Question about 2004 Honda CRF 250 R

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I have an 04 CRF250R, with a new plug, fresh gas, and a fresh top end( good compression), but it won't start, any ideas?

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Ok check to make shure it is gettine the gas you can manualy spray a little gas in the carb and see if it starts that will let you know 2 things eather air to fuel flow mix isnt right or it isnt getting gas if it dosnt start then its the timeing

Posted on Jun 04, 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.
Kick starter Frozen stuck won budge Edit Brass in oil
Won start Kick start won even go down it like it stuck Banshee Repairs and...
Unsticking Stuck Engines
CRF250R service manual repair 2014 2017 CRF250 CRF 250R Download Manuals... $8 very cheap
http://www.partsfish.com/page/oem-parts-for-honda
Honda crf250r 2012 Owner Manual

May 04, 2017 | 2011 Honda CRF250X

3 Answers

I can not get my craftsman leaf blower to start. I put a new spark plug and fresh gas. Won't start.


Not to sure without seeing or hearing it being pulled over. Compression? Very likely needs some carb work/kit.

Apr 04, 2013 | Garden

1 Answer

Suzuki 650 savage won't start


dump all the old gas out, put in fresh stuff, sometimes you gotta change the spark plugs as well.
cheers bucky

Feb 20, 2013 | Suzuki Motorcycles

1 Answer

My MTD Yard machines riding mower won't start.


Probably dead gas from sitting too long. Dump it out & put in fresh gas.Could have moisture in it. Pull out spark plug & crank it over several times after putting gas & let it sit a while to dry out or blow it out with compressed air. It should go.

Apr 04, 2012 | Mtd Garden

1 Answer

2002 Honda CR 250 R lost all compression


Hi, Brandy for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. 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.
2001 CR250 Fresh top end no compression
2001 CR250 Fresh top end no compression
CR250 2002 2003 pdf
http://www.partsfish.com/page/oem-parts-for-honda
http://owners.honda.com/assets/ownerlink/model/own_man/powersports/2007/2007_cr250r.pdf

Mar 04, 2012 | 2002 Honda CR 250 R

1 Answer

My model TB46599, less than 1 year old, has no


Absolutely. What sometimes happens is that carbon will build up on the cylinder head. Then when you try and start it you get a mini backfire and it knocks the carbon loose. The carbon get mashed under one of the valves and then you end up with no compression.

Here are a couple of things you can do to try and loosen it up. (Mind you that you will have to change oil after this and probably need a new spark plug.)

1. In a well ventilated area... preferrably outside and off the grass or any vegitation area, remove the spark plug and turn the engine until the piston is all the way to the top. (TURN OFF THE FUEL SELECTOR)
2. Then dump about 3 cap fulls of oit into the cylinder head via spark plug hole. (Cap from 1 qt small mouth oil bottle)
3. Pull starter cord slowly 2 times.
4. Fill the cylinder all the way to the top of the cylinder head / spark plug hole. Keep it full for about 10 minutes. Add more gas if you have to. The goal here is to soak the overhead valve seat with raw gas for a bit.
5. After 10 minutes... YANK the starter cord with ign off knowing full well your going to make a mess.
6. Add Fresh gas to cyl head (not full this time) and YANK the cord again.
7. Keep pulling cord until vapor / gas cloud stops exiting spark plug hole.
8. Install spark plug and check compression.
Good compression... Good deal.. CHANGE THE OIL because it leaked past the pistions rings during the soaking process.

Still no compression the head will have to be removed and the vavle seats hand lapped with grinding compound.

NOTE: Before turning on the ignition switch... and attempting an engine start make sure that the unit is not soaked in gas i.e do a good clean up job.

Safety First!

Thanks for using FixYa.
Kelly

Apr 02, 2010 | Troy-Bilt 4-Cycle Curve Shaft Gas String...

1 Answer

Bought a 2002 Rm125 about 2 months ago, with a fresh top end....First ride was great with impressive power throughout. About two weeks later I noticed that it was missing some about half throttle , and...


My first thought is low compression... which leads to a few questions...
What fuel to oil ratio have you used?
What do you mean by 'fresh top end'? To me a fresh top end includes piston and rings and cylinder bore, gaskets and crank seals. Anything less on a 2-stroke is an incomplete job and usually leads to premature failure.
Have you followed break-in procedure on your fresh top end? Double check the head bolt torque.

Do a compression check first then go from there.

Dec 28, 2009 | Suzuki RM 125 Motorcycles

2 Answers

YZ125 won't start


yeah something you wanna check next, compression. if you can get your hands on a compression tester.

Aug 09, 2009 | Yamaha YZ 125 Motorcycles

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