1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Project Been shopping ... 1988 MC-19

Discussion in 'Your 250cc Projects' started by Murdo, Aug 17, 2016.

  1. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,397
    Likes Received:
    4,785
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    Have the spare engine apart now and photos to show how easy they come apart. Everything stays in the top case until your ready to remove it. Undo conrod bolts and slip pistons out the top. Easy. :D
    zzz 003.JPG
    These next photos are why you don't leave engines outside during rain. You can see the rust pits in the bores, would not have done the compressions any good (they weren't, about 40psi) and the last one has two deep scratches from a bit of dirt or metal scraping up and down with the piston.
    zzz 004.JPG zzz 005.JPG zzz 007.JPG This gearbox mainshaft bearing is stuffed. It had been installed (the engine has been apart before) with the seal still in it on the oil feed side, no wonder it's shagged.
    zzz 008.JPG
     
    • Like Like x 1
    • Agree Agree x 1
  2. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,397
    Likes Received:
    4,785
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    To the drag races last weekend with the purple bike. Still not a lot of bikes, 3 R1s, ZX10, YZF450 motard, my CBR250, CR250, and of course there has to be one Hardly (new sportster).
    Ran best of 10.95 @ 100.00Kmh on the Saturday (only change had been the pipe/muffler) . I changed the cdi for the new 'unrestricted' one, but the timing failed and didn't get another run that day to compare.
    Sunday's first run was 10.58 @ 101.85 and the engine definately felt to pull better from about 9000. Unfortunatly I was run out in the first round with 10.75 on a 10.50 dial in. The other rider (R1 yamaha) got to the line 0.078 seconds quicker than me. My best reaction time was 0.026 with 60ft down to 2.30. So little improvements, but a heap of fun.
    On the Sunday my son brought his 2006 CR250 (still with motorcross knobbies) to join me and he surprised me by doing a best of 8.90 @ 126kmh and got through to the semi finals winning by 0.018sec. He unfortunately had a bit of a fuel hick-up and got run out by another R1.
    drag races 002.JPG drag races 003.JPG
     
    • Like Like x 4
    • Nice Work Nice Work x 2
  3. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,397
    Likes Received:
    4,785
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    Poor showing of bikes this weekend (hot weather, predicted rain (it didn't) and harvesting time) with only four showing up. R1, Kawa 1000, Hardly sportster (a sporting Harley? :idk:) and my little CBR. Ran a PB of 10.07 @ 109.60Km/h with my best reaction time of .002 (we wont mention the two red lights :oops:) and 60ft of 2.27 sec. Had eight runs Saturday and six Sunday, so got my moneys worth.
    Next meeting in March 2018.
     
    • Winner Winner x 2
  4. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Sweet , good effort Murdo
     
    • Like Like x 1
  5. risky

    risky risky

    Messages:
    4,555
    Likes Received:
    1,177
    Trophy Points:
    923
    Joined:
    Nov 4, 2012
    Gender:
    Male
    Occupation:
    risky by name AND actions
    Location:
    newcastle,australia
    My Bike:
    honda ca77, megelli x2,fzr yamaha x 5 ,maxim,cb750.cb600 hornet,zxr250,marusho magnum electra.
    next march a honda mc19 and a yamaha 2kr,too old bikes ridden by 2 old codgers.pear cider to the winner?
     
  6. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    You should be fine risky, no corners :thumb_ups:
     
    • Funny Funny x 2
    • Winner Winner x 1
  7. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,397
    Likes Received:
    4,785
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    As part of my improvements to the drag bike I decided to try two teeth off the front sprocket. Std is 17 tooth and the only one available in 428 chain size. I could have gone smaller by converting to 520 chain and using sprockets from other Honda's but didn't want to lose HP with the heavier chain and would have to buy new rear sprocket as well.
    Years ago I did a cut and swap with two sprocket on my Maico to get the one I wanted and it is still going now (although well worn) so I decided to do the same for the CBR. I had a worn standard 17 tooth, so went the bike shop and got a cheap 15 tooth from a Honda CT200 and spent a couple of hours in the shed.
    First I heated both sprockets to red hot and buried in the sand bucket to let them slowly cool to soften them. I then cut the teeth off the CBR sprocket and the centre out of the CT sprocket and welded them together with the TIG. xxx 006.JPG
    Note the large bolts in background that I used to hold the sprockets centred whilst machining.
    xxx 007.JPG
    Welded and cleaned up in the sandblaster to get the heating and welding scale off.
    xxx 008.JPG
    I then heated the finished sprocket to red hot again and dropped into a tin of old oil to cool. This hardened the metal and when cooled I cleaned up and slowly heated until the colour changed and dropped into a bucket of water to temper the sprocket. Doing this made the metal hard enough to resist wear, but not brittle enough to crack. Cleaned again in the blaster and ready to fit.
     
