NSR125 startup Problem

[Deluce]

HI all

I have a hondaNSR125, that don't seem to want to start in the cold
or when left for 2 days or so without a run
I have a new battery and spark plug


I went to a friends house and left the bike out side in the cold for about 1hr
when I went back to it, it would not start

any ideas ?

THX

[the grim reaper]

Check that your regulator/rectifier is charging the battery, even a new battery will drain without being charged when you ride. Ideally you need a multimeter, you're looking for about 14.5 V across the battery when the engine is revved.

A cheap check is to see if the lights get brighter when you rev the engine. This doesn't necessarily mean that the reg/rec is healthy though, it may be putting too much voltage across the battery which will also fry the battery.

Cheers

Grim
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[knockout_bar]

Ummm, are you trying to start it without the choke?
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[alains]

i agree with you , but it will be more efficient to upjet the carb , especially the slow jet . i had this problem in the past which i solved partly by putting the choke on after having stop engine . but changing my 38 slow jet by a 42 made the trick . the late models are really underjet (132,38,55) , the best is to fit 138,42,65 for £10 ish
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[Deluce]

[alains]

clean carb & tank (tap also), air filter foam , change your jets , fit a BR9EIX and it will be ok
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the worst day fishing is better than the best day working

[Deluce]

[alains]

this is a race plug . they are expensives (£6.84 ex VAT) but very efficient and will save 1/2 to 3/4 L on a full tank
https://www.sparkplugs.co.uk
generaly i fit a BR9EIX this time of the year and the BR10EIX in hot days or if i run mainly on motorways
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the worst day fishing is better than the best day working

[WizardofNos]

I have that problem but luckily it stopped it from being stolen !!

I found the problem was because I always had my lights on! every were I went.. even short journeys.. it kill's a crap Batt..
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I hope it's not a repost!

[Deluce]

[True Blue]

Sounds as if your battery isn't being charged properly when your out riding
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[Aikman666]

How long have you had the battery? All of the recent cold weather may have helped kill it so it has a smaller capacity than usual.
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[alains]

it seems that your battery is worn , buy a new one (less than £20)
download this file from my ftp
https://www.geneva-racing.com/~alains/NSRtips.doc
you will find studies on the batteries
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the worst day fishing is better than the best day working

[Deluce]

[gamerboy]

where you from deluce?

[tokarev]

Make sure that you are using the right battery. The NSR uses a YTX5L-BS.

If you are using the incorrect one, then it may not me able to gain charge from the system.

[Deluce]