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Project MC22 streeee... nah

Discussion in 'Your 250cc Projects' started by crzie, Sep 19, 2020.

  1. crzie

    crzie Member Premium Member

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    Hi all!

    Great that a forum like this still exists! I’ve just purchased a MC22 last week and am slowly working through its little issues. Eventually I would like to street fighter it, there’s a bike on google called fighter blade and it looks pretty cool, so that’s my inspiration for this bike which will be my daily, weekend and track bike.

    Off the bat the steering had some play over bumps, steering lock nut was a little loose, which has now been tightened and now it’s happy days!

    Next is the throttle response, it doesn’t feel as responsive as it should be there’s a slight lag on acceleration (btw 6-8k rpm) and doesn’t feel that it breathes good in higher revs. I feel it’s not set properly, last owner said they cleaned the carbs, changed the boots, but didn’t balance or play around with the jets or settings and was wondering if anyone had tips for base line settings and carb balancing for a bike that lives in Sydney?

    CDCB130F-E2A5-4F8D-A128-EE789BA63596.jpeg
     
  2. Kyle De Lange

    Kyle De Lange Member Premium Member

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    You might find some inspiration from this build. http://666250rr.blogspot.com/

    Welcome and best of luck! I don't have any advice to offer with carby issues, trying to sort my own out first...
     
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  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Welcome to the forum
     
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  4. jmw76

    jmw76 Well-Known Member Premium Member

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    They are a great little bike. Lots of fun on road and track. You just need to understand that it is only a 250.
    But, in the right hands they are quick on tight twisty tracks. Not so much fun at places like Phillip Island.
    With the carbs, I would first check to see what settings you currently have. Are the jets still standard or has someone changed them in the past. Check to make sure that you have no air leaks around the boots that join the carbs to the head. Make sure all the vacuum take off points are sealed up or go where they are supposed to (fuel tap). How many kms has the bike done? What year/model is it? What air filter are you running and is it in good condition/clean? Is it running the standard air box (complete with the spark arrestor plate under the filter)? Have you done a compression test on the engine? Do you need to use choke when it is started cold? Post a video so that we can hear how it runs and idles?
     
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  5. jmw76

    jmw76 Well-Known Member Premium Member

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    And...... Welcome.
     
  6. jmw76

    jmw76 Well-Known Member Premium Member

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  7. crzie

    crzie Member Premium Member

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    Good to be here!

    here’s the link to the fighter blade I found, pic attached
    http://www.streetfighters.com.au/forum/showthread.php?3204-FighterBlade-s-CBR250RR-what-do-ya-think

    I’ll get around to checking the carbs once I get my garage space back. To my knowledge the boots to the head have been replaced, will need to check the jets, settings and air leaks.

    Bike’s a 90 model I think, 45k kms, standard air box, will need to check the filter. Haven’t done a comp test but engine starts when cold, it’s just a little laggy when accelerating, I feel.

    661291A8-D98F-457D-8FC5-55AD7EE81AE0.jpeg
     
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  8. crzie

    crzie Member Premium Member

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    This just made me realise that I shouldn’t start another project... might just leave it as stock for the moment, fix it up and enjoy it.
     
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  9. crzie

    crzie Member Premium Member

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    thanks for this link, that’s a really nice bike, that polished frame and that silhouette front cowl is tits as well!
     
  10. jmw76

    jmw76 Well-Known Member Premium Member

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    Although that little fighter doesn't look too bad, I think you will find resale value will be much better if you leave it as close to stock as possible and spend your time fixing it up so that it goes well and enjoy riding it. An unmolested early 90s model is most desirable.
     
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  11. jmw76

    jmw76 Well-Known Member Premium Member

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    At 45,000 km you will probably find that compression is ok. Provided it has been looked after. You might find a simple adjustment of the idle mixture screws and a carb sync might be enough to make it feel that bit more responsive. They do need revs to make them go. They have not got the same level of bottom end torque as a 250 with fewer cylinders. Give it some revs and they reward in spades for a little bike.
    With no engine work and just careful set up on a dyno you can easily get well over 40 hp at the back wheel. My little track bike knocks out 42 at the wheel. Not too bad for a 28 year old bike.
     
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  12. crzie

    crzie Member Premium Member

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    I bought it to be my daily do everything bike and I have an Aprilia RS125 which has been my project bike for the last 4 years...

    So will take your advice and just leave it, I’ll fix the teething issues and will just enjoy it as it is.

    the 250 is more than enough power for me, I’m only 60kg so it’s plenty fast
     
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  13. jmw76

    jmw76 Well-Known Member Premium Member

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    My 250s seem to haul my 75kg (well over 80 with my gear on) frame around ok.
     
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  14. crzie

    crzie Member Premium Member

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    They’re great little machines aye!

    https://vimeo.com/460966562

    Here’s a video of it from a cold start, I don’t have to use the choke. I took it for a spin today and was alright, still feel that slight lag but not sure if it’s just me or if there’s something wrong with the bike
     
  15. jmw76

    jmw76 Well-Known Member Premium Member

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    The fact that you do not need choke when it is cold is an indication to me that it is a bit rich. It should not hunt like it does at idle either. Otherwise it sounds ok. It should sound smooth rather than that low frequency rythmical beat. Again, I suspect mixture is not quite right.
    Check air cleaner. Is it clean? Are the jets the standard size? what size are they? What clip position/how many washers on the needles? Did you sync the cars? Where are the idle mixture screws set? How many turns out?
     
  16. crzie

    crzie Member Premium Member

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    Haha I have so much to do! Haven’t got round to what you’ve suggested yet.

    I will put the stock muffler back in and see if that helps anything and then when I get around to checking everything you’ve said, will make a new post with my findings
     
  17. crzie

    crzie Member Premium Member

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    Anyone here have the KKK Product preload adjusters? My suspension feels a bit spongey and I wouldn’t mind adding the adjustability when I rebuild.

    What other fork tuning things can I do?
     
  18. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    Replace the fork oil for a start
     
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  19. crzie

    crzie Member Premium Member

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    Yep that’s what I’m planning, what else do people do?
     
  20. jmw76

    jmw76 Well-Known Member Premium Member

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    Replace the fork oil with heavier stuff. I run 15w in mine. I also use preload adjusters to set the sag and ride height. If you are really keen, there are Racetech spring upgrades you can get.
     
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