Question about 2005 Honda CRF 250 R

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2007 crf250r wont start cold and starts within 3-4 kicks hot

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Pull the carb out and clean out the choke circuit,check that the slow speed jet is clear

Posted on Jul 05, 2009

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Hi there,my 2014 Honda crf250r just cut out on me and now the kick start is stuck frozen!or about 3 days before it happened i felt a dead spot when i was in fifth gear? Almost like i was losing power?


Hi, Graham you may have hydraulic lock caused by excessive liquid in the cylinder or you have squeaked your top end this is commonly known as "HEAT SEIZE" the piston heats up expands and becomes extremely tight in the cylinder bore and usually occurs mainly on 2 cycle engines right after a fresh top end rebuild, but it can also happen to brand new motorcycles, these are rare instances due to better quality control and education. Overheating failures that cause pistons to seize are many and each one should be carefully diagnosed to prevent future repeat offenders and the usual suspects are:
1. Lack of lubrication due to low or no oil.
2. Among the causes of lack of cylinder, lubrication is clogging of lubricator by dirt or waste, obstruction in oil pipes/lines, leaky check valves, leaky pump packing, broken oil pipe/line, oil too cold to feed.
3. Wrong type of oil used in premix or oil tank.
4. Improper premix ratio you should start with 32:1 as a baseline.
5. New rebuild piston to cylinder tolerances set up too tight.
6. Failure to follow proper break in procedures with a 16:1 premix ratio.
7. Loose fasteners causing intake, base, or head gaskets to leak or blown crankshaft seal, failure caused by age, overheating or walking. 8. Holes in the intake manifold bent or warped intake flange or reed cage any stray air coming into a cylinder will cause a super lean condition.
9. Improper assembly of reed valve gaskets.
10. Insufficient warm up time for temperature conditions before wide open throttle.
11. Broken, pinched or cracked fuel line.
12. Carburetor fuel passages clogged or restricted from stale fuel varnish, ethanol sludge, dirt, rust, or fuel level in float bowl too low.
13. Main jet size too small or partially clogged
14. Air filter improperly installed, missing or not sealing.
15. Faulty or improperly adjusted oil pump and or cable.
16. Failure to bleed oil pump after a rebuild/replacement or running oil tank dry.
17. Engine coolant level too low, too old, or improper mixture ratio.
18. Radiator clogged, fins damaged, or faulty cap.
19. No liquid circulation due to failed oil or water pump.
20. Cavitation due to air in oil or coolant system.
21. Water and oil mix due to blown head gasket.
22. Timing retarded due to faulty CKP sensor or CDI.
23. Improper spark plug heat range (too hot) and or gap.
24. Excessive engine load, brakes dragging, clutch slipping, transmission lubricant level too low or viscosity to high.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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CRF250R service manual repair 2014 2017 CRF250 CRF 250R Download Manuals... $8 very cheap
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Honda crf250r 2012 Owner Manual

May 04, 2017 | 2011 Honda CRF250X

1 Answer

My rmz 250 wont start on the first kick when the choke is on but when the engine is on and hot it starts first kick with no choke?????????


It takes a little suction for the gas to reach the cylinder from the carb. When it is hot and on, the gas is readily available. So a kick or two, when cold starting is not abnormal. Alternatively, kick twice with the key in off position. Then turn the key on and kick, the engine will start instantly. Idea is the make the gas reach the inlet.

Feb 13, 2010 | 2004 Suzuki RM-Z 250

3 Answers

Starting problem with honda crf250r 09 model when cod or hot


I have a honda crf250 2009 model i recently brought it off a mate. Had the same problem could not get the thing started. Missed races cause of this... I worked out how to get it started. On Cold start, turn the fuel on give the throttle 3 full pumps. Then do not touch it! Put ur hand in the middle of the handlebars if need be. Kick start the bike still may take a couple kicks but on mine its generally about 2-4 kicks. Then through out the day when u want to start it do no twist that throttle it just squirts fuel in and u may as well just pack it up!! I know this is what i have to do not saying yours will be the same but i hope it all works out!!!

Dec 13, 2009 | 1987 Honda Vf 1000 F

1 Answer

2007 honda crf 250 r hard starting when cold ,


There is a proper way to start an engine. Most bikes have four controls to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. Go ahead and give it another primer shot after the 5th kick attempt. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

Sep 23, 2009 | 2005 Honda CRF 250 R

1 Answer

2009 crf250r wont start when cold.


is ur batt healthy-must hav 12V at all times-cause its a coil ignition-is the regulator workin to charge it? carbs r a touchy thing-mite want to inspec low speed or idle jet-do u hav a manual*

Sep 01, 2009 | Honda CRF 250 R Motorcycles

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