Question about 2005 Honda CRF 450 R

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Crf450r will not start after winter storage

Refilled all fluids,fuel valve opened,regular starting procedure.plug is dry after choking. will run fine when bump started.

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  • chuck hall Apr 28, 2013

    crf450r runs fine,just have to bump start.carb was drained completly for winter

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  • Contributor
  • 14 Answers

Carby may need pulling apart and cleaned internal

Posted on Dec 30, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 48 Answers

SOURCE: will only run with full choke and absolutely no throttle.

Carbs gummed up. Need a serious cleaning or a full ruubers replacement/rebuild kit. Gas turns to gummy when left stting in the fuel bowls.

Use a couple of cans of Sea Foam.. best stuff in the world.

Posted on Mar 20, 2009

  • 46 Answers

SOURCE: 2005 CRF450R Hard to start and wont idle

Hi
I would suggest that you have the valve clearances checked.

Also, check that the carb is clean. Pay particular attention to the PILOT JET as this opperates the idle circuit.

Jon

Posted on Mar 05, 2009

  • 3567 Answers

SOURCE: hi i have a cr125 on a 96 it starts with a bump

You may need a carb kit. Sputtering is usually one of two things. 1) bad seals in the carb, install a kit.

2) water in the fuel.
Clean the pitcock water trap, check the air cleaner, drain the carb

The generator stuff sounds pretty weird and off the wall.

Posted on Mar 14, 2009

  • 5 Answers

SOURCE: bike will not idle witout having choke on a bit

I have a supermagna and used fuel stablizer once and it wasnt fit it gummed my carbs up,ive cleaned mine often and it isnt rocket science,remove the tank airbox assembly,loosen up the boot flanges that hook the carbs to the motor(ones on carb)then remove the carbs,then the cables,choke and throttle,do not remove carbs from assembly(leave all 4 together)remove the bottoms and tops of a carb,removefloat and jet,then remove all the brass jets and clean them so you can see through holes,,blow out all the holes in carbs,and reasemble,works for me every time,about two hours to do,good luck

Posted on Apr 05, 2009

voodoomox
  • 1689 Answers

SOURCE: 2002 honda crf450r starting problem

Hi Smit,

here are some thread that will really be helpful for you and your bike.

http://www.thumpertalk.com/forum/archive/index.php/t-589583.html

http://www.supermotojunkie.com/showthread.php?p=862289

http://www.mototips.com/general-bike-repair/21014-crf450-04-hard-start-cuts-out.html

happy trails,

regards,

voodoo

Posted on Jul 22, 2009

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2 Answers

Westwood t1200 - sparks on pulling cord but engine doesn't start . Was serviced last summer and parked . Fuel +. New carb and plug Ideas please


For an internal combustion engine to run, it needs fuel, air, spark and compression. Since it ran last year it is safe to assume you have good compression. Also, you can assume it has air if it was professionally serviced last fall and was running ok when you put it away.. You have spark so that leaves fuel. The first thing to check is fuel supply. If there is a fuel shutoff valve on the fuel tank or the fuel line leading to the carburetor check to see if it is ON. If the tank has gas and the valve is open or non-existent, then remove the air cleaner and spray a quick shot of starting fluid into the carburetor with the choke open and try starting it again. If it fires but quits, it is a fuel delivery problem. Primary suspect is a plugged main jet in the carburetor from sitting over the winter with oxygenated fuel in it. That is the same type of fuel you put in your car. It oxidizes metals. The jet can get restricted from oxidation (like rust). If that is the case the carb needs to be cleaned professionally. Use non-oxidized fuel in the future and run the engine dry for storage. Keep no more thn a months worth of gas on hand. Hope that helps.

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1 Answer

I installed new carb. on my tecumseh 5hp. snow king and it wont start. I have spark and gas is flowing out of carb.


