honda nsr 125 engine rebuild

Discussion in 'Scooter Projects' started by m1ck_t, Sep 24, 2008.

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  1. WOLFFY

    WOLFFY New Member

    Messages:
    4,135
    Rides:
    Runner 172
    Yeah thats cool mate. You ever need any help again you know where I am.
    But next time you want me to flow your cases, port your barrel, fit your crank an beatings, rebuild your engine, set up you carb, spray your panels, polish them and then drop it off to you, I'm gonna start charging!
     
    WOLFFY, Jan 15, 2009
    #201
  2. Vesta

    Vesta New Member

    Messages:
    2,615
    Heck i'll set up the carb for free
     
    Vesta, Jan 15, 2009
    #202
  3. m1ck_t

    m1ck_t Moderator Staff Member

    Messages:
    3,627
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    alot of shit
    ;)

    lol

    cheers boys
     
    m1ck_t, Jan 15, 2009
    #203
  4. jackdim

    jackdim New Member

    Messages:
    13
    Some people run a 34mm VHSB on these, but there is some work involved in fitting it. If you're interested then I'll dig out a guide for you. However you'll probably lose power in the mid with some gain up top. Not worth it on a road bike IMO, better off sitcking with the 28mm PHBH.

    I'm not aware of these pistons but however I can't understand how a single ring would make more use of the ports than a twin. Surely all a single provides is less friction so the bike is able to rev higher faster? Obviously running a single ring the one ring will probably need to be replaced more frequently.

    Now this has really got me confused, I've been trying to think how you'd do this and the only way I could think of is turning the bike into a 3 speed instead of a six lol.

    The porting on the jc22 is very restrictive, plenty of room for improvement. There's even a guide on how to do so with portmaps etc, if you're interested then I'll link you to it.

    Ta,
    Jack
     
    jackdim, Jan 15, 2009
    #204
  5. MiNoR cOnFuSiOn

    MiNoR cOnFuSiOn Administrator Staff Member

    Messages:
    14,276
    Rides:
    et2 monster
    by using a single ring piston you can comfortably enlarge the secondary transfer ports without the ring end going over a port.
    lighterning ANYTHING gear/clutch related means there is less motion lost to turning weight of the parts. centrifugal force/inertia is only any good once its moving, getting it to move takes power. snappy torquey bikes have lighter componants.
    bung the port maps in the thread
     
    MiNoR cOnFuSiOn, Jan 15, 2009
    #205
  6. px166bajaj

    px166bajaj Active Member

    Messages:
    1,367
    Is that the reason behind single ring pistons? (always trying to learn!)
     
    px166bajaj, Jan 15, 2009
    #206
  7. m1ck_t

    m1ck_t Moderator Staff Member

    Messages:
    3,627
    Rides:
    alot of shit
    porting was an option at first but as the parts came in i didnt really want to start tinckering about with a dremmel specially not properly knowing wat i was doing. the idea of the single ring piston also went out the window as soon as i saw that 100 + quid price tag, lightening components meant sending parts off to someone who knows wats wat, oh and im prettysure the port maps will be the same once i pm'd you minor a while ago
     
    m1ck_t, Jan 16, 2009
    #207
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