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Project The Second Fizzer

Discussion in 'Your 250cc Projects' started by Joker, Sep 28, 2016.

  1. Joker

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

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    Engine's back together, timed up and re shimmed. Had a club mate come round and help me put it in so that's done too.

    Did some temp connections and went to start it up and... whoops left the carby drain screws out! So I was swimming in fuel once I put on the tank and turned the key...

    LOL guess it was a bit late in the evening for my brain. Called it a night at that point. Might try again tomorrow!
     
  2. Joker

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

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    "I'll be out in the shed tomorrow night" he tells the missus.

    30 minutes later...



    Vroom Vroom.

    No real issues starting up, bit of a "jimmy rig" setup as you can see but the motor sounds strong. Now for the general tidy up to prepare her for a run, nostalgia is killing me.

    Ups to @kiffsta for the engine, has come together well.
     
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  3. Joker

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

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    @Linkin do you still do oil filters? Could use a couple for the 3LN1 engine :)
     
  4. Joker

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

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    Right so I spent a good portion of the day tidying up everything and putting her together. Everything went well, I lost a connector by accident so had to do some soldering and rewiring on the connector that has the oil light and the neutral switch. The other issue I had was the startermotor shorted itself out for some unknown reason, it wouldn't start but the starter coil would just click and nothing else happened. Once I figured it out it was a simple changeout and then it fired right up.

    Since that time I've noticed the oil light doesn't turn off once the bike is running. This makes me nervous, any ideas on how to best troubleshoot this? I thought about pulling the whole oil switch out and replacing it with one of my spares, but it could be because something isn't pumping properly...? Don't know.

    The bike turns on immediately with no choke so it seems to run OK. I've been using some manky second hand oil while I cut the rings in a bit before I do an oil and filter change (no point wasting two lots of good oil) but I have done that before and not had this issue. True I did not inspect the oil pump/sump area when I rebuilt the engine though, so if it was like that I am unsure. When I started the bike the first time I don't recall it being an issue... wiring is definitely correct though.
     
  5. risky

    risky Megelli King Premium Member Contributing Member

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    oil light not turning off is often a faulty switch or a clogged oil pick up strainer.i would not use 2nd hand oil in any motor for any reason.new oil and replacement switch would be first steps.
     
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  6. Joker

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

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    Thanks - maybe a cleanout and fresh oil will fix it, I can't see how the oil pressure sensor would be a problem but I have a spare that I know works.

    True that I did not check what was in the sump/base of the engine before I started it up though - probably should have in hindsight. I drained it and there wasn't much in there (maybe 300 ml) and what came out didn't seem too bad so I didn't bother digging into it.

    As for using second hand oil, I suppose you could use cheap new oil or what I did - same grade, just done 5,000 kms in a bike prior to me putting it in this bike. Can't see a major risk, provided it's not lumpy or like vegemite but that's just my opinion. If I'm cutting in rings I want a little wear in the bore area, plus dumping new oil would be expensive so there's my logic. Maybe not everyone's cuppa but each to their own I guess.
     
  7. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club

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    3LN1 has an oil level sensor and is known to get clogged up. @GreyImport had the same issue. Take it out and clean it.
     
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  8. Joker

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

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    Thanks, I took it out and had a look... couldn't visibly see anything wrong with it but cleaned it out anyway. Dumped all the oil too, will put some fresh stuff in once I get a replacement oil filter. For some reason the bike shop gave me a HF114, that's what their book said, saw it myself and I just trusted them as I didn't check the original filter first (hindsight is a funny thing). What came out of the bike was a HF145... just another pain in the bum.

    Bike is ready to go again once I get the new oil filter.. see what happens I suppose. I wonder, can you retrofit a 3LN3 sump to the base of this engine and use the other oil pressure sensor? Just put the wire on that instead, also allowing me to use an external oil filter? might do that if I keep having issues, will also pop the top of the engine to ensure oil is getting up there.

    22291118_10159427833380716_2175227605914413625_o.jpg
     
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  9. Andych

    Andych Well-Known Member Premium Member Contributing Member

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    Normal practice would be to turn the engine over on the starter with plugs out to ensure you have visually have oil up the top and that it builds up pressure... at least it is on any engine I have ever built... from single cylinder bike engines to 450hp Chev small blocks and plenty in between.
    Not doing it you run the gauntlet of oil starvation... I would always use new oil as well... it might seem expensive but it is far less $$ than crating a fresh rebuild because of contamination.
    But... each to their own way of doing things... :)
     
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  10. Joker

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

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    Well new oil and filter, the oil light stays on which Brian indicated is the same with his. Maybe it is meant to stay on...? Seems to be getting oil ok.

    Had an issue with the thermostat, up to temp was spewwing water out if the housing. Have to swap it out as I have a spare luckily. After that I'll run it again up to temp and can't see why I couldn't test ride.

    Club weekend ahead though so may have to wait another week.
     
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  11. Joker

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

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    Umm... theres a problem with the thermostat johnny... its freakin empty!

    What happened to the internal bit?

    20171015_192749.jpg

    Out comes a spare... that's better... spot the difference lol

    20171015_192752.jpg
     
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