honda nsr 125 engine rebuild

I know it's not a SCOOTER project but I thought id share this with you lot.
Anyway after a disgusting dry seizure I dropped my engine out and had a sniff around the lump.



whiped the top end of and found this







mains and seals are surprisingly perfect but will be replaced anyway just to be on the safe side,crank seems very good too.(thank god)

powervalve on the exhaust port is slightly seized

the lines on the barrel are not faint scratches, they are at least 1mm deep scores, and the barrel spaeks for itself really.

got the new piston rings already and a new gasket set. still waiting on news if my barrel can be welded and rebored or am i forking out for a new one.

hoping to do this within 2 weeks so updates will probs be slow, thats if mods/admins allow this thread to stay here

 

almost forgot.

plans are

tyga performance pipe with yoshimura can, new boyesen carbon reeds and a touch of port work on the barrel

14t front sprocket and 35/36 rear

 

up the carb size DEFFO... change the crescent on the powervalve for an excentric crescent... small to big.

if you want a little more for not much money then try and find somone to reprofile the head and depending on your bore try and find a grand sport piston, one ring but fuck me do they make use of the ports..

can try and offset balance and lighten the crank, flywheel and balancer shaft if your pullin it to bits and mabey lighten some gearbox bits...

 

yeah i'v heard about this small to big pv crascent business but dont know anything about it tbh.

i am very interested in the grand sport piston and head reprofile though. but i have to find someone to do it and be the sounds of these pistons are hard to come by.(all depending on my barrel offcourse)

hartgates might have a barrel for me(you must know them)

dont think i'm gona lighten anything but i might get another engine next week wich means i have plenty of time to play about with it. might even send it your way in time.

cheers for the info minor

 

dont touch geard unless there mine.. soz LOL

 

:rofl: , yep i'm probs on that piece of shit for a week or two till my parts come through and got my bike back on the road.

they let you do your own bike in merton?

minor

thanks anywaay for the input :tup:

 

sorry m8... cant be arsed with doing other peoples geard smokers... toooo expensive LOL

 

lol. fair enough then

 

thats a fookin understatement?!?! not set out,. your toolbox is called a garage floor! messy bastard

 

cheers for that alex, i'v looked on the first site you provided and found a piston and rings for 30 quid, wich is quite good so i'l order that in the morning, i'm desperate for a cylinder as i'v just been told that my one is way beyond repair. so need a new one or a very very good second hand one ale:

been thinking about tunning the bike beyond my original plans and have come to a conclusion that i simply want her back on the road asap and use the best parts i can find (none of that pattern shit), cant be asked to mess about with the tranfer ports and all that, my boss has already told me that he will get a good friend of his to port my barrel slightly for free so i'm well happy with that as it is.

 

cant run a drop forged pistopn in nicasil lined ali

 

:banana: i'v managed to get hold of another barrel, i'l have a good look at it when it arrives next week and if necessary i will get it re-bored.

also sourced a 34mm dell carb, so its been a good day for me

 

noice
154's are big money but GOOOOOOOD fun
50ish horse nsr is the biggest giggle round town

 

i bet it is , i simply cannot afford to spend 300 odd quid at the moment. all a matter of time and money really. no doubt i will get a polini kit for her in a few months time though, need to start saving :rofl: