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Project The (Mexican) Fizzer Mk III

Discussion in 'Your 250cc Projects' started by Joker, Dec 7, 2017 at 9:10 PM.

  1. Joker

    Joker CLUB250 Staff Member Premium Member Ride and Events Crew Contributing Member

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    Couldn't help myself, was an absolute bargain. Runs terribly but runs so it's already worth it. It has a 3LN1 engine in it but is a 3LN3. I wonder what the carbies are, another 3LN5 set and I'd be cheering.

    More to come.

    24946028_10159700578825716_1100204032_o.jpg
     
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  2. Joker

    Joker CLUB250 Staff Member Premium Member Ride and Events Crew Contributing Member

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    Now I have a bit more time, the background on this is that I actually know this bike. It was a club members and was put in reasonably good condition before it was on sold to some naive guy who had little idea on what to do when the weather changes and fizzers become temperamental. So he took it to a mechanic, (surprisingly a good one) - who told him the "Carburetors were held together with silicone and need replacement". Isn't that just the biggest cop out ever? They apparently put it back together and it's never run well since... what a farce. Oh well, his loss is my gain - when you can count the number of yellow bills on one hand that are parted with it truly becomes a "kiffsta" special. The mexican fizzer factory now has 3 complete and running fizzers in it - GreyImport Linkin I'm sure you'll agree that's a miracle in itself!

    :lolsign:

    The bike sounds noisy and ticky plus it seems overfilled with oil and doesn't idle so once I drop the oil and reset the carbies (as well as replacing an indicator) I'm expecting it to run reasonably well again. It even has 2 months rego for test riding! Might need to do some valve clearances as well, but been there before - that's more of a time/availability on my part thing. Updates as we go... rainy weekend ahead and now I don't need to spend all my time on the 400 I may as well resurrect this beauty.
     
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  3. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Good score mate , sucks that it is at someone else’s expense but that is part of the game.

    Look at the cbr1100xx blackbird I bought this week, guy had the shits because the clutch failed and sold it to me cheaply he didn’t check the clutch res which was empty.

    I don’t feel guilty anymore , they offered it for sale and put a price on it.


    So what’s the plans with the fizzer, track bike maybe ? ​
     
  4. Joker

    Joker CLUB250 Staff Member Premium Member Ride and Events Crew Contributing Member

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    You've definitely got a knack for the bargains Chris haha.

    I don't know yet. Depends a bit on what I find. Probably a "fix and flip" as I have the 400 as my toy and the other fizzer needs to go as well. Any money I make will be sunk into the 400 and my 650 in accessories (after I throw a few bills the wife's way to keep her at arm's length of course - if I'm going to have fun I actually have to still be alive!)

    I'm not much of a track person, more a time and circumstances thing because I'm definitely interested. I'd prefer to use the 400 on the track if I was going to do it anyway, got a bit more kick and honestly the 250 is a bit underwhelming in comparison for a gorilla like me.
     
  5. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club

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    Good score. Personally since you know the carbs are already in need of work, I'd do the clearances and check the timing chain while you're in there.

    Every fizzer we've had, including the pink lady, plus my zeal had valves tight beyond spec and/or a stuffed timing chain.
     
  6. Joker

    Joker CLUB250 Staff Member Premium Member Ride and Events Crew Contributing Member

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    20171208_173117.png


    A few of the club guys came around to give me a hand going over the bike. Unfortunately as the evening went on, things got progressively worse. What went from a strong tick when to this, and I knew for sure one of the valves had dropped. Whether it had dropped prior to me getting it or not I don't know, I did suspect some potential top end issues but didn't think it was quite this serious. I had done no engine work until this point so it's a shame but luckily I have a shed full of spares - and I'm glad this bike was only a couple hundred bucks...



    Here were the results of the engine teardown:

    1. Put oil in your bloody engine you idiot. There was only 500mls in there when there should have been 2-2.2L.

    20171208_173635.png

    2. External oil filter, so i't s a 3LN3 engine.

    20171208_173148.png

    3. This piston is so blessed, it's holy!

    20171208_203918.png

    4. The cylinder head has seen better days... see the bit of valve bashed off heh.

    20171208_211810.png

    20171208_204023.png

    Lots of metal in the sump where we retrieved the broken valve piece and cleaned it out of all the shaved bits. We checked the bottom end while we were there and it looks good still so luckily we only need to worry about the top end.

    20171208_211739.png

    5. The bore only had a little nick at the top left there, so we decided to take the risk and re-use it after sanding it back a bit with wet and dry. The stopping position of the rings seems to be just below the nick.

    20171208_223422.png

    6. Carburetor diaphragm problems. Some idiot tried to use sikaflex to try and repair. Had a couple spares so changed those in.

    20171208_182611.png 20171208_195419.png

    7. Both these piston lugs (that hold the piston onto the conrod) come from 3LN3 engines. Interesting how one is longer than the other, I had not noticed this before.

    20171208_223154 (1).png

    So at the end of the evening we had transferred the rings to another spare piston (given the bike still seemed to have good compression), installed that piston and put the bore back on. I need to rebuild my spare cylinder head now, I have one that will do the job I just have to put all the valves back in and shim it. Only thing I'll need is to order a new head gasket.

    It's going to take a bit longer than I had hoped but considering the situation it wasn't too bad. 3 hours work last night to get the engine back to requiring the cylinder head, if I had one and a head gasket ready we probably would have had it started and test riding.
     
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