Honda NSR 125 Carburettor

[sinety]

Hey guys,

basically today i fixed the speedo on my bike so thought it was time to open the old girl up for the first time since buying it (2003 Reg, 89k miles on the clock)

So i get onto the A414 and hit about 65 mph when i feel the rev's dieing on me so i though ok ive gone up a gear to soon so when down one but it continued to die. after pulling onto the hard shoulder and feeling a little more safer than before i checked the bike out.

when i rev it, it gets to about 3000 rpm before it dies and resets back down to about 1rpm (with the choke open it gets to about 7 Rpm, if i rev slowly and gradually it will get all the way up to about 11 or so, sometimes anyways)

So i call the RAC guy out and he says my Carburettor probably needs cleaning and mucking out.

Now me and the bike are home after being picked up, i was wondering how i would go about this.

Remember this is my first bike and vehicle for that matter (im 17)
so all this is new to me.

Thank you

Regards

Sinety

[Skinned]

Sounds like fuel starvation, first thing i'd check is the fuel filter make sure its not full of crap. The carb is pretty straightforward, I had similar problems with my nsr when I first got it. This was caused by sticking floats in the carb and an air leak under the air intake box.
One other thing is if my NSR is running low on fuel it will do exactly the same.

[sinety]

i have no idea what the Fuel Filter is
i filled it up with petrol yesterday and theres loads in there so it deffinetly isnt that.

i guess ill just have to take the body off and fiddle around untill i find the carb ha

[Syris the Indomitable]

[stirlinggaz]

read this https://www.bikechatforums.com/viewtopic.php?t=17124
Dellorto's are fairly easy to dismaantle & re-assemble
lift fuel tank & follow fuel hose from the tap on tank, down to where it clips onto the carb. (you may have an in-line fuel filter 1st, this will ned cleaning or replacing) & remove the bolt holding the banjo on (8mm socket iirc) & underneath this is a disc shaped nylon gauze fuel filter.
remove & clean.
remove the carbs float bowl while your there & give the jets a good spray with carb or brake cleaner, then blow through with airline.
cheers,
GAZ

[alains]

due to the mileage , i recommand before touching anything to have your compression tested , then if you are under 125 PSI it's time to rebuild top-end if bottom-end is OK
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