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Project Linkin's FZR250R 3LN3

Discussion in 'Your 250cc Projects' started by Linkin, Jan 31, 2015.

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  1. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Adrian has changed coolant, oil filter, oil... Our assesment from the sound of the bike - the muffler is sounding wrong, but there's also a loud tapping noise from the engine ( same as before in the cow on crack video ). @GreyImport can you have another listen and provide an opinion on what it may be?
     
    Grasshopper, Feb 17, 2015
    #81
  2. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Okay... Got the oil filter in the mail today, so I did an oil & coolant change

    [​IMG]

    Old oil was not runny, but it's a bit dark.

    [​IMG]

    Mounted choke assembly

    [​IMG]

    I retrieved only ~750ml's of coolant from the bike, most of that was from the overflow bottle. Very little came out of the radiator.

    I almost used all the coolant filling up the radiator, and also filled the overflow bottle half way. I did drain the radiator first, it didn't suck anything from the overflow bottle, which is worrying. Not a big issue now that the radiator is full.

    I also discovered my side stand switch is not bolted on, it's just sitting there held on by grime. It fell out of place during the oil change

    The engine is still making godawful noise... also doubt the exhaust will pass a blueslip so going to have the 3LN6 one (which has 3LN3 stamped on it) sent to me from the fizzer factory.

     
    Linkin, Feb 17, 2015
    #82
  3. kiffsta

    kiffsta Senior Member

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    Hey Linkin

    Adjust your idle and bring it down as that's very high, then get yourself a long screw driver, place the pointy end on the cam cover and put the handle end to your ear, listen to the engine sounds , then move it down to the bottom end and do the same, you should be able to work out where the sound is emanating from ( ie the knocking sound will be louder depending on where you probe) . For me , its sounds top end, but I cant be sure.

    What was the issue with the exhaust Grasshopper ? I thought it sounded okay

    Chris
     
    • Like Like x 3
    kiffsta, Feb 17, 2015
    #83
  4. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Myriad of sounds there ...none sounding that good

    Of course there could be something internally shot but first thing I would do is the CCT

    Are the header clamps all tight?

    Are the plugs leads ok and are the plugs themselves in properly and 'tight'?
    Is it actually running on 4 cylinders?

    Is the muffler on correctly and tight and no 'holes' in it?

    How much oil did u put in?
     
    • Like Like x 1
    GreyImport, Feb 17, 2015
    #84
  5. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Agree with Grey, sounds like exhaust headers are leaking badly. But very difficult to tell anything with the videos. It is not like being there.
     
    maelstrom, Feb 17, 2015
    #85
  6. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    I can attest to the screwdriver trick. Helped my diagnose alternator chain rattle compared to cam chain on the 7r. Check tension of the exhaust bolts. I do believe you have said there where loose bolts elsewhere could be it.
     
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    Th3_Huntsman, Feb 17, 2015
    #86
  7. Mclaren

    Mclaren Well-Known Member Contributing Member

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    I know that noise it cam chain mine did the same
     
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    Mclaren, Feb 17, 2015
    #87
  8. zixxer

    zixxer Well-Known Member

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    does sound like a top end noise, agree with GI to do cct, worst case its the chain itself, but if your doing the valve clearances may aswell do that too, could be shitty valve clearances also. Get exhaust gasket goo and put it around the headers.

    last time my cct went it sounded very similar to that.
     
    • Like Like x 1
    zixxer, Feb 17, 2015
    #88
  9. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Thanks for the input everyone. I have a pretty good to do list now.

    Header bolt torque
    Cam chain & tensioner
    Valve clearances
    Exhaust gasket

    I do not have an exhaust gasket. Has anyone got one or got the Yamaha part #?

    I have a cylinder base gasket and head gasket which will go one when the valve clearances are done
     
    Linkin, Feb 17, 2015
    #89
  10. zixxer

    zixxer Well-Known Member

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    head gasket is a big job mate, if your going that far definetly do the cam chain while the mechanic has it all apart.
     
    zixxer, Feb 17, 2015
    #90
  11. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    I'm going to have the bike mechanic do it all. If my deadline (VJMC) wasn't so close I'd at least attempt the engine work myself
     
    Linkin, Feb 17, 2015
    #91
  12. Murdo

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

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    I think cam chain is the problem, but hard to say from a video. Also sounds to be having an occasional miss on one cylinder, can hear it when camera near exhaust, so maybe new plugs/check leads.
     
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    Murdo, Feb 18, 2015
    #92
  13. Joker

    Joker See "about me" for contact details. Contributing Member

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    Yeh sounds rattly, I wonder what the valves are doing. Reckon it's missing too. Could be cam chain....
     
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    Joker, Feb 18, 2015
    #93
  14. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    I concur, I tightened up the headers. Lawnmower sound = dead. Bike is a lot quieter. Still rattly while idling. Rode it to get fuel, it's smooth. Handlebars need adjustment but the bike tracks straight. No odd vibrations or noises, and the rattle disappears above 6k rpm or so. Exhaust still sounds crappy. Probably right about missing on one cylinder.

    The mechanic should have an easy time. To do the valve clearances they need to take off the cams and chain/tensioner, I have the rocker gasket and the head gasket so no issues with that. Plug change should be simple for them.

    Idle is still high so I'll have them look at that.

    The best bit? It didn't flood, and there are no flat spots. Guess who doesn't need to mess with carbs? :dance2:
     
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    Linkin, Feb 18, 2015
    #94
  15. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Good carbs? Is that really possible??? On a Fizzer? :idk: Naaah, it's early days yet!!
     
    Grasshopper, Feb 18, 2015
    #95
  16. Joker

    Joker See "about me" for contact details. Contributing Member

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    Interested in your carby settings if you ever check them. I wonder if it's running leaner than std on the needles.
     
    Joker, Feb 18, 2015
    #96
  17. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Stu, the carbs I recently fitted on my Fizzer that are running pretty well, they are set to 2nd one from the top.
     
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    Grasshopper, Feb 18, 2015
    #97
  18. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    @Linkin Great news!
    Probably a good idea to get a set of new exhaust gaskets as those ones will be toast.
    Oops! You are already onto that.
    I also agree that you should not change the head gasket unless you need to.
     
    maelstrom, Feb 18, 2015
    #98
  19. zixxer

    zixxer Well-Known Member

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    honestly if he is wanting to keep the bike for a long time and is doing cam chain, clearances etc all at once the head gasket shouldn't be too much more work.
     
    zixxer, Feb 18, 2015
    #99
  20. Murdo

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

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    Why do you want to change the head gasket?
     
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    Murdo, Feb 18, 2015
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