04 crf250r wont start
  • Lime o
    Posts:5
    Joined:Fri Feb 21, 2020 3:37 pm
    04 crf250r wont start

    by Lime o » Fri Feb 21, 2020 4:59 pm

    Bikes got GD comp checked valves a little tight got shim kit valves adjustment GD bike was put on lift after riding One afternoon went in the shop 3 or 4 days later lift had bleed off bike had feel over no harm no foul not sure about that hasn't started since got ahead of myself the the valve adjustment was done after the bike feel over! Here's what I found and things I've done Had fire so rebuild carb then after removing side case found that the 10mm dowel wasn't there flywheel had rubbed stator so after install new dowel and stator and ignition coil now bike has great spark ignition coil primary peak voltage 100volts min got 115 Direct ignition coil checked GD exciter coil peak voltage 50 volts min got 45-48 CKP I have not checked but should check 0.7 volts over last few months of trying to start this bike it's back fired 3 or 4 different times like the timing off but hard timing has been checked more than once everything checks out ICM maybe ? Does the CKP tell the exciter coil when to fire? I hope someone can give me some input I'm at the end of my know how lost!
  • Leardriver
    Posts:462
    Joined:Wed May 05, 2010 10:33 am

    Re: 04 crf250r wont start

    by Leardriver » Sat Feb 22, 2020 9:21 am

    Punctuation, sentences, and paragraphs make it easier to follow.

    When you said that you rebuilt the carb, what does that mean? I always suspect a plugged pilot jet first, and although it is possible to clean one, it isn't worth it when a new one is so cheap.
  • Lime o
    Posts:5
    Joined:Fri Feb 21, 2020 3:37 pm

    Re: 04 crf250r wont start

    by Lime o » Sat Feb 22, 2020 9:32 am

    All jets been replaced needle valve n needle float valve float and float even float pin
  • Leardriver
    Posts:462
    Joined:Wed May 05, 2010 10:33 am

    Re: 04 crf250r wont start

    by Leardriver » Sat Feb 22, 2020 12:46 pm

    There is a process to go through when reassembling. It's hard to know what component isn't working.

    Blow in the fuel inlet hole before you put the bowl back on, and lift the float. did the valve stop the oncoming air? If so, assemble the bowl.

    With the fuel screw out, blow compressed air into that passage. You will feel it coming out into the carb bore. Reassemble with spring, washer, and oring. A dad of grease to keep that assembly together long enough to get it started is perfectly acceptable. Tighten down until it seats lightly, back out 1 3/4 turns. There is often a chunk of ethanol sludge at the top of the fuel screw passage. I like to gently scratch the top of that area with a metal dental pick, and blow it out again.

    Blow air into the pilot passage. Do you hear and feel air coming out of other areas of the carb? This is the number one cause of bikes not starting.

    Does the accelerator pump shoot a solid blast into the intake passage? There is an adjustment for that, but right now, we're just trying to get it to start.

    Will it start with the air filter removed and some starting fluid sprayed into the back of the carb with the seat removed? I don't like starting fluid as a crutch, but when we're trying to diagnose a no start condition, it is useful.

    I have had bikes that I towed behind a car, holding onto a rope, with the choke out, pull it up into second gear and popped the clutch. Not textbook, but we want to get it to start, and then figure out why it is hesitant.
  • Lime o
    Posts:5
    Joined:Fri Feb 21, 2020 3:37 pm

    Re: 04 crf250r wont start

    by Lime o » Sat Feb 22, 2020 9:00 pm

    The problem is not in the carb it's got fuel and it's got fire it's not getting fire at the rite time I've had carb off 6 or 7 times I've check the carb thru and thru a half dozen times

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