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

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  • 2 Answers

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Posted on Jan 02, 2017

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  • 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.

Mar 12, 2016 | Garden

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.

Jan 10, 2016 | Tecumseh Garden

1 Answer

2010 Honda CRF450R wont start after running out of petrol


Hi, Anonymous if you have an old bike that has not had regular fuel system maintenance and you run the fuel tank dry I feel your pain. All the contaminants water-dirt-rust-liner paint flakes-ethanol sludge etc. that lived in the bottom of your fuel tank get mixed with the last few oz. of fuel left in the tank and enter the fuel system clogging up fuel filters-fuel valves-fuel lines-carburetor jets-needle jets and seats-fuel injectors etc. You fill up your fuel tank and guess what your bike does not start or if it does it runs like dog caca, a complete cleaning of the fuel system is mandatory, the procedure is as follows:
1. Drain the fuel tank and inspect the inside for leftover uninvited guests decontaminate as necessary for rusty environments install a liquid Fuel Liner.
2. In tank fuel pumps with external filters need to be cleaned.
3. Fuel valves need to be rebuilt with a new gasket kit.
4. Fuel lines need to be inspected for integrity and replaced as necessary any inline fuel filter should be cleaned or replaced.
5. Carburetors need to be disassembled then "DIPPED" and soaked in a commercial carb cleaning solution Gunk sells 1/2 gallon pails with meshed screen baskets. Reassemble using new rebuild kits. Record all jet sizes and float level for fine tuning.
6. Fuel injectors and fuel rails need to be properly cleaned and tested for optimum performance, if necessary send off any suspect injectors to "InjectorRx.com" for a modest fee they will refurbish the unit back to factory specs.
For more information about your issue and valuable "FREE" downloads that you will need for viewing and printing please click on the blue links below. Good luck and have a wonderful day.
2009 CRF 450 Won Start
09 crf450 wont start after cleaning fuel filter
Honda CRF450X 2005 Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CRF450R 2009 Owner Manual Competition Handbook

May 18, 2014 | 2010 Honda CRF450R

1 Answer

Lt1050 black smoke after 15 minutes


The black smoke and black spark plugs indicate that the engine is running very rich (ie too much fuel). This could be caused by the choke not opening fully after the engine starts and the fuel mixture is too rich OR the fuel mixture setting is opened too far.
Check the choke lever, make sure the choke is fully open when the choke is in the running position.
When the engine is running with the throttle is in the 3/4 rev position then adjust the fuel mixture to get the highest RPM.

Apr 19, 2012 | Cub Cadet Garden

1 Answer

Briggs as Stratton 6.75hp 190cc push mower by Craftsman (Crapsman!) will not run unless I hold the throttle open!


adjust air fuel mixture screw on main jet ,start about 1.5 turns out and slowly turn in till runs smooth

Mar 01, 2012 | Measuring Tools & Sensors

1 Answer

RBC30SET worked fine but having run ou of fuel now won't even turn over


hello sir, my machine will only start when pumping primmer bulb or squirting fluid in the carburetor than stops. the fuel line has broken off, in most small carburetors this is a ongoing problem.old fuel will crystallize when left in tank for a long time.plugging up ports, fuel lines, small screen in carburetor.fuel lines will dissolve clogging carb.this is why it will run when the choke is on creating a vacuum to where there is fuel forced in the carb to rum,also the gas will evaporate leaving the oil behind clogging up carb.the thing to do is remove carb. and clean out,replacing gaskets or fuel line if necessary.use carb cleaner to clean out carb.make sure to make note where fuel line go.the fuel filter broke off of fuel line letting debris get in carb plugging it up.the muffler is known to clog up a lot on these machines where they want run. the compression should be 60 to 120 lbs any thing below 60 is junk. when adjusting the carb screws turn in all the way than turnout 1 1/4 turns turn in slow until machine runs also you need to check for spark by removing plug and grounding against engine to check spark, ok.a new spark plug would be a good ideal too , if you are going to make these repairs use new fuel line and filter,hope this helps,any comments welcome,thank you, !!

Feb 19, 2012 | Garden

1 Answer

2010 HONDA CRF450R WILL NOT START


Hi, Mgmant and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the choke.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Quick disconnect check ball stuck.
14. Compression below 75 PSI.
15. A stuck-bent-burnt valve.
16. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
17. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
18. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
19. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections are loose or connected to the wrong cylinders.
20. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
21. Faulty neutral, clutch, kickstand safety switch.
22. Faulty fuel pump or fuse or relay.
23. Faulty or corroded run/stop switch.
24. Tilt sensor needs a reset.
25. Security system not disarming alarm needs a reset.
26. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
https://crfsonly.com/forum/viewtopic.php?t=39231
2010 450 Will not start
Honda CRF450X 2005 Service Manual
https://www.partsfish.com/page/oem-parts-for-honda
Honda 2009 CRF450X Owner Manual Competition Handbook

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2 Answers

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

Apr 22, 2011 | Briggs & Stratton Briggs Stratton Intek V...

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