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Project Project SRX250

Discussion in 'Your 250cc Projects' started by edwardo, Apr 5, 2020.

  1. edwardo

    edwardo Well-Known Member Contributing Member

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    All good thanks for checking :)
     
  2. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    I checked mine as well today.. and the smallest I have is 255. I remembered that the guy who re-built my 350 head ended up having to grind the tops of the valves and still but some 230 shims to get it in the right range.
    He bought the shims from Precision Shims so you should be pretty right buying from them...

    Sorry I couldnt help
     
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  3. Oigy

    Oigy Owner of many bikes, keeper of few :(

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    I managed to get a couple from my local bike shop, seems they are used in a few bikes, the rest I got ok from precision Shims as well, good service if a bit pricey :(
     
  4. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Direct from Yamaha they are a little cheaper than Precision shims but they very rarely have the lower number shims... worth checking though. If they can get them just order tham and they should be there in a few days... generally speaking.
     
  5. edwardo

    edwardo Well-Known Member Contributing Member

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    Thanks guys. Ended up grabbing some from precision shims. Yeah definitely a bit pricey. Also paid for standard postage and it's been a week, bit slow! C'mon auspost!

    Re master cylinder does anyone know if either of these kits would be useful on an srx? I messaged the seller but didn't get an answer. Unfortunately I've packed all my shed up ready for the move so I can't get to it atm.
     

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  6. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Impossible to tell really... the correct part number is 23L-W0041-00-00
     
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  7. edwardo

    edwardo Well-Known Member Contributing Member

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    Yeah long shot I know hoping on the off chance someone might have used one before. Will just do it right with the correct part number. Cheers!
     
  8. edwardo

    edwardo Well-Known Member Contributing Member

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    Gee where has the year gone? Barely had any time to spend on the bike lately however with school finished and moving complete I am starting things back up!

    First things first - set up the garage. It's 7 x 2 m bit of an odd size. Anyone have any ingenious space saving tips?

    Pretty much have everything to finish the bike now. After garage is finished it'll be carbs, wiring, controls and cables etc etc. Still a lot to do.

    On another note I sourced fzr front forks with wheel. I also bought a caliper bracket and rear mc to see if I could convert drum to disc keeping the same swingarm. Will measure it all up soon and see if it's possible.

    Peace!
     

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  9. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Tight space but should be workable...
    Which FZR front forks are they? Twin disc?
    If it is 3LN1 then it will bolt straight up to the frame... the difficulty you will have is with the instrument binnacle etc as the top triple clamp is entirely different and the fork diameters are different as is the offset and pitch.
    You will need to source an FZR front guard or adapt the SRX... not too hard.
    As for the rear... hmm did you get the caliper and the caliper bracket? You wont be able to use the FZR caliper bracket as I dont think it fits into the Swing arm (going from memory here).
    What I would do is try and get the SRX250 3WP rear caliper mount and have your swing arm modified to accept it... they bolt onto the swing arm where the FZR uses the axle and lugs on the swing arm to hold it in place.
    You will then need to modify the brake pedal to actuate the rear master cylinder and mount a bracket on the frame for that and the reservoir...
    All do-able, just takes time and perseverance..
     
  10. edwardo

    edwardo Well-Known Member Contributing Member

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    I haven't clapped eyes on it in person but pics from seller showed it was twin disc. Luckily have a few spare mudguards so should be sweet there. As for instruments I was planning on using something aftermarket and make up a bracket. We'll see.

    Yes it is a 3wp bracket purchased from Japan via zenmarket. Should be interesting seeing how it all fits up, will definitely post more info on it once it's done (or once I give up on it lol)

    Cheers for the info
     
  11. edwardo

    edwardo Well-Known Member Contributing Member

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    Went to work on the carb and turns out I have the wrong needle. Also thought I could just chuck some hose where the two carb bodies meet and slap a spring clamp on it but they are actually really tight and prob won't fit. Could use og wire clamp but we'll see. Some of the hoses are available from Yamaha ($10ish) some are no longer available. Would rather not pay that kind of money for literally 2cm of hose lol

    Also seem to be missing an O ring for the float bowl. Carb kit has a few spare o rings but they look a bit small.
     

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  12. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    A few pics to show you how the 3WP rear disc mounts up etc.
    Here you can see how the mount is part of the rear wheel spacer....
    UNADJUSTEDNONRAW_thumb_1bb6.jpg
    Here you can see how it is mounted to the Swing arm and you can also see the caliper.
    UNADJUSTEDNONRAW_thumb_1bb8.jpg

    Last one is showing the mounts for the master cylinder. I just added Rivnuts to the bracket today.
    UNADJUSTEDNONRAW_thumb_1bbb.jpg

    The rim I am using is from an FZR250 3LN1.
     
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  13. edwardo

    edwardo Well-Known Member Contributing Member

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    Thanks for those pics, heaps of detail, sometimes hard to find online! Will def come in handy.

    I'm assembling the carb now. Bit of a run around trying to find the right sized fuel hoses. Also had trouble with the new needle I bought, didn't seem to fit the seat from my other kit so used the seat that came with the new one. Slightly different dimensions we'll see if it screws anything up.
    Going to chuck some fuel in and measure fuel level height.

    Just a quick question, which of these inlets is for the fuel? Quick look at pics online says the angled one bit what is the brass one for? Overflow? Route it to ground? Been a few months since I took it all apart haha

    IMG_20201231_143605.jpg
     
  14. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    The vertical one is fuel in... the brass one is overflow, it goes down towards the ground as you suggested.
     
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  15. edwardo

    edwardo Well-Known Member Contributing Member

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    Did some float height testing to try and get it to spec. Took a few trials but got close in the end.

    Also considering putting in an inline filter. I've seen a few setups: 2 filters one per line coming from tank and also one filter after fuel tap.

    The two before the fuel tap would protect stuff getting into the tap but it would cost more and have more connections. Also looks weird to me lol
     

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  16. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Definitely go with one between the fuel tap and the carby... what are the ones like on the outlet from the tank?
    Or are you not game to unbolt it lol
    Make sure there is no restriction in size on the filter... you want a good flow of fuel to the carby.
     
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  17. edwardo

    edwardo Well-Known Member Contributing Member

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    Mine didn't have any inline filters at all, just saw these from pics online. Will definitely put one after fuel tap


    Double checked float height in the manual, looks like I've set mine a tad high. Picture looks like the upper limit starts at the underside flat edge of the bowl, like same surface that the screw heads seat to. That would make mine a few mm high.
     

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  18. jmw76

    jmw76 Well-Known Member

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    I have not had a lot of luck with in-line filters on gravity feed systems. You need a filter with good flow designed for systems without a pump. Your regular cheapie filter from the auto parts store will clock in no time flat and starve for bike for fuel when ridden hard.
     
  19. edwardo

    edwardo Well-Known Member Contributing Member

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    Ended up buying some 8mm (I think) inline fuel filters from a motorcycle shop so hopefully they can flow the required amount.

    On another note, is installing the carb back on a bike the worst pita or what?! It's like my airbox rubbers are like 5mm too short and barely slip on the carbs.

    Thought I had the carb pushed in too far on the engine side but it seems to seat nicely where it's at. Weird. Frustrating too.
     

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  20. jmw76

    jmw76 Well-Known Member

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    Yep they can be a pain to fit with old intake manifold rubbers. Just make sure the intake side is nice and snug.
    It is even worse on a V twin, such as my VT250. If the rubbers are old it is a very frustrating process. Even with new rubbers it is not ideal.
     

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