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i need to get my seca 750 on the road

Discussion in 'XJ Technical Chat' started by theWoolf, Feb 22, 2011.

  1. theWoolf

    theWoolf Member

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    i just got it i made a blog on this topic already i need help. my 81 yamaha seca 750 will not start i cleaned the carbs and about to go check on it again i would love some input i put a new computer on it but its not the exact same kind it will start and run on starter fluid so i guess it is alright with that computer. i would like any hel i can get so plz help me
     
    theWoolf, Feb 22, 2011
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  2. waldo

    waldo Member

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    sounds like your not getting fuel or fuel is bad did you check float level wet after cleaning carbs, floats installed upside down?
     
    waldo, Feb 22, 2011
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  3. Bobe7316

    Bobe7316 Member

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    Do a forum search. At the top of this page you will see a small picture of a square box with a magnifying glass in it with the word search. Click on this
    and the forum search will open. In the search query in the top box type in
    not starting. You dont have to touch anything else scroll down to the button
    marked search and click on this. All the topics that come up will have info
    relating to not starting. You may find something to help in there. You can
    type anything that you want into the forum search and end up with a lot
    of help full stuff on a lot of topics.
     
    Bobe7316, Feb 22, 2011
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  4. theWoolf

    theWoolf Member

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    thanks guys i will look into all that!
     
    theWoolf, Feb 22, 2011
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  5. i_am_the_koi

    i_am_the_koi Member

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    +1 search... I've learned more from this forum and it's search then anywhere else... a wealth of information!!!!

    Thanks to all!!!
     
    i_am_the_koi, Feb 23, 2011
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  6. ManBot13

    ManBot13 Well-Known Member

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    Why the new computer (I assume you mean TCI module)? It would run with a different ignition module, but the spark advance curve is different between models so we'd need to know the part number on your TCI. It might not run "well"

    To make an engine run, you need fuel (air and fuel mixed at the proper ratio), compression, and spark, all at the right time. Check for each.

    I'd say start with compression, but know that out of spec valves can throw off your compression, as well as other more serious engine problems.

    Check for spark, make sure to ground the plug on the engine head.

    Fuel can be any number of things, from air leakage, to clogged passages, to clogged jets, and the bike will never start easily without the enrichment circuit cleaned.

    Search the site for these topics, report back on each of these findings, and post if you have any questions.
     
    ManBot13, Feb 23, 2011
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  7. theWoolf

    theWoolf Member

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    ok well i have compression and i have spark and new computer is because it was smashed and watter damadge. i got one that does have a diffrent number on it but came off same size motor and same year as mine. i dont know the code off hand i am at school.. but with starter fluid wich i know not to use to much for it is not good for the motor it would run for a few seconds so i know its a fual problem but i cleand the jets and everything but is the biger jet go on the taller tower or does the smaller hole jet go there?
     
    theWoolf, Feb 23, 2011
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  8. theWoolf

    theWoolf Member

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    also i do remember the numbers were close only a couple diffrents. also i tried to drain the oil and check it how do you check it on these bikes and what plug should i pull to change it?? what weight is best for this bike also???
     
    theWoolf, Feb 23, 2011
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  9. PainterD

    PainterD Active Member

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    That "computer" thing on the front of the bike (with the speedo and tach in it) is only for checking servicable parts on the bike and does not have any control over the way it runs or operates, it's just an electrical checklist when you turn the key on. It's a joke if you ask me (but you didn't)
    If your referring to the CDI box, you will not get the same performance if it is not the correct one for you bike. The Maxim and Seca ignition boxes do not work the same. You should get the correct one for the bike to run the way it was designed to.
    So you use starting fluid to see if it will run? Good, now don't use it anymore. You know it runs, so your problem is with the carbs now. Bench synch them will get you very close or atlest good enough to run. Then go on from there.
     
    PainterD, Feb 23, 2011
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  10. theWoolf

    theWoolf Member

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    well i mean ignition module when i said computer and its off idk i got it for free its off a 750 yamaha neer my year so idk it did run but mine had a red color tag on it and this one has a blue one but it did run so idk
     
    theWoolf, Feb 23, 2011
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  11. theWoolf

    theWoolf Member

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    i also hav no idea how to synch the carbs
     
    theWoolf, Feb 23, 2011
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  12. theWoolf

    theWoolf Member

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    well a update if anyone is interested i had the gf put the carbs back together with little supervision after i showd her how to do it with first one..... well i went back and fixed them the bike will startand runs (ok) with everystart and everytime i run it a little longer it does better and it is about to the point it idals all on its own(almost) idk if maybe the ignition modual will be ok or if anyone has one i can use or posibly buy idk or i can trade for theone i have? (would rather trade short on cash) sucks being 19 and in school lol. but if anyone has turn signals or anything to help me out i would be highly thankfull!!
     
    theWoolf, Feb 25, 2011
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  13. theWoolf

    theWoolf Member

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    i will also post pics of the bike when i picked it up and pics of it now all riped apart with my custome muffler on it. then the final when i put it all together with new paint and everything but that is only after it runs lol (great)
     
    theWoolf, Feb 25, 2011
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  14. Bobe7316

    Bobe7316 Member

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    I bought 3 spare TCI units off Ebay for my XJ650 and they may have a couple for your bike listed. I tested them all and they work ok. I keep
    one in the tool box just in case one decided to crap its self when I am
    200 miles from home. I put my brothers XJ750 TCI unit on my XJ650
    just to see what would happen. It started ok but did not run good as
    the advance curve was wrong. For the units I payed 95 dollars for the
    first one 70 dollars for the second one and 25 dollars for the third one
    that also had the voltage regulator still there as well. It just depends
    on who has them for sale and how rare they think that they are getting
    to find. You really need to get the right one for the bike.
     
    Bobe7316, Feb 25, 2011
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  15. theWoolf

    theWoolf Member

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    alrighty i will look for it and see if i can come across one in my prize range thank you
     
    theWoolf, Feb 25, 2011
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  16. PainterD

    PainterD Active Member

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    I too have swapped the TCI unit from a 750 Maxim with the one on my 750 Seca just for the hell of it. It started just fine, but did seem to be sluggish when going thru the gears. The advance curve is different for sure. I guess it would get me homein a pinch, but it's not too likely that it will fail. The TCI is not one of the XJ weak points.
     
    PainterD, Feb 26, 2011
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  17. theWoolf

    theWoolf Member

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    darn that sucks to hear lol well i looked on ebay one was a houndred and another was 2 houndred so if anyone is willing to sell me one i would b vary gratfull!! i just got the rest of my parts to finish the bike so this will b the vary last one. i tried getting a aftermarket one or a new from yamaha and they dont sell them. so if anyone can sell me one or show me another that is cheep on a reliable site would be amazing.
     
    theWoolf, Feb 26, 2011
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