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tmc55

2000 yz 426f

20 posts in this topic

ihave a yz 426f and i was trying to get it to start and i it wont kick over at all the bike was sitting in my garage for about to months i rode it all summer with no problems at all can anyone tell me what could be wrong do you think it could be the carb any info could be very helpfull thanks

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if you're getting good spark and compression then try a little carb cleaner or starting fluid in carb. if all else fails you can try getting pulled around by a car and bump start

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I have seen that problem caused by having the fuel leaking into the cylinder & you get a hydraulic lock. Pull the plug & see if it will kick through then. Also after a period of non use my YZ400F I couldn't pull the decompression lever in & it just had too much compression. Finally gave the lever a hard squeeze & it broke loose & all worked well after that.

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i have all kind of compression and i took off the fuel line to see if it was getting gas and it is getting gas it just wont start it ran all summer long

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I would say clean your carb and airfilter. and stay away from starting fluid! its not to good on the motor. Check out the Pilot jet, as it sounds like it could be pluged up. When I got my YZ426 it had sat for a few months as well and it was really ruff to start untell I got my carb cleaned. Another thing to try if you think its fluded is to turn the gas off and pull out the hot start and hold it open and kick it over a bunch of times and see what happens.

Nick

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Not sure about the problem...Not starting or will not turn over? Going on the "i have all kind of compression" I will assume you can't start it.

Drain the bowl, clean the plug and while you have the plug out kick it a few times to blow out the chamber(fuel off, while bowl is empty). While your opened up put the plug in the plug wire and check for spark. Put clean plug in, turn your fuel back on and try starting it.

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the recommended plug is an NGK CR8E, I'm running a new one and very happy, but could be a better plug available.

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I agree with CyclePro. Take off your carburettor and give it a thorough cleaning. Make sure you blow through all the jets and passageways. Make sure you do not over oil your filter.

Also completely change your fuel as it may have gone "off".

Check the spark but if it was running OK previously, other than a fouled plug, the ignition/spark should be OK.

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thanks for the all info guys is it hard to get the carb off i never did it before.

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thanks for the all info guys is it hard to get the carb off i never did it before.

its not too hard. do you have a manual? assuming its the same procedure as my 400, just loosen the boots that go from the air box to the carb, and the carb to the head. the hard part is the cover for the throttle cables, the allen head bolts are a real PITA to get to, pop the cover off and loosen the nuts on the throttle cables, disconnect the gas and the TPS plug and wiggle the carb out.

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Luckily - on your bike - the carb is still easy to get off.

I remove the gastank and rad shrouds to make it easier

On the right side, remove the cable cover and remove the cables from the carb. (some people mark which one is upper/lower)

From the left - remove the fuel line and loosen the screws on the boots - I generally push the carb back to the air filter, this will remove it from the intake boot, then I swing it out at the front and pull it out of the airfilter boot.

Don't know if your bike has a remote hotstart - that may still need to be disconnected.

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Sounds like you are not using a fuel filter. My 426 will sit in the garage all winter, sometimes for up to 4 months. Usually starts within 3-4 kicks. No carb cleaning, no starter fluid, heck I don't even use Stabil, it's usually sits there with a 1/4 gallon or so in it....I just top it off and it starts. Make sure you turn off the gas petcock too when you put her to sleep.

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I'll reinforce the idea of cleaning the carburetor well. Clean all the jets and passages thoroughly and use a fresh plug as a precaution.

Bill

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where can i get a fuel filter and were do you put it at on the bike

Any motorcycle shop woth a damn will have little in-line conical fuel filters. Usually on a display board right at the counter. They cost about $2-3. Just cut your line about 1" after the petcock and install it. It'll take you about 30 seconds and save you hours of maintenance.

I don't know why YZ's don't come with a fuel filter. Dirt bikes are notorious for dirt in their fuel and clogging pilot jets. Mains are too big for most dust/dirt particles...

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I don't know why YZ's don't come with a fuel filter.

They have two of them. One on each of the two ports of the petcock leading from the tank to the fuel line, and another on the upper end of the needle seat.

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the recommended plug is an NGK CR8E, I'm running a new one and very happy, but could be a better plug available.

my bike started on the 4th or 5th kick, and was rough on choke... Installed one of these spark plugs and its like a new bike

perfect idle and starts right up :thumbsup::p

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The 426 has a little less ignition strength at cranking speeds than it probably should have, and so benefits from little improvements like fresh plugs more than a YZ450 does. Because of that, you might want to give the NGK CR8EIK iridium plug a try. Starting should improve slightly, but noticeably.

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