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Project Dave Moss CBR250RR MC22 racing in California

Discussion in 'Your 250cc Projects' started by Dave Moss Tuning, Jan 19, 2016.

  1. Mngforce

    Mngforce Active Member

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    Man a video of that would be awesome. Especially with a timing light strobing away in a dark dyno room (I've done this to look at the fuel spray on top of the velocity stacks). It's extremely helpful. But my new dyno room is still being built. Probably won't be able to run anything until next year.

    Mike Norman



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  2. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    There should be I believe forum members with one of each motor from the three brands which has recently deceased motors.

    My line of thinking was that with three brands as potential candidates for the race pistons it may make locating enough orders much simpler
     
  3. Frankster

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

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    Hi Mike, I can give you a ZXR250A piston which is 48mm diameter, but you'll probably want to get a ZXR250C piston (49mm diameter) as the rings for the smaller piston are NLA and I've yet to find anyone who has bought Chinesium items that are durable. @kiffsta should have a C piston laying around, but I'll let him decide if he's keen to get involved.

    It's be good reading your posts as I drag race a ZXR250A (with C engine) and as a budget racer I am always looking for ways to get a few extra tenths without having to go on a serious diet. In your opinion is running 10W30 oil okay or will it cause problems e.g. overheating, extra wear etc? I currently run 10W40 oil.

    Cheers

    Frank
     
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  4. Mngforce

    Mngforce Active Member

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    Hi Frank:

    Let me know if you'd still be interested in sending me the A piston. If I can get a C piston, I can compare them. Send me a PM and I will get you my address.

    Also, run 5W30 fully synthetic, like Motul 300V. It will give you back some power without any concerns for wear or breakdown.

    Mike Norman


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  5. Frankster

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

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    Thanks Mike.
     
  6. kiffsta

    kiffsta Senior Member

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    I don't have a c model piston
     
  7. Frankster

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

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    Sorry Chris. Didn't mean to throw that at you. I'm going to send Mike an A piston. I'd be keen to know if Mike thinks there might be some rings out there that could be used. It would certainly prolong the life of many A model ZXR250's. No point getting OEM pistons made up if there aren't any rings for them.
     
  8. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    If you need an FZR piston , Im sure theres a few spares in the parts jungle here .
     
  9. Mngforce

    Mngforce Active Member

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    Yes. Please. If I can cover several models with one basic design, assuming the major difference is the domes, that would be great.

    Just to be clear: I wouldn't be having OEM Pistons made. I would be having very high performance (MotoGP level) Pistons made.

    But, you are right, if I can't get rings made than it's pointless. Which is why I have someone trying to get me in the door at one of the largest ring makers in the world. Fingers crossed

    Mike Norman


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  10. Frankster

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

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    Hi Mike, Sorry I didn't mean to imply anything negative by calling them OEM. Everyone in the motoring world knows of Cosworth and what they can do. I will refer to the pistons as "Cosworth Pistons" from now on.

    Cheers Frank
     
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  11. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    @MakingBacon had a deceased ZXR motor which had dropped a rod, I am unsure what became of it but he may still have it around

    BTW what would be the feasibility of getting mid grade pistons made with someone like Wiseco? Would the cost difference to quality/performance ratio make it a waste of time?

    BTW the Asian market is awash with small capacity bikes and there seems to be no shortage of both OEM and aftermarket engine components - rings amongst them. hispeedpiston.com has a lot of parts Uma racing is one brand which comes to mind as well as Takegawa which does performance parts, with right up there price tags to match, for pit bikes, mopeds and scooters
     
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  12. Frankster

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

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    Not sure if I'd compare pit bikes, mopeds and scooters to 250/4 bikes that rev to 20,000rpm, but will have a look when I get a chance. Thanks for posting details.
     
  13. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    The main thing with engines that determines whether it will go bang or not is piston velocity. 4,000 feet per minute is considered about the maximum.

    This read is car-centric but the principles are the same. There is good information elsewhere on that site

    http://www.billzilla.org/2v4v.htm
     
  14. Mngforce

    Mngforce Active Member

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    Hi Frank. I'm actually looking at using a different company for these. Maybe.

    Mike


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  15. Mngforce

    Mngforce Active Member

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    If you want to put together a price-conscious engine, spend more money on Pistons and rods. Otherwise, you get what you pay for.

    Mike Norman


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  16. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    @Mngforce Yes I figured as much, not spending the $$ on the parts which need to remain intact is going to cost more in both the short and long term.

    Are you going as far as contemplating titanium rods?
     
  17. Mngforce

    Mngforce Active Member

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    Can anyone get me part numbers for pistons and rings in each of the sizes available? I don't know the best place to get those part numbers from here.

    Cheers.

    Mike Norman
    G-Force Engine Development
    www.mngforce.com
    There is no such thing as "Too Fast"
    upload_2016-11-21_15-8-11.png
     
  18. Frankster

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

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    Mike. Quick question...is 300V suitable for wet clutch (Motorcycle) applications?
     
  19. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Yamaha 3LN piston's

    FZR250 3LN1 piston
    3LN-11631-00 std
    3LN-11636-00 .50mm OS
    3LN-11638-00 1.00mm OS

    3LN3, 3LN5 piston
    3LN-11631-01 std
    3LN-11636-01 .50mm OS
    3LN-11638-01 1.00mm OS

    3LN6, 3LN7 piston
    3LN-11631-02 std
    3LN-11636-02 .50mm OS
    3LN-11638-02 1.00mm OS

    FZR250 3LN1, 3LN3, 3LN5, 3LN6, 3LN7 Ring's
    3LN-11610-00 STD
    3LN-11610-20 .50mm OS
    3LN-11610-40 1.00mm OS
     
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  20. Frankster

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

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    Scratch that question. I found my answer.
     

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