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Baja 5b need help!

Discussion in 'Large Scale RC' started by Northernnightmare, Dec 24, 2017.

  1. Northernnightmare

    Northernnightmare Active Member

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    Hi guys we (family) where planning a christmas rc bash fest with all sorts of nitro rc's in the snow we been getting. So last minute kinda deal i decided to buy a 5b buggy used but in mint shape.

    The problem, I cant seem to get it started no matter what!!! it has a good spark, and decent compression, and maybe even fuel at most times.

    The fuel is circulating threw the lines and bulb. And some times the plug is wet some times bone dry. The carb is a no choke modle further adding to the confussion

    I did get it to fire once, having someone (my old man) holding the transmitter to full throttle and it fired and ran for a bit but once let off is stalled and never ran again????

    I already tryed the following:
    - New fuel
    - 3 new plugs,
    -cleaned tank and new lines
    -cleaned air filter
    - made sure all the intake gaskets are allined
    - tryed using starter either spary still wont start, well not with the either
    - tryed tipping it up and hitting the gas a few times, someone online mentioned this for the no 813 choke carbs?


    Just last night i cleaned an partaily rebuilt the carb again, In the top of the carb under the bulb/diaphram is the stainless low jet feed, is it ment to be blocked off with a brownish plastic jell? I used a pick to get it out but now am reading its suppost to be like that? Either way it still wont start!

    Damb i really feel discuraged, I'm usaually the person people ask to help on this kind of thing, all my chain saws start right up, as well as 2 stroke dirtbikes.

    I really wanted to use it tonight and show off a bit, Any help or tips is much needed and aprecated,

    I might still get this thing going with the right help!
     
    #1 Northernnightmare, Dec 24, 2017
    Last edited: Dec 24, 2017
  2. desertbasher

    desertbasher Member

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    Carb clean? I doubt it... Needles at factory? Are you choking properly? I had my lever in the wrong position before, swearing it was right....
     
  3. Northernnightmare

    Northernnightmare Active Member

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    The carb was cleaned twice, once fully taken apart and put in boiling water, then used a air jet to spray out.

    Needles are at 1.25 turns out on both also tryed 1.5 turns out on the main?

    This random carb has no choke at all. was told 813 unit

    The strange thing is its got good comp and spark, plug only gets wet at wide open. and wont start even with starter fluid either spay?

    I gave up on the 5b for now and just ran the nitro savage at -8 deg's, it started right up with a heat gun trick.

    Might just order a new 1/5 engine when i get the funds
     
    #3 Northernnightmare, Dec 28, 2017
    Last edited: Dec 28, 2017
  4. desertbasher

    desertbasher Member

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    shoot just get a carb with a choke. No choke, better be tuned well. Carb is what, 40.00? Engine is expensive.
     
  5. ELWOOD

    ELWOOD Well-Known Member

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    Have you tried starting and testing without air cleaner in place in safe place, (garage), I over oiled my K&N once and had same issue. Also http://www.davesmotors.com has carbs and choke plates. Also have had good luck adding to carb to keep dirt out of area under primer bulb-
    Team Chase Carb Diaphragm Filter - av493
     
    • Like Like x 1
  6. Northernnightmare

    Northernnightmare Active Member

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    Yup I did that as well, and everything under the sun.

    I will cut this short and say i already ordered a 36cc as the stock fuelie 26cc is shot, I should have done a real compression test before I dove too deep into this unit. But oh well at least it looks like its in mint shape bahaha
     
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  7. badboy2

    badboy2 Active Member

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    Show us pix! And how sure are u that the engine is done? To go cheaper just buy the headkits from oneillbrothers or ddm ..theyre upgraded just transfer the pullstart ,flywheel and other parts..i personally prefer the carb with choke..
     
  8. Northernnightmare

    Northernnightmare Active Member

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    Just pulled it today the piston ring was stuck right at the set pin, its almost like it scraped a small peice of alloy off the port and fouled the ring to stick it inward to the piston. (I'm gessing thats why it never started?)

    The cylinder looks good other than the one 1.5mm wide mark below the intake port and maybe a ,5mm but taller scratch above the intake port. I'm gessing the piston is in the correct way with the arrow to the exhaust side?

    Might just put the ring back on and see if its got compression to star now, just for a laugh i still feel there not getting enough fuel but don't wana waist anymore money on this engine till the new one shows up.
     
    #8 Northernnightmare, Jan 5, 2018
    Last edited: Jan 5, 2018
  9. Northernnightmare

    Northernnightmare Active Member

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    Also had to start both my chain saws a and a weed eater to prove to myself I'm not going crazy and clear my mind of negative energy, not kidding wish i was but at least i know they run great now.

    Also ordered a tuned pipe and a spare carb today for the new Unit.
     
  10. JVT73

    JVT73 Well-Known Member

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    Ring stuck/welded to piston? Bad mix on fuel/oil or no oil at all! Noob's can trash a engine in 15min!
     
  11. parks450

    parks450 Well-Known Member
    HPISF Supporter

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    Set your needles to factory, turn the idle screw up as well.
     
  12. Northernnightmare

    Northernnightmare Active Member

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    5b is long gone
     

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