Question about 2005 Suzuki RM-Z 250

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Howdy, I have a problem with a stuck hot start plunger. Symptoms appear to be moisture has "gummed" it solid in the carb body ! any suggestions ?? MH

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  • mike374 Dec 28, 2008

    Greetings from Far North Queensland Australia,

    Yep I got that plunger outa there - but not easily.

    Yep needs a new one since the brass cable recess crumbled under modest persuasion.

    Have polished the plunger portal.

    Looks like I gotta remove and clean and lube that critter more often. Thanks for the advice - appreciated !!


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Remove plunger and replace with a new one moisture has ruined the other one clean out area well

Posted on Dec 28, 2008

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Leaking oil around drive sprocket

This is caused by the float in the carburetor becoming stuck in the down potion. This happens due to dirt build up or, a bad seat on the plunger that controls fuel into the carb or a leaky float. The float may have a leak that causes it to take on a amount of fuel. The carburetor needs to be cleaned and rebuilt. If you've never done this I suggest you take it to a shop and ask them to do it.

If you want to try and to it yourself buy a repair manual, carb rebuild kit and a can of carb cleaner. Use the manual to find out how to remove the carburetor and disassemble it. Take your time disassembling the carb. Find a clean place to work. Lay out each part as your remove it in order. Pay special attention to the small plunger that is attached to the float. Make sure you replace the float and plunger both. You'll get a new ones in the kit. Make sure the tube it fits in to is clean. Spaying cleaner directly into this is normally good enough to get it clean. Use a small brush or a q-tip wrapped tightly by twisting it in your fingers if you need to. DO NOT use anything that can scratch. This will ruin the carburetor. Clean carb body and all parts thoroughly with carb cleaner. Carefully reassemble, do not over tighten any screws.

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I have a 2003 honda shadow 750... problem is every time i start the bike it will only run with choke even when its warmed up and when i ride the pipes back fire like crazy... it just hasn't been...

THose symptoms are those of a bike with clogged / gummed up carbs. At this point you will need to remove the carbs, completely disassemble them, and soak the bodies in a quality carb cleaning solution, overnight.

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2005 YZ250F. Runs good with choke pulled out even after it is warm. as soon as I ush the choke in it backfires won't run. I used nto have the same symptom on an earlier model and it was always the hot...

first of all, after the bike starts release the choke, you dont want leave the choke on until it gets warm, because it makes it a really rich mix, and it will eat the oil off the cylinder wall and you can burn the rings and cylinder wall. try this. at the bottom of the carb is a fuel screw(small standard flat head screw) turn it all the way closed, then back it out 2 full turns, that should give you proper mix, right now your running way to lean, thats why its working with the choke in. has anything been done to the bike? new after market exaust? if so it could be a jetting issue. and you are correct about the hot start.....there is a little rubber gromet on the barrel of the hot start plunger where it goes into the carb, that washer could be bad, or the black plastic boot that attatches the hot start to the carb could be bad and is allowing air to be sucked in...but i would reset the fuel screw on it first....hope this help. if not, repost and we will get ya figured out. p.s. nice bike.

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Having problems starting honda ruckus i can get it runing buy spraying gas into the carb but then dies any ideas

This sounds like no fuel flow to your carb. I would proceed as follows:
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If you did have fuel flow, you will need to take the carb(s) apart and see what is wrong. Some times the float needle gets stuck and a moderate tap on the carb body with a screwdriver handle sometimes releases it, otherwise, you need to open the carb and look for gummed up orifaces and inlet valve issues.

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I just fully cleaned the carborators and replaced

Were the carbs leaking before you took them apart?
try this use a rugger mallet of the hadle of a hammer and rap on the carb body to jar the carbs some times after rebuilding the carbs the float has not reacted to the fuel level. or you missed something in replacing the needle seat. If the carbs where gummed up from old fuel the little plunger on the float needle may be stuck it should move freely check it if its stuck soak it in carb cleaner you may need to take small needle nose pliers and grab it and give it a little twist to fee it be careful don't chew it up then soak it work it a few times.
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1 Answer

Bike has sat up for a year or so,wont start,cranks fine,has spark,maybe bad fuel ?

If no fuel stabilizer was added while the bike sat for a year or so.
It is most likely bad fuel with gum deposits.
This can can create some problematic symptoms for you.

It is vital the bad fuel to be cleared from tank/lines and carbs.
You may need the fuel system cleaned as the gum deposits can cause major headaches in the carbs and jets. If the system is not cleaned and even after you get the bike running, you could be miles away and have the fuel fowl jets/injectors, causing shut down.

Check the spark plugs carefully. Oil on the plugs may just need cleaning. Once you get the bike running the oil should burn off if the rings are still in good shape.

Motor needs clean Air, Clean Gas and a hot spark.

Good luck!

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the old gas has returned to its natural state....TAR

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1 Answer

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1 Answer

Suspected problem with choke.

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