Yamaha Neos engine conversion

Discussion in 'Scooter Projects' started by Shunty, Jun 29, 2020.

  1. Shunty

    Shunty Member

    Messages:
    172
    Rides:
    Baotian BT49QT-9
    Had this Yamaha Neos 2T for a few years riding to work
    Sadly engine seized up and to bad to repair and needed new engine but was very expensive
    So decided to get second hand engine off Ebay but went for a 125cc GY6 4T 152QMI
    Got one for 99p, no bids, with rear wheel and no caliper.
    Was local so could spend a bit on engine alone at that price
    Striped out head and all good no wear of bore and looking very new inside
    To fit in scoot would have to alter engine top bracket which I did
    Wiring was simply changing plug from stator and used original 2T CDI unit although have read you cant, but you can as only 1 degree difference in advance and works as is AC voltage so no case to rewire
    So got it running and gave it a test ride and goes really well
    A few other things had to do was this scoot was a 2001 model with manual choke so with different carb had to wire in for electric choke
    It now has all round disc brakes after rear brake lever ,pipe and caliper as one kit, which is good and a 1 inch bigger rear wheel but is on low profile tyre so no difference to front.
    The Neos has the centre stand on the bottom of the engine but 125cc does not so fabricated a new one with gas shock operating, no spring
    Sorry did not take photo's as doing conversion, but here is the finished scoot,


    IMG_20200628_105446 8x6.jpg IMG_20200628_105504 8x6.jpg IMG_20200628_105525 edit 8x6.jpg IMG_20200628_105558 8x6.jpg IMG_20200628_105615 8x6.jpg IMG_20200628_105627 8x6.jpg
     
    Last edited: Jul 7, 2020
    Rickard Pingol likes this.
  2. YamahaOvetto91

    YamahaOvetto91 Member

    Messages:
    62
    Looks so good ! 125 engine for 99p !!!! There's me struggling to find a clutch and it nearly costing me £372 hahaha
     
  3. Shunty

    Shunty Member

    Messages:
    172
    Rides:
    Baotian BT49QT-9
    i know, scoots can be so much of a problem.
    give it another run today later
     
  4. Shunty

    Shunty Member

    Messages:
    172
    Rides:
    Baotian BT49QT-9
    UPDATE

    Took it out for a second run and coming back home heard a loud bang and a weird noise
    Limped home about 1/2 miles and found that a small branch had got flicked up by front wheel and punched through to cooling cowl and smashed the fan F... it

    UPDATE

    New fan and repaired cowl

    The culprit

    IMG_20200628_165631 8x6.jpg

    IMG_20200628_165639 8x6.jpg

    IMG_20200628_165649 8x6.jpg
     
  5. YamahaOvetto91

    YamahaOvetto91 Member

    Messages:
    62
    Mate that is bad , how on earth did that even happen
     
  6. Shunty

    Shunty Member

    Messages:
    172
    Rides:
    Baotian BT49QT-9
    I don't know as I am always on the alert of any rubbish in the road,
    But suppose it does happen.
    Maybe need a new pair of glasses hahahah
     
    Rickard Pingol likes this.

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