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Cold start woes

Discussion in 'XJ Technical Chat' started by maz43, Jun 25, 2008.

  1. maz43

    maz43 Member

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    My '82 XJ750 is having some trouble starting when cold and runs like crap until it gets good and warm. Very little maintenance was done by the PO except oil changes.
    I put in NGK BP7ES plugs in (had RN9Y) and it neede a little choke when starting.
    I put in a new air filter as the old one looked like it never had been changed and now it is tough to start and idle until warm.
    Full choke stalls it right out. reading the old plugs led me to the clogged air filter.
    The bike runs excellent and very strong when warm now-much better than before.
    Can some lead me in the right direction? Im guessing that something in the carbs are a bit on the dirty side.
     
    maz43, Jun 25, 2008
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  2. ZaGhost

    ZaGhost Member

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    Sounds like a dirty pilot and or clogged enrichment circuit
     
    ZaGhost, Jun 25, 2008
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  3. maz43

    maz43 Member

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    That would mean tearing apart the carbs and cleaning them I presume?
    Would some carb cleaner sprayed into the intakes (with the air filter removed) do any good?
    The last time I took a carb apart my boat motor never ran again. Of course I didn't have a Haynes manual and a forum like this to get help from.
    I doubt the drain screws have ever been out before- I'm not looking forward to seeing what's swimming around inside.
     
    maz43, Jun 25, 2008
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  4. ZaGhost

    ZaGhost Member

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    Yep, fraid so....
    Not as bad as it sounds, Rick has an amazing guide on here for getting carbs cleaned up and running right. Helped me out tons, along with a copy of my manual...

    You could try seafoam first, but nothing is a good substitute for a manual cleaning.
     
    ZaGhost, Jun 25, 2008
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  5. CdnDave77

    CdnDave77 Member

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    Rick's Old School How-To is what you need. It's a great walk-through, and your bike will thank you for it. Look in the FAQ Suggestion forum, print it off, put some beer in the fridge, and go at it.

    Take your time and be extra diligent.. but it's well worth it.
     
    CdnDave77, Jun 25, 2008
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  6. Ass.Fault

    Ass.Fault Active Member

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    Ass.Fault, Jun 25, 2008
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  7. maz43

    maz43 Member

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    Looks like I have a weekend project ahead!
    I'll give the seafoam a try but after reading through Ricks tutorial, I think I can get back on that horse and ride it(carb work, that is).
    I work as a prototype machinist so getting micro diameter taper length drills and other goodies won't be a problem.
    I hope this job goes better than the boat motor I destroyed. 8O
    Now to get up the courage to dive in.........
     
    maz43, Jun 25, 2008
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  8. brtsvg

    brtsvg Member

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    When your carb cold start enrichment circuits are factory clean your bike should start easily at temps 40F and above without the choke on. Pay carefule attention to amking sure that the jets are absolutely clean - when the carb cleaner squirts out 5-10 ft through these jets you are sufficiently unblocked to be considered done.
     
    brtsvg, Jun 25, 2008
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  9. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    Be carefull with seafoam it can attack your carb diaphrams. It works great on the metal parts of the carbs and it seems to make the carb diaphrams gooey like the rubber is melting. It also did the same thing to my intake boots. (softened them right up so it was easier to work them on and off) I was able to clean mine off before it did any harm.

    Check the mixture screws. once you get the carbs off I found that mine the little holes that the needle tips go into were clogged with something. I took a tourch tip cleaner and ran it through and it runs very nice now. (My Black 750 Maxim) There are springs and o-rings under those adjustment screws so work on a clean work surface so you don't loose them. Good Luck
     
    MN-Maxims, Jun 25, 2008
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