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Project FZR250 project

Discussion in 'Your 250cc Projects' started by neoncrypnid, Mar 1, 2020.

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  1. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    I'm thinking the cheapest reg/rec solution is to look for a used MOSFET one off a wrecker bike, since the efficiency and reliability seems way better. The fact that the bike starts well on 3 cylinders is making diagnostics annoying, but the carburetor is still the main suspect. These downdraught carbs are complex compared to basic round slide thumper ones
     
    neoncrypnid, Jul 6, 2020
    #141
  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Yes, do that. As for the carbs, you checked the diaphragms?
     
    maelstrom, Jul 6, 2020
    #142
  3. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Yeah they all move when i give it throttle. And they return back fine too
     
    neoncrypnid, Jul 6, 2020
    #143
  4. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    I've found some decent reg/recs on ebay. FH020aa seems to have the most info and a secondhand one from an R1 is $120, but a FH010ba from a zx14 is only 30 bucks? Obviously I'd rather spend 30 than 120, but I cant find a datasheet or anything for it and I wanna be sure its a MOSFET. So does anyone know if the 010ba is a MOSFET and gunna work or should i fork out on the 020aa?
     
    neoncrypnid, Jul 8, 2020
    #144
  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    ruckusman, Jul 8, 2020
    #145
  6. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Yes I did find that page but nothing on the FH010ba
     
    neoncrypnid, Jul 9, 2020
    #146
  7. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I am 99% sure the FH010 are the mosfet type, there are a few mosfet reg/rect's that style
    SH775, FH008, FH009, FH010, FH012, FH020, FH847 etc, the last few letter's are different version's some have different plug's etc
    The most common one's use the Furukawa QLW250 series plug's

    [​IMG]
     
    my67xr, Jul 9, 2020
    #147
  8. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, Jul 9, 2020
    #148
  9. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Thanks i went and ordered the mosfet one. I'm planning to swap it over to my dirt bike for a long adventure ride sometime next year so worth the bit extra imo
     
    neoncrypnid, Jul 9, 2020
    #149
  10. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Carbs are off yet again and i hope I've found my problem this time. One of the air jets, idk the exact name, had carb cleaner pooled in it and wasnt draining. Also it was cylinder 4s carb. Bit of wire poked through and spraying directly and it began flowing again... So I'm really hoping that was it
    20200711_123512.jpg
     
    • Like Like x 1
    • Nice Work Nice Work x 1
    neoncrypnid, Jul 11, 2020
    #150
  11. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    What dirt bike do you have ?
    Most of them use 2 phase reg/rect's
     
    my67xr, Jul 11, 2020
    #151
  12. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    A DRZ400E. Its a relatively common upgrade according to thumpertalk
     
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    neoncrypnid, Jul 11, 2020
    #152
  13. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    I'm kinda out of ideas with this one cylinder. Put the carbies back on and still nothings happening. Plug is dry after running for a couple of minutes at different levels of throttle and choke. But i can't find anything wrong with the carburetor, everything is clean and has holes where its meant to. Also bench synced. Any ideas?
     
    Last edited: Jul 11, 2020
    neoncrypnid, Jul 11, 2020
    #153
  14. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Fuel level checked?
     
    ruckusman, Jul 11, 2020
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  15. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Yes, I didn't measure them exactly, but i compared them to all the others. Might be worth a double check though
     
    neoncrypnid, Jul 11, 2020
    #155
  16. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Sometimes the carb passageways are very blocked, the best way the clean them is to strip the body and stick it in an ultrasonic cleaner with hot water and some dishwashing liquid or similar.
     
    Linkin, Jul 11, 2020
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  17. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Fuel levels are the same, double checked that so i don't think its that. I tried running it at about 6krpm and then pulled the plug and it was dry. I know the main jet and needle jet circuit is clean for sure, i stuck some wire all the way through, so could the idle circuit be clogged? When does the bike start running off the needle and not the idle circuit?
     
    neoncrypnid, Jul 11, 2020
    #157
  18. jmw76

    jmw76 Well-Known Member

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    The carbs start running on the needles as soon as you start to open the throttle. You can often see a fuel spray/mist emitting from the top of the needle jet as you blip the throttle and the slides lift.

    Are you sure it is still not electrical? I only ask as I was chasing a miss on my CBR900RR earlier today. #1 was not firing. Exhaust header cold to touch after a few seconds of running. Plug was blackish (seen worse) but it measured open circuit on a meter. When I connected it up the plug lead (out of the motor) with the case grounded, there was spark visible but not across the gap. It was sparking across the carbon on the insulator nose. A good clean and bingo, working again.
     
    • Informative Informative x 1
    jmw76, Jul 11, 2020
    #158
  19. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Im not ruling electrical out completely but I've replaced the plug, swapped caps and it sparks, at least outside the engine
     
    neoncrypnid, Jul 11, 2020
    #159
  20. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    If the needle has an effect straight away wouldn't there be at least some fuel on the plug after running at 6k~ rpm if that jet was definitely clean?
     
    neoncrypnid, Jul 11, 2020
    #160
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