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Project Project 162 - RC162 replica

Discussion in 'Your 250cc Projects' started by jmw76, Jan 20, 2019.

  1. jmw76

    jmw76 Well-Known Member Premium Member

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    Found the oil leak. Incorrect o ring seals on oil line that feeds the cam gear. section width should be 2.2mm but 2.0mm fitted.:mad::mad::mad::mad:
     
  2. jmw76

    jmw76 Well-Known Member Premium Member

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  3. Andych

    Andych Senior Member Premium Member

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    Pity as it sounds really nice... well done.
     
  4. jmw76

    jmw76 Well-Known Member Premium Member

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    Now which track weapon do I choose today? DSCF4983.jpg DSCF4985.jpg
     
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  5. T M Fulcher

    T M Fulcher Active Member

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    Any more news of this awesome replica? have you got the jetting sorted out?
     
  6. jmw76

    jmw76 Well-Known Member Premium Member

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    Hi Guys,
    There is a chance that I will get back to Broadford around Australia day (25 Jan) for a second shakedown.
    Since the first run, I have gone up a couple of jet sizes on the main jets as I suspected it was a bit lean.
    I have also made up a set of larger "muffler inserts". These just take the edge of the noise with the open megaphones and I am hoping that will be enough to satisfy the noise police without loosing as much performance while keeping as much of the charateristic sound as possible.

    IMG_20191026_224635.jpg


    I also upgraded the rear shocks. I have tried to maintain the period look using modern gas filled shocks while adding the ability to better adjust the setup.


    IMG_20191113_114435.jpg
     
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  7. T M Fulcher

    T M Fulcher Active Member

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    Beautiful.
     
  8. jmw76

    jmw76 Well-Known Member Premium Member

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    After almost 12 months now, complicated by COVID lock down, I am now heading back to the track for another shakedown session with my little RC replica.
    As a bit of refresher for everyone, take a look at this compilation video recently put together by Bruce Walley. There is a little more video footage that Bruce had previously not posted.

     
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  9. jmw76

    jmw76 Well-Known Member Premium Member

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    Ok. Went round to see Frank today and had a bit of a chin wag. Frank got stuck into me for not posting any feedback after the RC162s 2nd outing last week. So here is a bit of a run down.
    Started the day running larger jets in the carbs compared to last time. Also running softer springs on the vacuum diaphragms.
    The theory from last time being that it was starving for fuel as the carbs were not running their best without an airbox.
    I spoke to another friend who suggested that maybe the vacuum pistons were not lifting fully (he had similar experience with MC19 carbs), hence the lighter spring idea.
    That didn't work, pick up on throttle was horrible. Went back to the original springs. Much better. Now I am getting a reasonable level of acceleration enrichment again.
    Confirmed that the pistons are opening fully as I can see down the carbs when belting down the back straight after a quick glance down at full throttle.
    Bike still feels lean as it will not rev out when cold but improves as it warms up.
    Usable revs past 18k now so a big improvement. Went up another 2 jet sizes but absolutely no change. Now thinking that the needles are sitting too low and limiting max fuel flow. Will need to shim the needles a bit for next time out. No time left in the day to sort this one out.
    The new Chinese rear shocks worked a treat. The bike feels so much more stable and controllable. Noticed a bit of instability under hard braking towards the end of the day as I was pushing the bike harder. Dialed in 6 more clicks of rebound on the rear and that helped heaps.
    So at the end of the day, the bike was feeling much better and I was getting more confident on the skinny rubber.
    Next time out I will play with the needle settings a bit more and also run some new equal length velocity stacks to try and push peak torque up a bit more rather than the softer spread from the unequal length ones.

    Sorry not many pics from the day. Too busy riding and tuning.

    img_20201113_172520.jpg

    Old meets new. My RC162 rep, my sons 88 GSXR750 and a friends CBR600RR at Broadford.

    We all had fun and no bike or rider issues to speak of as such.
     
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    Last edited: Nov 19, 2020
  10. jmw76

    jmw76 Well-Known Member Premium Member

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    New nylon velocity stacks for the next time out.
    IMG_1574.jpg IMG_1576.jpg
     

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