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Project FZR250 2KR 3HX1 resto-1project

Discussion in 'Your 250cc Projects' started by BlackBladeDesign, Aug 2, 2018.

  1. BlackBladeDesign

    BlackBladeDesign Running rich Premium Member

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    What's the reason for 15w 40/50 rather than the spec 10w 30/40(can't remember which, it's written under the filler cap)? does the thicker viscosity make any noticeable differences? Does it foam less etc?
     
  2. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Nah it's just what they sell, and is good for the price, they do have Castrol 10W40 Power 1 GPS but it's almost twice the price
    The 50 part mean's it has to be at least a 50 grade viscosity @ 100° C
    Generally you can go 1 range higher or lower without doing any damage

    Using a lower viscosity oil mean's it'll flow a bit easier, a lot of new car's etc run a lower viscosity oil to help reduce friction and with modern engine's the clearance's are smaller, thinner oil transfer's heat better than thicker and it help's with fuel economy due to less friction

    Higher viscosity oil's help keep oil pressure up in higher mileage car's and bike's, and help's older engine's by compensating for wear and bigger bearing clearance's etc.

    I wouldn't use the 50 grade if my bike had low km's, but mine has 60,000km's on it now
     
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  3. BlackBladeDesign

    BlackBladeDesign Running rich Premium Member

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    So being that the mileage is unknown, but it can be assumed(due to the overall extreme cleanliness internally) that it has been rebuilt at one point, or has had more than regular service intervals, should I just go with 10w 30/40? Or go with 15w 40 to be safe
     
  4. Murdo

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

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    Go with what the bike manufacturer recommends. They would have spent a lot of time and money designing the engine to use a certain oil, and that is what goes best. You can go a little thicker but not too much or your bike wont have the power get up hills.
     
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  5. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    The FZR250R 3LN3 Yamaha Service Manual list's ;

    10W30 for -20 degree's C up to 50 degree's C
    20W40 for -12 degree's C up to 52 degree's C
    10W50 for -25degree's C up to 60 degree's C
     
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  6. BlackBladeDesign

    BlackBladeDesign Running rich Premium Member

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    Are the slides vacuum operated? There's two (I'm pretty sure) vacuum fittings on the carby, I don't know where they connect to though. I was guessing by the design of the carby that that was how the slides function, but I don't know.
     
  7. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Yeah there vacuum operated, the 2x vent's on the front top of the carby's are vent's for the vacuum diaphram's, they have a short hose with a right angled filter on them, they're not connected to anything
     
  8. BlackBladeDesign

    BlackBladeDesign Running rich Premium Member

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    What's the firing order? (And if I'm sitting on the bike, how at the cylinders numbered from left to right?

    Picked up coils and cdi today
     
  9. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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  10. BlackBladeDesign

    BlackBladeDesign Running rich Premium Member

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    Anyone got a pic of where the coils mount up?
     
  11. BlackBladeDesign

    BlackBladeDesign Running rich Premium Member

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    Reasons for ridiculously high idle? 4-5k.
    It was sitting at around 1600(guesstimate) then it just spiked up to 4-5k and sat there
     
  12. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Too lean, possibly a vacuum leak from the intake's ?
    Start the bike and let it idle, spray some wd40 on the intake boot's,
    if the idle speed / sound changes in any way then there's a leak
     
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  13. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    You have an air leak, or it is seriously lean on the mixture screws. Try starting at 3 full turns out from lightly seated.

    Air leaks on the fizzers are simple... carb boots or airbox boots. There are no vacuum lines to deal with.
     
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  14. BlackBladeDesign

    BlackBladeDesign Running rich Premium Member

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    Thanks for the info guys, I'll try and get it right tomorrow when the neighbors aren't trying to sleep ahaha.
    I got the parts for the exup valve I was missing today and the servo. Just need some cables now(can I just use short throttle cables?)
     
  15. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    If your outer cable sheaths are in good condition, use this exup repair kit

    https://www.venhill.co.uk/u01-11-100.html

    If you don't have any cables, something off another model with EXUP should do in a pinch
     
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  16. BlackBladeDesign

    BlackBladeDesign Running rich Premium Member

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    I haven't really come across an issue like this before. It has moments where it will start and run for a while without a little bit, and other times where it's virtually impossible to get it to fire. I had it going today after taking a looking at the intake rubbers, they are old and crappy but the bike ran and maintained a steady 1600-1700 idle.

    The diaghprams aren't pinched, all the slides go up like they're meant to. I can't visibly see fuel entering any of the carby throats though.

    I'm thinking the intake valve in cylinder 4 might be worn out too, some pressure came out it at one point
     
  17. BlackBladeDesign

    BlackBladeDesign Running rich Premium Member

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    The popping sounds isn't knock by the way, the headers weren't bolted on tight enough when I recorded the video
     
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  18. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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  19. BlackBladeDesign

    BlackBladeDesign Running rich Premium Member

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    anywhere I can buy replacements for the rubbers between the carb and air box? they're really hard and virtually impossible to get on. I really don't want to put 4 crappy pod filters on it.
     
  20. Andych

    Andych Well-Known Member Premium Member

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    History in here says it wont run right if you do put Pods on... FZR250 carby setup will test your patience even when you have everything correct.. :)
    I think @my67xr managed to find some Carb to airbox rubbers.. hopefully they are easy to get...
     
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