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FZR250 - had work done to my bike and . . .

Discussion in 'Yamaha 250cc In-Line 4's' started by richie, Jul 9, 2015.

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  1. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    As Linkin pointed out, it appears someone has fitted a 520 kit. Therefore the drive sprocket has to have less teeth or its diameter would be too large to fit. Then to maintain a close to standard ratio the rear sprocket also needs less teeth.
    43/13 is 3.30:1 (520 kit)
    56/17 is 3.29:1 (standard)
    So they are quite close.
    If you take a look at the countershaft (drive shaft) and compare to these pics you will know if it has a later model shaft.
    http://www.litetek.co/Sprocket_Drive_Yamaha_FZR250_3LN3.html
    cheers
    Blair
     
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    maelstrom, Jul 12, 2015
    #41
  2. richie

    richie Active Member

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    Yea I checked there and it was blank I cleand off the crud to find nothing I wasnt impressed as it was raining ha ha, my chain has eatin into the rubber stoppers should I replace them they seem ruined
     
    richie, Jul 12, 2015
    #42
  3. richie

    richie Active Member

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    Hi blair ive looked at those pictures but I havent had my sprocket off as im waiting for the new set before I do (break) anything lol the only difference I can see is the oil filter is in my sump not like in pic 2 where I can see a can type filter.
     
    richie, Jul 12, 2015
    #43
  4. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    *Kawasaki ZXR250C *Yamaha FZR250R 3LN1 *Yamaha FZR400 *Triumph Bonneville 750 T140V *Triumph Daytona 675 *Triumph Tiger 800XC
    Ahh ... yes of course .... filter is internal on the 3LN1 only! .... your new sprocket should be ok then

    The chain guide?

    Chain guide.jpg
     
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    GreyImport, Jul 12, 2015
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  5. richie

    richie Active Member

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    Still doesnt explain why my motor has no feckin numbers on it bar 1hx lol am well it might be its rubbery or plastic I thought it was just stopping the chain from hitting the swing arm im a bit green still when it comes to motorbike parts!
     
    richie, Jul 12, 2015
    #45
  6. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    There's a couple of locations that the engine number can be, but based on the frame number, you have a 3LN1. Does it have the dual round headlights? Blocky rear brake light?

    Anyway, potential engine number locations:

    On the left of the clutch cover, underneath fuel tank

    [​IMG]

    Hiding behind the exhaust headers in front of the stator

    [​IMG]

    As you've stated it has an internal oil filter, it's definitely a 3LN1 engine. So your front sprocket will fit fine.
     
    Linkin, Jul 12, 2015
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  7. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Blank engine numbers are what new engine cases come with. As in "Oh my rods just poked a big hole in my cases. I better pop down to my local Yamaha dealer and order some new ones".
     
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    maelstrom, Jul 12, 2015
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  8. richie

    richie Active Member

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    I checked under the fuel tank linkin and it said 1hx only I cleaned it off to make sure and did the same with the front by exhaust near stator completely blank! I think blair might be onto something tho. It has roundy headlights and that iv put pics up in the members garage thing she looks sweet as :)
     
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    richie, Jul 12, 2015
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  9. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Looks nice mate!
     
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    Mclaren, Jul 13, 2015
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  10. richie

    richie Active Member

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    Thanks man
     
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    richie, Jul 13, 2015
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  11. Willrcr15

    Willrcr15 Well-Known Member

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    Looks like the sun's out ?
    The bike looks great, straight & maybe never dropped.
     
    Willrcr15, Jul 13, 2015
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  12. richie

    richie Active Member

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    It was then its been pissin outta the heavens last few days :-( the man who did my for seals said my front axel slightly bent and for the life of me I cant see it? Maybe I need to go to spec savers lol I don't think shes ever been on her side but there all new fairings on it. She used look like this with a real 20/20 paint job looks great from 20 yards and at 20 mph!.

    IMG_99569873949735.jpeg
     
    richie, Jul 13, 2015
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  13. richie

    richie Active Member

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    Oh ya I forgot ive been a bit bold today even with my knackered chain I went riding not too far but I did go a bit flat out and I noticed is she flat spots for about 1sec and gets going again. Lets say 2nd to red line change 3rd clutch out full nd full throttle again takes a sec and goes its like lag but it can redline. It really annoys me also the bike back fires abit on wind down when you come off full throttle at high revs with out a gear change if ye get me. Blahhh maybe mix screws? Diaphragm/slide related? worth pulling the plugs?
     
    richie, Jul 13, 2015
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  14. Willrcr15

    Willrcr15 Well-Known Member

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    It's wet here too, just drizzle & light rain but it's bloody cold, I reckon about 9 degrees outside, that's real cold for us, should be 18 but there's a cold mass moving north & another following slowly.
    Those poor buggers in Tamworth will be covered in snow by now ! They'll have a tale to tell after yesterday's ride ?
    Your probably swealtering in 30 deg heat ?
     
    Willrcr15, Jul 13, 2015
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  15. Willrcr15

    Willrcr15 Well-Known Member

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    Thats rich, probably need to drop the needles to mid, mix screws are only for 'at idle' see where the needles are set at.
    Backfiring is raw fuel exploding in the exhaust pipe, an over supply of fuel. Check the jets too & make sure they're stock or not too big if someones been into them. Your foam filter will be letting in more air than normal so it should be a bit on the lean side if anything, so it's likely something is way too rich.
    I used to thrill my son in an old petrol truck by turning off the ignition & then pump the pedal a couple of times on a down hill run & then turn her back on & listen for the backfire, worked a beauty till I blew the side out of the muffler one day & it cost me $150 to fix it.
     
    Willrcr15, Jul 13, 2015
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  16. Willrcr15

    Willrcr15 Well-Known Member

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    Could also be a weak spark, not getting all the burn.
    Take your plug caps off & nick 10mm of lead off the ends & screw the caps back on to eliminate a crook connection, check your plugs for gap & maybe replace them if they're of unknown age
     
    Willrcr15, Jul 13, 2015
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  17. richie

    richie Active Member

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    30 degree heat this guy ha ha its about 12 maybe 13 degress out thats warm here irish summer where only the rain gets warmer!! Id say so far its been about 24ish degrees here at best.

    I used have an old carby k10 micra and use to spit flames out the exhaust when you did that and an old suzuki alto that used sound like shot out off a shotgun when ya backfired it I did it in the square behind a jeep once and he stopped and got out checking all his tyres I nearly wet myself behind him as I did it twice to the poor man!

    Ive never done that before I wont damage the lead if I go at the cap is this at the plug side or the coil side? Or both?
    The plugs are a second brand new set guy who had my bike replaced my old ones with only 100 miles on them because they were fouled a bit and plugs are dear for this bike :-/
     
    richie, Jul 13, 2015
    #57
  18. richie

    richie Active Member

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    Oh yea and jets are main 100. Main 37.5 and slow 30 on inner carbs and main 102.5, main 37.5. Slow 30 on outters so it says on my carb kit boxes
     
    richie, Jul 13, 2015
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  19. Willrcr15

    Willrcr15 Well-Known Member

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    Did you use the 'Keyster' kits ? They are very good, fixes everything.
     
    Willrcr15, Jul 13, 2015
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  20. richie

    richie Active Member

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    Fixes everything?? Ha ha yep keyster was all I could get at the time im lucky I didnt get stung for excise importing them!
     
    richie, Jul 13, 2015
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