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Honda NSR 125 Flat/Dead Spot 7000rpm

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clewlow690
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Joined: 06 Oct 2010
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PostPosted: 10:56 - 26 Apr 2011    Post subject: Honda NSR 125 Flat/Dead Spot 7000rpm Reply with quote
Hi as with the subject my nsr has developed a huge dead spot at 7000rpm mainly in 5th and 6th gear. Has anyone any ideas why? Cheers!
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DrDonnyBrago
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Joined: 03 Jan 2010
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PostPosted: 11:29 - 26 Apr 2011    Post subject: Re: Honda NSR 125 Flat/Dead Spot 7000rpm Reply with quote
clewlow690 wrote:
Hi as with the subject my nsr has developed a huge dead spot at 7000rpm mainly in 5th and 6th gear. Has anyone any ideas why? Cheers!


Does it have an aftermarket exhaust or air filter (or even worse a cone filter)?

Is the exhaust blowing?

Air leak around the carbs making it run lean?

Could be a few things, if you have recently had the exhaust or carbs off I'd start there.
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Ethan
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Joined: 20 Oct 2010
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PostPosted: 11:46 - 26 Apr 2011    Post subject: Reply with quote
Isn't the powervalve suppose to open at around 7-8000 rpm?

Check that for gunk etvc
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clewlow690
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Joined: 06 Oct 2010
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PostPosted: 13:42 - 26 Apr 2011    Post subject: Reply with quote
yh its got a sports exhaust on but no other modifications. The exhaust was on when I brought it. Its only developed this problem in the last week or so it was running fine before that. When I try and open it up at 7000rpm it just seems to die as if its running out of petrol or something. Cheers!
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dextersaurus
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Joined: 26 Mar 2009
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PostPosted: 14:38 - 26 Apr 2011    Post subject: Reply with quote
Running rich/lean?

Try replacing the spark plug, easiest and cheapest solution Laughing

Dunc
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