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Project MC18 Project - Brisbane

Discussion in 'Your 250cc Projects' started by Duggs63, Jul 26, 2013.

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  1. Fox McScrooge

    Fox McScrooge Well-Known Member Premium Member Contributing Member

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    I wouldn't say guru mate. I'm only repeating a lot of what I have read etc. There are guys on here like Scotchy and Neal that have forgotten more about 2 stroke tuning than I know. Dyno work cost me about 400 from memory but it was definitely worth it as I had just completely rebuilt the engine.

    I'm keen for the NSR day too Briz. I'm off to work on the 2nd June and will be back on the 1st July for 4 weeks. Hopefully by then my PGMs will be back from Japan with new keys otherwise I'm stranded. Be good to get Kiffsta out on his RS and any other 2 bangers as well.
     
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    Fox McScrooge, May 26, 2015
    #101
  2. Brizfox

    Brizfox Well-Known Member Premium Member Contributing Member

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    Ok Ill hold you to that. 2nd week in July it is then. I might have the other NSR up and runnung by then and hopefully it will look like this.

    Nsr 250 HB.jpg
     
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    Brizfox, May 26, 2015
    #102
  3. Mclaren

    Mclaren Well-Known Member Contributing Member

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    @Duggs63 motorcycle mad have Dyno day this sat $50 bucks one run u get print out with air fuel plus if more than15 ppl book one person can win a free tune(t&c apply) least this will give u an idea and it cheap

    Full tune worth around 400 as well these guys did my race bike and it runs mint now!

    mad.jpg
     
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    Mclaren, May 26, 2015
    #103
  4. Duggs63

    Duggs63 Well-Known Member

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    Thanks McLaren. I will try and get down to Brendale on saturday.

    Looks great @Brizfox ! If you bring an MC21 we will have the full set (I don't know anyone with an MC16). Definately have to see if @kiffsta is available too, and any other strokers that are getting around on the forum :)
     
    Duggs63, May 27, 2015
    #104
  5. Brizfox

    Brizfox Well-Known Member Premium Member Contributing Member

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    WP_001371.jpg I have a MC 16 but because the fairing was so bad I ended up putting a MC 18 one on it.
     
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    Brizfox, May 27, 2015
    #105
  6. kiffsta

    kiffsta Senior Member

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    Didnt think it would fit, I thought the MC18 was a complete redesign, in saying that... it looks quite good
     
    kiffsta, May 27, 2015
    #106
  7. Brizfox

    Brizfox Well-Known Member Premium Member Contributing Member

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    WP_20150130_20_03_47_Pro.jpg
     
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    Brizfox, May 27, 2015
    #107
  8. kiffsta

    kiffsta Senior Member

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    and that looks even better
     
    kiffsta, May 27, 2015
    #108
  9. Duggs63

    Duggs63 Well-Known Member

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    Good stuff! It is a shame you can only ride one at a time :p
     
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    Duggs63, May 27, 2015
    #109
  10. Duggs63

    Duggs63 Well-Known Member

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    Booked a spot for the dyno day tomorrow. If you gents are free, you should stop by around 11:30
     
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    Duggs63, May 29, 2015
    #110
  11. Brizfox

    Brizfox Well-Known Member Premium Member Contributing Member

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    Where.
     
    Brizfox, May 29, 2015
    #111
  12. Duggs63

    Duggs63 Well-Known Member

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    See above briz. Johnstone rd Brendale
     
    Duggs63, May 29, 2015
    #112
  13. Duggs63

    Duggs63 Well-Known Member

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    So the cause of the miss fire was this little guy... 20150530_135358.jpg

    After its session with the workshop down the coast, it was determined that the power valve motor isnt working, so they were set to full open, and one of the air solenoids wasn't working which has since been fixed.

    After all of this, i popped down to the motorcycle mad dyno day today to see what it did on the dyno, and the results weren't quite as good as I had hoped.

    20150530_135443.jpg
     
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    Duggs63, May 30, 2015
    #113
  14. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    A bit of a far cry from 40/45HP isn't it? I would suggest a top end rebuild. New piston rings, gaskets, and a good clean up all around.
     
    Linkin, May 30, 2015
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  15. Brizfox

    Brizfox Well-Known Member Premium Member Contributing Member

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    That is a bit of a let down. I'll PM you my address, I'd like to take a look at it.
     
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    Brizfox, May 30, 2015
    #115
  16. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Yer think so work needed mate but good to get a base point to work from
     
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    Mclaren, May 30, 2015
    #116
  17. Duggs63

    Duggs63 Well-Known Member

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    Thanks briz. That would be much appreciated.

    I am going to check a few things before i jump into a top end rebuild. The fact that the compression is good on both cylinders gives me hope.
     
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    Duggs63, May 30, 2015
    #117
  18. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Running lean aswell
     
    Mclaren, May 30, 2015
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  19. Fox McScrooge

    Fox McScrooge Well-Known Member Premium Member Contributing Member

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    Be interesting to see exactly where those power valves are set Duggs. There is information on NSR world for setting them. I think they have the full open position measurements. Makes a big difference to the performance. The valves not cycling could be the power valve motor or the PGM. If the valves get carboned up it's very common to get PGM damage. Be worth pulling the valves out for a clean up in any event. I have a tool for extracting the valves on the 21/28 which is no easy task if they have carbon buildup. Not sure if it works with the 18.

    As McLaren said it looks like it is running lean as well. Especially below 8k if the graph is correct. Way lean below 8k. Could be partly due to the power valves being fully open when they are meant to be partly shut lower in the rev range. I think you probably need bigger main jets as well. I'd be wary riding the bike like that.
     
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    Fox McScrooge, May 31, 2015
    #119
  20. Duggs63

    Duggs63 Well-Known Member

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    Thanks fox. The power valves are my first port of call, but I am away this week for work so won't get anything done for a little while at least.

    They guys in the shop reckon they went to #125 mains but I might invest in afew bigger sets for piece of mind. Is tyga the best place to get them?

    When I am back I intend to pull the plugs out too and see what colour they are which will also help I think.

    They got those AFRs from 2 probes stuck in the mufflers on the dyno. Are these particularly accurate on 2-strokes?

    The little beast isn't going anywhere at the moment as it isn't registered so hopefully no damage done... Touch wood...
     
    Duggs63, Jun 1, 2015
    #120
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