems Reply with quote
Over the weekend, inspected further, stripped bike down, ran through all electrics, replaced fuel filter, checked plugs, the once cylinder was not burning the plug properly, apon further inspection played around with the throttel sensor attached to the carbs and took bike for a quik spin. Fan perfect, till the next day it was up to no good again. maybe the sensor is causing this? Any similar problems and answers. Were can i purchase spares such as these. Im from South Africa, Durban. Shot, Rolling Eyes Thumbs Up Thumbs Down Twisted Evil
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NSR Mick
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Joined: 26 Jun 2005
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PostPosted: 09:45 - 25 Sep 2007    Post subject: Reply with quote
Get over to nsr-world.com I'm sure we can work it out between us.
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kyle
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Joined: 21 Sep 2007
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PostPosted: 09:48 - 25 Sep 2007    Post subject: NSR 250SE MC21 problems Reply with quote
Howzit man, been there many times, havent been able to find somthing on the throttel sensor or exactly how to set my RC-Valves for the power-valves.
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NSR Mick
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Joined: 26 Jun 2005
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PostPosted: 09:58 - 25 Sep 2007    Post subject: Re: NSR 250SE MC21 problems Reply with quote
kyle wrote:
Howzit man, been there many times, havent been able to find somthing on the throttel sensor or exactly how to set my RC-Valves for the power-valves.


To set Powervalves start the bike. rev it up to between 1500 - 3000 rpm i think and the powervalves will fully open. Kill the bike with them fully open and then align the marks.
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kyle
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Joined: 21 Sep 2007
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PostPosted: 10:02 - 25 Sep 2007    Post subject: NSR 250SE MC21 problems Reply with quote
Sweet, will give it a shot. thanks man hopefully its just a matter of setting up and tuning.
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kyle
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Joined: 21 Sep 2007
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PostPosted: 12:20 - 26 Sep 2007    Post subject: Reply with quote
Shot for the help okz, called up one of the local tuners in durban and will be sending bike in for tuning. all else is 100% Laughing Laughing Laughing Laughing Cool
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