    • Nice Work x 4
    • Winner x 2
    • Well said! x 2
    • Like x 1
    • Looks good! x 1
  8. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,397
    Likes Received:
    4,785
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    The clutch cover gasket I had been waiting for arrived today. Fitted and filled with oil, primed the fuel pump and after a couple of winds fired into life. Sounds healthy with no noises but have a water leak from around the thermostat that will require the airbox off again to tighten the clamps to hopefully stop the drip. Keen for a cool day (less than 30C) to give it a run.
     
    • Like Like x 2
  9. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

    Messages:
    3,979
    Likes Received:
    2,207
    Trophy Points:
    923
    Joined:
    Nov 19, 2013
    Gender:
    Male
    Occupation:
    Gardener
    Location:
    Tasmania
    Home Page:
    My Bike:
    Spada, VT250F & ZX2R
    Is this the rebuilt engine with oversize pistons and head work?
     
  10. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,397
    Likes Received:
    4,785
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    Yep.
    Found the leak and trimmed the end of the hose, all good now.
    A person with an FZR who wants to race me has heard it running and is getting worried now. :lolsign:
     
    • Funny Funny x 2
    • Like Like x 1
  11. risky

    risky risky

    Messages:
    4,555
    Likes Received:
    1,177
    Trophy Points:
    923
    Joined:
    Nov 4, 2012
    Gender:
    Male
    Occupation:
    risky by name AND actions
    Location:
    newcastle,australia
    My Bike:
    honda ca77, megelli x2,fzr yamaha x 5 ,maxim,cb750.cb600 hornet,zxr250,marusho magnum electra.
    motor sounded healthy but some hydrazine might make up the hp difference or some start line cunning.murdo has red lighted more than once.lol
     
  12. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

    Messages:
    3,979
    Likes Received:
    2,207
    Trophy Points:
    923
    Joined:
    Nov 19, 2013
    Gender:
    Male
    Occupation:
    Gardener
    Location:
    Tasmania
    Home Page:
    My Bike:
    Spada, VT250F & ZX2R
    I don't blame him for getting worried. My guess is the CBR will run low 9's given the work you've done on the engine/head, lower gearing and the unrestricted CDI. Maybe even a high 8 if you can take some ballast out of it :)
     
  13. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    Hey Murdo

    Loads of people are putting mc22 carbs on their mc19 and reporting good gains in mid and top end , cmihjt be a worthwhile update for your bike

    Kiff
     
    • Like Like x 1
    • Informative Informative x 1
  14. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,397
    Likes Received:
    4,785
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    After Xmas ballast has increase, have a couple of months to reduce it before drags. :lolsign:
     
    • Funny Funny x 1
  15. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,397
    Likes Received:
    4,785
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    What is the difference to the -22 carbs?
     
  16. kiffsta

    kiffsta Senior Member

    Messages:
    9,066
    Likes Received:
    6,872
    Trophy Points:
    1,168
    Joined:
    Aug 7, 2010
    Gender:
    Male
    Location:
    Brisbane
    They are allegedly a much better carburettor , but I can’t give you the scientific answer, the mc22 carbs, airbox for under the tank , you also need cables , throttle tube etc
     
  17. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,397
    Likes Received:
    4,785
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    Thanks Kiff, will keep in mind.
     
  18. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,397
    Likes Received:
    4,785
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    1937 Royal Enfield 250, CF Moto 250 V5, Honda's XL250, CBR250, FT500 plus a few others.
    Starting with my original setup and doing mid 11's, I've now got down to a weekend best of 9.65. Quite acceptable for a basically stock MC-19 with 100Kg of 'ballast'. :D
    It is reliable, doesn't leak any fluids, starts first go and idles smoothly, easy to maintain and is exactly what I wanted to achive.
    I have sold the good MC-19 and have only the drag bike and an MC-14 to be restored.
     
    • Winner Winner x 2
    • Nice Work Nice Work x 2
  19. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

    Messages:
    3,979
    Likes Received:
    2,207
    Trophy Points:
    923
    Joined:
    Nov 19, 2013
    Gender:
    Male
    Occupation:
    Gardener
    Location:
    Tasmania
    Home Page:
    My Bike:
    Spada, VT250F & ZX2R
    Well done Murdo. 9.65 in those conditions would have been a 9.3 with the right weather. Looking forward to seeing how quick the little CBR goes in May or August races when the air will be much better.
     
    • Like Like x 1
    • Agree Agree x 1
  20. risky

    risky risky

    Messages:
    4,555
    Likes Received:
    1,177
    Trophy Points:
    923
    Joined:
    Nov 4, 2012
    Gender:
    Male
    Occupation:
    risky by name AND actions
    Location:
    newcastle,australia
    My Bike:
    honda ca77, megelli x2,fzr yamaha x 5 ,maxim,cb750.cb600 hornet,zxr250,marusho magnum electra.
    and watch how that green projectile howls and can lightening frank cut the xmas tree closer???
     
    • Like Like x 1

Share This Page