This can be very frustrating and tough on the back and arm.
Always confirm the the fuel tank valve is open and the stop/run switch is in run position

It takes three things to run:
  1. Compression. This is the resistance that you feel as you crank the engine. Some engines have compression release to assist getting the rotation started. You should be able to feel the compression stroke as you rotate, Remove the plug and you can easily tell the deference. If it had, last time used, been running and starting with no problem I would assume that the compression is OK. Gauges are available to check. at lease 120 PSI
  2. Spark. It is near impossible to lose the spark timing on these. It can only be magnitude and presence. If in doubt about the condition of spark plug replace. I usually lay the plug on top of the head with wire attached and observe for the spark. No spark no start.
  3. Confirm that the throttle is in the wide open position. It is possible during the repair the spring or rod has closed the throttle air valve. Air/fuel mixture is always hard to trouble shoot. I use open choke and starter fluid to conform that compression and spark are working. After that I will choke on a cold motor and pull listening for the first fire. At the first fire I would usually half choke and pull to first run. Full choke for many pulls will only flood engine!! If no joy then I would allow engine to vent and go back to start fluid. If it will run on start fluid than either carburetor is messed up or quality of fuel is bad.
If after several tries and fuel is certain to be good remove plug and check for gas. It is possible that the new carb float valve or mixture adjustment screws are messed up.

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1 Answer

Turns over but dose not start, spark plug sparking ok


Check you have petrol if the bike has not been run for sometime replace the fuel. Petrol ages and causes all manner of problems.
Are you trying to start the bike but it has gone onto reserve, move the fuel tap to the reserve position then try to start it. If the above fails, then try these:-
Is the spark plug wet when removed. If dry it sounds like the petrol is not getting through. Try opening the filler cap and leave it open, make sure the kill switch is in the run position. Try starting with the throttle full open. Does the bike have a manual choke try to start with the throttle shut, choke off, then full on, then while continuing to turn over move the choke lever in stages from fully on to fully off. I find on my Yam TW125 (winter and bad weather hack) that if I have not used it for a while sharp twist the throttle a couple of times no more than a third of a turn. Hope this helps.

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This time of year, the ethanol in the fuel and winter set-up take their toll. Try this to entice it to run. Get an aerosol can of carburetor/choke cleaner spray at the auto parts store. Remove the air filter. Open the choke on the carburetor. Open the throttle all the way on the carburetor. Spray a couple of shots of the cleaner in through the carburetor throat. Immediately try to start the machine with it cold-choked the conventional manner with air cleaner still off. If it "pops" or acts like it wants to start, repeat the above procedure. If it fails to start, pull the spark plug and check for flooding and/or fouling of the plug. Clean and replace and repeat procedure. If it doesn't attempt to start, you will probably have to remove and service the carburetor, A good cleaning and/or gasket with diaphragms rebuild kit may need to be installed. These carbs have to be rebuilt with these fuel sensitive parts periodically anyway. Post back if needed. We are here to help.

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Two years ago i purchased a Craftsman riding mower with a Briggs&Stratton 24 hp inteck v-twin, it ran fine the first season but that was it. Last year i tried to get it started by changing plugs and...


Gas is so poorly refined these days, Youll notice the fuel stabilizer says it is only good for about 30 days. although i cant give specific instructions on how to clean out the clogged jet in your carb, if it runs on starting fluid, a clogged jet is deffinately your problem. start with the float bowl make sure it has clean fuel in it and the primary jet is usually in the bolt that holds the bowl on make sure its clean and if the float hanging down opens the needle valve and fuel flows your good to that point. if the engine still wont run, or only runs with the choke on. get some carb cleaner spray and go at it, make sure you can blow through every port and jet, BUT WATCH YOUR EYES you never know where that stuff is going to exit.

next year winterize it, drain the fuel and run it till it dies.
or i like to winterize my engines by replacing the regular fuel with a little bit of aviation fuel as that stuff can sit for years, just dont operate or mow for more than 2 or 3 minutes on it.

Good luck

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My 1994 Magna was running fine when I parked it for the winter. I started it one day, let it idle for about five minutes, and then tried to rev the engine. It sputtered and quit, and I haven't been able...


Motorcycle carbs seem to be particularly finicky about sitting through the winter, or for long periods of time period. More than likely when you let it idle for the 5 minutes you had the choke on? If so, the spark plugs possibly could have loaded up and fouled somewhat. Once a spark plug gets the least bit wet from fuel in a motorcycle they don't like to fire. One reason is that the starter takes such a drain on the electrical system and takes away from the ignition system somewhat.
I would suggest that along with making sure that your battery is fully charged that you install a new set of plugs. Also, it would not be a bad idea to put a good carb cleaner in the tank, possibly a little heavier than the directions call for, and also for the next few tanks of fuel.
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Ride safely, Ed

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1 Answer

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if it only runs w/choke on then your jets are plugged...fuel should have been drained before storage...time for carb clean i suspect...Tim

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