nsr 125 back wheel locking

nsr streetfighter · L Plate Warrior Joined: 30 Oct 2006 Karma :

ive got a '94 honda nsr 125. riding the other day and slowing down and coming down the gears, my back wheel locked. i got it home and took it out the next day, but when i went into 4th gear the back wheel locked up on me again. anyone got any ideas why? please let me know.
thanks, spence

hazza · World Chat Champion Joined: 28 Sep 2005 Karma :

could be a number of things, brakes binding, partial seizure etc
check you have oil in your two stroke etc and maybe do a compression test. could be the rear brake binding as said i used to get this on my rxs it used to snatch causing the rear wheel to lock
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3 Honda NC50's(Sold)-->'72 Puch Maxi S (Sold, want it back!)--> '90 Yamaha RXS 100 (Stolen)--> '87 Honda Cub 90(Sold) --> '95 Kawasaki Eliminator (Sold) --> '98 Bandit 600 (Sold) -->'07 SV650S (Current)

Walloper · Super Spammer Joined: 24 Feb 2005 Karma :

GET THE BACK WHEEL OFF THE CROUND
PUT IT IN NEUTRAL
TURN THE BACK WHEEL
LISTEN
IT SHOULD TURN IF YOU TURN IT USING YOUR BOOT ON THE TYRE.
IF ITS A BASTARD TO TURN 1ST CHECK FOR TENSION ON THE CHAIN.
IF IT'S GEARBOX/ENGINE THEN THE CHAIN WILL GO TIGHT WHEN YOU TRY TO TURN.
TRY THE SAME TEST WITH THE BIKE IN GEAR AND THE SPARK PLUG OUT PLUG OUT.

IF THE CHAIN SEEMS OK
ITS THE WHEEL.
BRAKES MOST LIKELY BUT MAY BE BEARINGS.
PRAY IT IS THE BRAKE.

GOOD LUCK.
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Blau Zedong · Banned Joined: 26 Jun 2006 Karma :

My thoughts are it might be seizing up Sad

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alains · World Chat Champion Joined: 08 Jul 2004 Karma :

me too !
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irving · Traffic Copper Joined: 02 Oct 2006 Karma :

faith183uk · Nitrous Nuisance Joined: 15 Sep 2005 Karma :

Does sound like a nip up (seizure) to me, although cant see why it would only happen in 4th gear unless just a coincidence.
Also check your rear pads, i had an TZR 250 reverse cylinder which i ran the rear pads down to the metal and as they heated up due to friction on the disc it would get so hot it used to weld themselves together causing my rear to lock up.

But my 1st guess would be partial seizure. Check your 2 stroke oil level and that your oil pump is working. There is a bleed screw on the oil pump, check here to see if any air in in the system. Also use a decent oil, not worth saving a £5 on a litre when a top end will cost a damn sight more.

kart racer · Nova Slayer Joined: 04 Oct 2006 Karma :

i don't personally think it is mixture or seizing as it only happens in 4th. It could be something with the gearbox, or i have done this a couple of times myself, but in third when i down shifted too quick and locked up the back.
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